Casco Specialty Windows are available in standard and custom sizes, with shape options designed to support unique architectural openings, design accents, and custom window layouts. Specialty windows are commonly used when a project needs a distinctive shape, additional daylight, a custom focal point, or a window configuration that goes beyond a standard rectangular operating unit.

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Built for custom openings and design flexibility. Casco Specialty Windows provide a choice of shapes for projects that need more than a standard window layout, helping homeowners, contractors, dealers, and architects create distinctive window designs for new construction, remodeling, replacement, and architectural projects.

Specialty Window Overview: Specialty windows are often selected for architectural detail, added daylight, accent openings, custom wall layouts, and projects where the window shape is part of the overall design. Casco Specialty Windows can be reviewed in standard and custom sizes to help suit the project opening and design concept.


Specialty Window Highlights

Custom Shapes

Specialty windows give projects more design flexibility by allowing shaped window openings that go beyond standard rectangular window layouts.

Design Accent

Specialty windows can be used as architectural accents, focal points, or supporting design elements in larger window groupings.

Project Flexibility

Specialty windows can be reviewed for standard and custom sizes, helping support remodel, replacement, new construction, and architect-specified projects.


Review Product Details

Features

Review specialty window construction, standard features, optional features, sizing, shapes, and product notes.

Shapes

Review available specialty window shapes, custom shape options, and design considerations.

Grilles

Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

Colors

Review exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

Glass

Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

Combinations

Review specialty windows used alone, paired with other units, or included in larger window layouts.

Resources

Download available product guides, size information, and supporting specialty window resources.

FAQ

Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.


Project Fit

Casco Specialty Windows are used for residential, light commercial, architect-specified, remodel, replacement, and new construction projects where the design calls for a custom shape, accent opening, added daylight, or a distinctive window layout.

Specialty window shape, unit size, glass package, grille pattern, exterior color, interior finish, installation method, and project energy requirements should be reviewed before ordering.

For shared aluminum-clad product details such as extruded aluminum cladding, Cardinal glass package selection, laminated glass, specialty privacy glass, interior finish options, and energy-code review, see the related tabs and FAQ section.

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  • Specialty Window Features

    Casco Specialty Windows are built for projects that need custom shapes, design flexibility, and aluminum-clad wood construction. Specialty windows can be reviewed in standard and custom sizes, with numerous shapes and mullion combinations available to support unique architectural openings, accent windows, and larger window layouts.

    Standard Features

    Review aluminum-clad construction, pine wood interior, custom sizing, shapes, glass, and NFRC certification.

    Optional Features

    Review upgraded glass, Estate Colors, grilles, interior finishes, extension jambs, and installation options.

    Design Notes

    Review shape, mullion, size, glass, grille, and design-assistance considerations.

    Product Details

    Jump to colors, glass, grilles, shapes, resources, and FAQ.

    Specialty Window Note: Specialty windows should be reviewed early in the project because the final shape, size, mullion layout, glass package, grille pattern, exterior color, interior finish, and installation details all affect the finished design.


    Standard Features

    Construction

    • Extruded aluminum-clad exterior with pine wood interior.
    • Solid wood component construction with substantial profiles.
    • Maximum amount of wood surface exposure to the interior of the home.
    • 4-9/16" jamb depth.
    • Position-lockable, fold-down vinyl nail fin for easy shipping and durable installation.

    Design, Glass & Certification

    • Numerous shapes and mullion combinations available.
    • Factory design assistance.
    • Custom size, made to order.
    • Eight standard exterior maintenance-free color options.
    • Cardinal LoE3-366® insulated glass with argon gas.
    • National Fenestration Rating Council (NFRC) Certified.


    Optional Features

    • Upgraded LoE coatings.
    • 22 Estate Colors and custom exterior color options.
    • Tempered and/or obscured glass.
    • Grille options including Grilles Between the Glass (GBG) and Simulated Divided Lites (SDL).
    • Factory stain, prime, or paint finishes including custom interior paint.
    • Factory-installed extension jambs.
    • Aluminum extruded brickmold or panning material, depending on product configuration.
    • Masonry installation straps in 7", 9", or 11" depths.


    Specialty Window Design Notes

    • Specialty windows are made to order and should be reviewed with the final project opening before ordering.
    • Shape, size, mullion layout, grille pattern, and glass selection should be reviewed together because each can affect the finished appearance.
    • Factory design assistance is available to help review specialty shapes and mullion combinations.
    • Exterior color, interior finish, glass package, and installation accessories should be coordinated with surrounding Casco aluminum-clad windows and doors.
    • Specialty window availability may depend on the requested shape, size, glass package, grille option, installation method, and final product review.
    NFRC Certified Casco specialty window Made in USA Casco product


    Product Detail Shortcuts

    Shapes

    Review available specialty window shapes, custom shape options, and design considerations.

    View Shapes

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    Resources

    Download available product guides, size information, and supporting specialty window resources.

    View Resources

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

  • Specialty Window Colors

    Casco Specialty Windows are available with standard exterior colors, Estate Colors, custom exterior color options, and interior prefinished wood colors. Color selection should be reviewed with the specialty window shape, glass package, grille pattern, mullion layout, surrounding window units, exterior materials, and interior finish requirements before ordering.

    Exterior Standard Colors

    Review standard aluminum-clad exterior color options.

    Estate Colors

    Review expanded exterior color options for design-focused projects.

    Interior Wood Colors

    Review interior prefinished wood color options.

    Selection Notes

    Review color sample, grille, glass, mullion, and project coordination notes.

    Color Note: Actual colors may vary. Physical color samples should be reviewed before final selection whenever color accuracy is important.


    Exterior Standard Colors

    Casco Specialty Windows are available in standard exterior aluminum-clad color options designed to coordinate with common exterior trim, siding, masonry, roofing, and surrounding window or door packages.

    White

    Vanilla

    Almond

    Beige

    Taupe

    Gunmetal

    Dark Bronze

    Black


    Exterior Estate Colors

    Estate Colors provide additional exterior color flexibility for projects requiring a more specific design match or expanded exterior color palette. Estate Colors are commonly reviewed for architect-specified projects, custom homes, specialty shapes, and coordinated aluminum-clad window packages.

    Bright White

    Chalk

    Glacier

    Platinum

    Cashmere

    Brownstone

    Khaki

    Mocha

    Musket

    Pebble

    Smoke

    Suede

    Wicker

    Heather

    Brick

    Sienna

    Olive

    Forest Green

    Spring Green

    Fern

    Teal

    Harbor

    Ice Blue

    Bronze Vein

    Silver Vein


    Interior Prefinished Wood Colors

    Interior prefinished wood colors are available for projects where a factory-finished pine interior is desired. Interior color should be reviewed with trim, casing, flooring, cabinetry, doors, and other interior finishes.

    Wheat

    Cinnamon

    Fruitwood

    Cherry

    Dark Oak

    Dark Walnut

    Mahogany

    Cordovan

    Ebony

    Black Cherry

    Mission Oak

    Painted Casco White

    Painted Casco Black

    Primed Only
    (Field Finish Required)


    Color Selection Notes

    • Exterior color should be reviewed with the home exterior, trim, siding, masonry, roofing, and surrounding Casco windows or doors.
    • Interior prefinished wood color should be reviewed with the room’s trim, casing, flooring, cabinetry, and interior design.
    • Specialty window shapes, mullion combinations, grille patterns, and surrounding window layouts should be reviewed together before final color selection.
    • Custom exterior color options may be reviewed when standard or Estate Colors do not meet the project requirements.
    • Physical color samples should be reviewed before final color approval.


    Product Detail Shortcuts

    Features

    Review specialty window construction, custom sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Shapes

    Review available specialty window shapes, custom shape options, and design considerations.

    View Shapes

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Resources

    Download available product guides, size information, and supporting specialty window resources.

    View Resources

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

  • Specialty Window Glass

    Casco Specialty Windows are available with multiple insulated glass, Low-E glass, tempered glass, obscure glass, laminated glass, and specialty glass options. Glass selection should be reviewed with the specialty window shape, size, grille pattern, mullion layout, project energy requirements, exterior exposure, privacy needs, and final product configuration before ordering.

    Glass Basics

    Review base clear insulated glass, Low-E options, and project energy requirement notes.

    LoE Glass Options

    Review LoE2-272, LoE3-366®, LoE3-340+, Quad LoE-452+, LoE-i89, and triple pane options.

    Obscure Glass

    Review obscure glass options for privacy while still allowing light into the room.

    Selection Notes

    Review glass coordination with shape, size, grilles, mullions, and energy requirements.

    Glass Selection Note: Specialty window glass should be reviewed with the requested shape, final size, mullion layout, grille pattern, project energy requirements, and installation location. Specialty shapes may require additional review before glass options are finalized.


    Glass Basics

    Base Glass Configuration

    The base glass configuration for Casco Specialty Windows should be reviewed with the selected product configuration and project requirements. Specialty windows can be reviewed with clear insulated glass and available Low-E glass packages depending on the final shape, size, glass requirements, and project application.

    When a project has a local energy code requirement or a specific U-factor, SHGC, or performance target, the required glass package should be reviewed before ordering.


    Glass Performance Terms

    • U-factor measures heat flow through the window assembly. A lower U-factor means better resistance to heat loss.
    • SHGC measures how much solar radiation enters as heat. A lower SHGC helps reduce solar heat gain.
    • Visible Transmittance measures how much visible light passes through the glass. A higher visible transmittance means more daylight.
    • UV transmission relates to fading protection. Lower UV transmission helps reduce fading potential for furniture, flooring, fabrics, artwork, and interior finishes.
    • Glare control reduces harsh visible light in direct sun conditions.
    • Privacy control can be handled through obscure glass when the project needs privacy while still allowing light into the room.


    LoE Glass Options


    Dual Pane LoE Glass Options

    Cardinal Quad LoE-452+ glass for Casco specialty windows

    Cardinal Neat+ naturally cleaner glass coating

    Quad LoE-452+ with Neat+ - Dual Pane

    Quad LoE-452+ is commonly reviewed when the project needs strong solar control, a neutral appearance, and useful visible light. It can be a good option for specialty windows in hot, sunny exposures where reducing solar heat gain is a priority.

    Neat+ is included as standard on Quad LoE-452+ glass. Neat+ is an exterior glass coating that helps the glass stay naturally cleaner and clean easier by using sunlight and rain to reduce dirt buildup.

    Common Use: Sunny exposures, larger specialty glass areas, high-light openings, and projects where solar control and a cleaner exterior glass surface are important.

    Cardinal LoE3-366 glass for Casco specialty windows

    LoE3-366® - Dual Pane

    LoE3-366® is commonly selected when the project needs a balanced high-performance Low-E option with strong energy performance, solar control, UV protection, and clear appearance.

    Common Use: All-around Low-E performance where the project needs energy performance while maintaining a clear appearance.

    Cardinal LoE2-272 glass for Casco specialty windows

    LoE2-272 - Dual Pane

    LoE2-272 is commonly reviewed when the project needs a practical Low-E glass option with good visible light, improved energy performance, and moderate solar control.

    Common Use: General specialty window applications where the project needs Low-E performance, clear appearance, and balanced visible light without moving to a stronger solar-control glass package.

    Cardinal LoE3-340+ glass for Casco specialty windows

    LoE3-340+ - Dual Pane

    LoE3-340+ is commonly selected where glare and solar heat gain are the main concerns. It is often used for direct sun exposures, hot exposures, and rooms where glare control matters.

    Common Use: Specialty window openings with stronger sun exposure where glare control and lower solar heat gain are priorities.

    Cardinal LoE-i89 glass for Casco specialty windows

    LoE-i89 Combinations - Dual Pane

    LoE-i89 is an interior surface coating used when additional U-factor improvement is needed. It reflects interior heat back into the room and is commonly selected for improved winter thermal performance, northern climates, and stricter U-factor requirements.

    Common Use: LoE3-366® with LoE-i89 or Quad LoE-452+ with LoE-i89 when the project needs both exterior solar control and improved interior-side thermal performance.


    Triple Pane LoE Glass Options

    Cardinal LoE3-366 with LoE-180 triple pane glass for Casco specialty windows

    LoE3-366® with LoE-180™ - Triple Pane

    Triple pane LoE3-366® with LoE-180™ is available when the project requires additional glass performance beyond standard dual pane configurations.

    Common Use: Specialty window applications requiring higher-performance glass packages or additional project review.


    Obscure Glass

    Privacy Glass Options

    Obscure glass is available for specialty windows. It is commonly used in bathrooms, mud rooms, utility areas, side yards, close neighboring conditions, and other locations where privacy is needed while still allowing light into the room.

    Obscure glass should be reviewed with the specialty window shape, size, glass package, grille pattern, and project requirements before ordering.

    Pattern62/Stipolite

    Rain

    Reeded Horizontal

    Reeded Vertical

    Satin Etch


    Glass Selection Notes

    • Specialty window glass should be reviewed with the final shape, size, mullion layout, and grille pattern.
    • LoE options are typically required when a project must meet a specific local energy code requirement or performance target.
    • Quad LoE-452+ with Neat+ is commonly used for strong solar control, neutral appearance, lower solar heat gain, fade protection, and naturally cleaner exterior glass.
    • LoE3-366® is commonly used for balanced energy performance and clear appearance.
    • LoE2-272 is commonly reviewed for balanced Low-E performance, good visible light, and moderate solar control.
    • LoE3-340+ is commonly used for direct sun and glare control.
    • LoE-i89 combinations are commonly used for improved winter thermal performance, northern climates, and lower U-factor requirements.
    • Triple pane LoE3-366® with LoE-180™ is available when the project requires additional glass performance beyond standard dual pane configurations.
    • Laminated glass may be reviewed when the project requires added safety, sound control, security considerations, impact resistance considerations, or project-specific glass requirements.
    • Tempered glass and obscure glass should be reviewed where required by location, code, privacy needs, or project design.
    • Glass availability may depend on the requested specialty shape, size, glass package, grille option, and final product review.


    Product Detail Shortcuts

    Features

    Review specialty window construction, custom sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    Shapes

    Review available specialty window shapes, custom shape options, and design considerations.

    View Shapes

    Resources

    Download available product guides, size information, and supporting specialty window resources.

    View Resources

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

  • Specialty Window Grilles

    Casco Specialty Windows are available with grille options that help shaped windows coordinate with surrounding aluminum-clad windows, exterior design details, interior finishes, and architectural requirements. Grille selection should be reviewed with the specialty window shape, size, glass package, mullion layout, exterior color, and interior finish before ordering.

    Internal Grilles

    Review grilles between the glass and two-tone finish information.

    SDL Grilles

    Review simulated divided lite grilles for a richer divided-light appearance.

    Grille Styles

    Review grille patterns and style options for specialty windows.

    Selection Notes

    Review grille coordination with shape, size, glass, mullions, and color.

    Grille Note: Specialty window grille layouts may need additional review because the final shape, size, radius, glass area, and mullion configuration can affect which grille patterns are practical for the finished unit.


    Internal Grilles

    Grilles Between the Glass

    Internal grilles are positioned between the two panes of insulating glass. This provides the visual appearance of divided lites while keeping the interior and exterior glass surfaces easier to clean.

    All internal grilles are available in two-tone finishes. The exterior color of the grille is matched to the window exterior color, and white is included on the interior side to coordinate with painted white interior finishes.

    Common Use: Specialty window projects where a grille pattern is desired with easier glass cleaning and a cleaner glass surface compared with applied grilles.

    5/8" Flat

    13/16" Flat

    3/4" Contour

    1" Contour


    SDL Grilles

    Simulated Divided Lite Grilles

    Simulated Divided Lite (SDL) grilles are mounted to the exterior surface of the glass on both the exterior and interior of the window. SDL grilles create a richer divided-light appearance compared with internal grilles alone.

    Adding a third internal grille between the glass can further enhance the look of SDL grilles by creating additional visual depth through the insulating glass unit.

    Common Use: Traditional, historic-style, architect-specified, or design-focused specialty window projects where a more authentic divided-lite appearance is desired.

    7/8" SDL

    7/8" SDL with Internal

    1-1/4" SDL

    1-1/4" SDL with Internal

    Interior Removable Wood Grilles: Interior removable wood grilles may also be reviewed for projects requiring that grille option. Availability should be confirmed with the selected specialty window shape, size, and final product configuration.


    Grille Styles

    Casco Specialty Windows are available with grille style options that can help shaped windows coordinate with surrounding casement, awning, double-hung, picture, and specialty window layouts. Grille style should be selected based on the architectural design, window shape, mullion layout, exterior appearance, and interior finish goals of the project.

    Colonial

    Specified Colonial

    Prairie

    Craftsman

    Cross

    Diamond

    Cathedral


    Grille Selection Notes

    • Internal grilles are positioned between the panes of insulating glass.
    • Internal grilles are available in two-tone finishes.
    • SDL grilles are mounted to the exterior and interior glass surfaces.
    • An internal grille between the glass can be added with SDL grilles for additional visual depth.
    • Interior removable wood grilles may be reviewed where available.
    • Specialty window shape, size, radius, mullion layout, and glass package should be reviewed before finalizing grille type or grille pattern.
    • Grille pattern should be coordinated with surrounding Casco aluminum-clad windows and doors when the specialty window is part of a larger window package.
    • Grille type, grille pattern, exterior color, interior finish, glass selection, and product configuration should be reviewed together before ordering.


    Product Detail Shortcuts

    Features

    Review specialty window construction, custom sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Shapes

    Review available specialty window shapes, custom shape options, and design considerations.

    View Shapes

    Resources

    Download available product guides, size information, and supporting specialty window resources.

    View Resources

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

  • Specialty Window Shapes & Combinations

    Casco Specialty Windows are available in multiple shapes and can be combined with other window units to support unique architectural openings, accent windows, custom wall layouts, and larger window designs. Shape and combination planning should be reviewed with the project opening, surrounding windows, mullion layout, grille pattern, glass package, exterior color, interior finish, and installation requirements before ordering.

    Shapes

    Review available Casco Specialty Window shapes.

    Combinations

    Review specialty windows used with other window units and larger layouts.

    Design Review

    Review shape, size, mullion, grille, glass, and installation considerations.

    Product Details

    Jump to features, colors, glass, grilles, resources, and FAQ.

    Specialty Shape Note: Specialty windows are made to support unique design concepts, but the final shape, size, glass package, grille pattern, mullion layout, and installation method should be reviewed before ordering. If the desired shape is not shown, Casco can help review the project requirement.


    Specialty Window Shapes

    Available Specialty Window Shapes

    Below are available Casco Specialty Window shapes. Specialty shapes can help support architectural accents, custom wall openings, unique elevation details, and window layouts that require more than a standard rectangular unit.

    Shape availability should be reviewed with the requested size, glass package, grille pattern, mullion layout, exterior color, interior finish, and project requirements.

    Half Round

    Extended Leg Segment

    Extended Leg Segment - LH

    Extended Leg Segment - RH

    Circle

    Octagon

    Quarter Round - RH

    Segment

    Trapezoid - LH

    Trapezoid - RH

    Triangle - LH

    Triangle - RH

    Equal Leg Triangle

    Oval

    Cathedral Head

    Ellipse

    Pentoid

    Extended Leg Half Round

    Extended Leg Ellipse

    Quarter Round - LH

    Rectangle

    Extended Leg Half Round - LH

    Extended Leg Half Round - RH

    Need a different shape? If the shape you are looking for is not shown, contact Casco so the project can be reviewed. Factory design assistance is available for specialty shapes and mullion combinations.


    Specialty Window Combinations

    Combined Window Layouts

    Specialty windows can be combined in many different ways and with other windows to create the design aesthetic desired. They can be used as accent units, focal points, transom-style elements, gable shapes, arched features, or supporting units within larger window groupings.

    Combination layouts should be reviewed with surrounding window types, mullion requirements, glass selection, grille alignment, exterior color, interior finish, installation method, and project energy requirements.

    Two arched segments make one large half round window. This can also be achieved as one large window. No grille shown.

    Three arched segments specialty windows create one large arched window combination. Cathedral grille shown.

    One arched specialty window is shown as a transom over a casement window combination. Craftsman grille pattern shown in the lower casement windows and specified colonial grille pattern in the specialty window.

    Three specialty windows are shown over double hungs and a double hung picture window combination. No grille shown.

    Three specialty windows are shown over double hungs and a double hung picture window combination. No grille shown.


    Design Review Notes

    • Specialty window shape should be reviewed with the final project opening before ordering.
    • Custom sizes and specialty shapes may require additional design review.
    • Mullion combinations should be reviewed with the surrounding window layout and wall opening.
    • Grille patterns may need to be adjusted depending on the specialty window shape, radius, glass area, and overall design.
    • Glass package availability may depend on the shape, size, grille option, and final product configuration.
    • Exterior color, interior finish, and grille color should be coordinated with surrounding Casco aluminum-clad windows and doors.
    • Installation accessories, jamb requirements, brickmold, panning, masonry straps, and field conditions should be reviewed before ordering.
    • Factory design assistance is available to help review specialty shapes and mullion combinations.


    Common Specialty Window Applications

    Architectural Accents

    Specialty windows can be used as accent openings that add shape, daylight, and visual interest to an elevation or room.

    Larger Window Layouts

    Specialty windows can be combined with other window units to create larger glass layouts, shaped groupings, and more distinctive wall designs.

    Custom Project Openings

    Specialty windows can help support custom openings where the design calls for a shape, size, or layout that goes beyond a standard rectangular window.


    Product Detail Shortcuts

    Features

    Review specialty window construction, custom sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    Resources

    Download available product guides, size information, and supporting specialty window resources.

    View Resources

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

  • Specialty Window FAQ

    Casco Specialty Windows are custom, non-operating, direct-set aluminum-clad wood windows for homeowners, contractors, dealers, lumberyards, architects, and project teams looking for durable, energy-efficient, made-to-order shaped windows with strong exterior protection and design flexibility. This FAQ focuses first on specialty-window-specific questions, including direct-set construction, made-to-order sizing, shape review, factory mulling, quoting basics, grille options, glass limits, accessory limits, and project planning. Shared aluminum-clad product information, including cladding construction, glass package selection, energy requirements, grilles, interior finish options, and related Casco aluminum-clad product details, is grouped near the bottom because that information repeats across the aluminum-clad product line.

    Homeowners

    Add daylight, architectural detail, custom shapes, and exterior protection with made-to-order specialty windows.

    Contractors

    Support replacement, remodel, new construction, custom openings, and factory-mulled window layouts.

    Dealers & Lumberyards

    Source made-to-order aluminum-clad specialty windows for residential and light commercial projects.

    Architects

    Review specialty windows for custom shapes, gables, transoms, stairwells, feature windows, grilles, glass, and finish requirements.

    Quick Summary: Casco Specialty Windows are non-operating, direct-set windows made with heavy-duty extruded aluminum-clad exteriors, not roll-form aluminum or vinyl cladding, along with pine wood interiors, Cardinal LoE3-366® insulated glass with argon gas, optional glass upgrades, grille options, color flexibility, factory design assistance, NFRC-certified performance, and factory mulling capability where applicable. All Casco Specialty Windows are made to order; standard sizes are not available. Specialty Windows are not intended for ventilation or emergency egress openings. Final availability depends on the requested shape, overall width, overall height, leg height, glass package, grille pattern, mullion layout, installation method, accessory requirements, and final Casco review.

    Browse FAQ Topics


    Specialty Window Basics

    What is a Casco Specialty Window?

    A Casco Specialty Window is a custom-shaped, non-operating direct-set aluminum-clad wood window. Specialty Windows are used when a project needs a unique shape, architectural accent, gable window, transom, stairwell window, feature window, or companion unit above or beside another Casco aluminum-clad window.

    Are Casco Specialty Windows operating windows?

    No. Casco Specialty Windows are non-operating, direct-set windows. They are designed to provide daylight, shape, design detail, and architectural interest, but they do not open for ventilation.

    Are Specialty Windows intended for ventilation?

    No. Specialty Windows are fixed, direct-set units and are not intended for ventilation. For operating ventilation, review Casco aluminum-clad casement windows, awning windows, double-hung windows, or patio doors depending on the project need.

    Can Specialty Windows be used for emergency egress openings?

    No. Since Casco Specialty Windows are non-operating direct-set units, they are not intended for emergency egress openings. Egress requirements should be reviewed with the project designer, contractor, architect, builder, code official, or local authority before ordering any window for an egress location.

    Do Specialty Windows include screens or operating hardware?

    No. Casco Specialty Windows are non-operating direct-set windows, so they do not include operating hardware or screens.


    Direct-Set Construction and Product Use

    What does direct-set mean?

    Direct-set means the glass is set directly into the window frame instead of being installed into an operating sash. This allows the unit to function as a fixed, non-operating specialty window for shaped openings and custom design applications.

    Why choose a direct-set Specialty Window?

    Direct-set Specialty Windows are often selected when the project needs a custom shape, fixed glass area, added daylight, architectural detail, or a companion window that coordinates with surrounding Casco aluminum-clad products.

    Where are Specialty Windows commonly used?

    Specialty Windows are commonly used as architectural accents, gable windows, transoms, stairwell windows, feature windows, shaped openings, and companion units above or beside other Casco aluminum-clad windows.


    Sizing, Quoting, and Made-to-Order Review

    Are standard sizes available for Casco Specialty Windows?

    No. All Casco Specialty Windows are made to order. Standard sizes are not available.

    What information is needed to quote a Specialty Window?

    The basic information needed for most Specialty Window quotes is the overall width, overall height, and any required leg height. A radius is not usually needed unless the customer already knows the radius or needs the unit to match a specific field condition or architect-specified dimension.

    It is also helpful to include the requested shape, glass type, grille pattern, exterior color, interior finish, jamb requirement, extension jamb requirement, and whether the unit will be factory mulled with other Casco windows.

    Should dimensions be labeled when requesting a quote?

    Yes. Dimensions should be clearly labeled as unit size, rough opening size, masonry opening size, or existing visible glass/opening size. This helps avoid confusion during quoting, design review, and order entry.

    Are drawings or templates needed?

    For unusual shapes, complex openings, replacement conditions, architect-specified dimensions, or custom design requirements, Casco may need drawings, dimensions, templates, or factory design review before the unit can be quoted or approved.

    How large can a Casco Specialty Window be?

    Casco Specialty Window size limits depend heavily on the dual-pane insulated glass package required for the selected shape and configuration. Because Specialty Windows are non-operating direct-set units, the finished window cannot exceed the practical size limits of the glass package that can be supplied for that unit.

    As a practical maximum guide, Casco uses 5.7 mm glass size limits for Specialty Window review. Cardinal’s IG size guidance lists 5.7 mm glass at a maximum of 50 sq. ft. for annealed glass and 60 sq. ft. for heat-strengthened or tempered glass. The same guidance lists a 120" maximum length for 5.7 mm annealed glass and a 144" maximum length with a 72" maximum short-side dimension for 5.7 mm heat-strengthened or tempered glass.

    These are glass size guidelines, not automatic Casco finished-window size approvals. Final availability depends on the requested shape, overall width, overall height, leg height, glass thickness, coating option, tempered glass requirements, grille layout, windload requirements, production limitations, and final Casco review.

    Can large Specialty Windows require tempered glass or thicker glass?

    Yes. Large Specialty Windows may require tempered glass, heat-strengthened glass, thicker glass, or additional review based on size, shape, location, code requirements, windload requirements, production limitations, or factory review. This may be required even when the customer did not originally request tempered glass.


    Shapes, Combinations, and Factory Mulling

    What shapes are available?

    Casco offers a gallery of available Specialty Window shapes. Shape availability should be reviewed with the final size, glass package, grille pattern, mullion layout, and project requirements.

    For examples, review the Shapes section.

    What if the shape needed for the project is not shown?

    Contact Casco for review. Some specialty shapes may require additional drawings, dimensions, templates, or factory design assistance before quoting or approval.

    Can Specialty Windows be combined with other Casco windows?

    Yes. Specialty Windows can be combined with other Casco aluminum-clad windows to create the design aesthetic desired. They can be used as accent units, shaped transoms, gable units, feature windows, or companion units within larger window layouts.

    Can Specialty Windows be factory mulled?

    Yes. Casco Specialty Windows can be factory mulled with other Casco aluminum-clad windows where the selected shape, size, layout, mullion condition, and product configuration allow. Factory mulling should be reviewed before quoting and ordering.

    Can Specialty Windows be used as transoms?

    Yes. Specialty Windows can be used as fixed transom-style units above other Casco aluminum-clad windows. Because they are non-operating direct-set units, they add shape and daylight but do not provide ventilation.


    Glass, Energy, and Performance

    What glass comes standard in Casco Specialty Windows?

    Casco Specialty Windows use Cardinal LoE3-366® insulated glass with argon gas as the standard glass package.

    What upgraded glass options are available?

    Upgraded LoE coatings, tempered glass, obscured glass, laminated glass, and other specialty glass options may be reviewed where applicable. Final availability depends on the requested shape, size, glass package, grille layout, production requirements, and project review.

    For glass details, review the Glass section.

    Are CLiC switchable privacy glass and blinds-between-glass available?

    CLiC switchable privacy glass and blinds-between-glass are only available on some rectangular Specialty Window units, depending on overall size and final review. They are not available on shaped Specialty Window units. Inquire for additional details when a rectangular direct-set unit requires either of these options.

    Are Specialty Windows NFRC certified?

    Yes. Casco Specialty Windows are National Fenestration Rating Council (NFRC) certified. NFRC certification supports performance documentation for homeowners, contractors, dealers, architects, and project teams reviewing U-factor, solar heat gain, visible transmittance, and related performance data. Final performance values depend on the selected shape, size, glass package, grille option, and overall unit configuration.

    Who is responsible for confirming project energy requirements?

    Customers, dealers, contractors, architects, builders, and project teams are responsible for reviewing the project energy requirements before purchasing Casco aluminum-clad windows. Requirements can vary by location, building code, project type, glass package, unit configuration, orientation, and overall project design.

    Casco provides available product configurations, glass options, NFRC-certified performance information, and supporting product documentation. The project team must confirm that the selected window type, glass package, grille option, unit configuration, and overall product selection meet the applicable energy requirements before ordering.

    Do Specialty Windows meet all energy-code requirements automatically?

    No. Energy requirements vary by project location, building code, unit configuration, glass package, grille option, and overall design. Before purchasing, the customer, dealer, contractor, architect, builder, or project team must review the applicable energy requirements and select the product configuration needed to meet those requirements.


    Grilles and Design Details

    What grille options are available for Specialty Windows?

    Casco Specialty Windows can be reviewed with Grilles Between the Glass (GBG), Simulated Divided Lites (SDL), and interior removable wood grilles where applicable. Final availability depends on the selected shape, size, glass layout, grille pattern, and factory review.

    For grille details, review the Grilles section.

    Can shaped windows have the same grille pattern as surrounding windows?

    In many cases, grille patterns can be coordinated with surrounding Casco aluminum-clad windows, but specialty shapes may require grille pattern adjustments. Shape, radius, leg height, glass area, mullion layout, and final product configuration should be reviewed before ordering.

    Are internal grilles available in two-tone finishes?

    Yes. Internal grilles are available in two-tone finishes. The exterior color of the grille is matched to the window exterior color, and white is included on the interior side to coordinate with painted white interior finishes.


    Installation, Jambs, and Accessories

    Can Casco Specialty Windows be used for replacement projects?

    Yes. Casco Specialty Windows are available for replacement projects. Replacement conditions should be reviewed carefully because the existing opening, shape, dimensions, field conditions, exterior trim, interior trim, jamb requirements, and installation method can affect the final product configuration.

    Can Casco Specialty Windows be used for remodel and new construction projects?

    Yes. Casco Specialty Windows can be used for remodel and new construction projects where the design calls for a custom shape, added daylight, architectural accent, gable window, transom, stairwell window, or companion unit within a larger Casco aluminum-clad window package.

    What jamb depth is standard?

    Casco Specialty Windows use a 4-9/16" jamb depth as standard.

    Are extension jambs available?

    Yes. Factory-installed extension jambs are available and should be reviewed with the wall depth, interior finish, trim requirements, and installation method before ordering.

    Are exterior perimeter accessories available?

    Exterior perimeter accessories, such as aluminum brickmold or panning, are not available for curved Specialty Window units. They may be available for shaped straight-line units such as trapezoids, octagons, hexagons, and similar shapes. Final availability depends on the selected shape, size, accessory requirement, and factory review.

    Are masonry straps available?

    Masonry installation straps may be reviewed in 7", 9", or 11" depths where applicable. Installation accessories should be reviewed with the selected shape, wall condition, project opening, and installation method before ordering.


    Projects, Architects, and Larger Window Layouts

    Are Specialty Windows good for architect-specified projects?

    Yes. Specialty Windows are a strong option for architect-specified projects that require custom shapes, made-to-order sizing, extruded aluminum-clad exterior construction, pine wood interiors, Cardinal glass options, grille coordination, NFRC certification, and factory design review.

    Architects and project teams can also review Casco’s Architect-Specified Windows & Doors page for related product options and specification-focused information.

    Are Specialty Windows good for larger glass openings?

    Yes. Specialty Windows can be used with other Casco aluminum-clad windows to create larger glass layouts, shaped window groupings, transom-style elements, gable features, and architectural focal points. Larger glass openings should be reviewed with glass size limits, glass thickness, safety glass requirements, grille layout, windload requirements, and final factory review.

    Can Specialty Windows be used in historic or traditional-style projects?

    Yes. Specialty Windows may be reviewed for historic, traditional-style, and architecturally sensitive projects where a shaped, fixed, direct-set window is needed. Historic review should consider the existing opening, exterior sightlines, grille pattern, color, interior finish, shape, size, local review requirements, and whether the project is replacing a full unit or matching an existing condition.

    For broader planning, review Casco’s Historic Home Solutions page.


    Dealers, Lumberyards, Resources, and Related Products

    Can dealers and lumberyards source Casco Specialty Windows?

    Yes. Dealers and lumberyards can quote Casco Specialty Windows for homeowners, contractors, remodelers, builders, architects, and project buyers. Because every Specialty Window is made to order, accurate dimensions and project details are important before quoting.

    What information helps with quoting Specialty Windows?

    Helpful quoting information includes quantity, shape, overall width, overall height, leg height when applicable, whether dimensions are unit size or opening size, glass package, tempered glass requirements, laminated glass requirements, obscure glass requirements, CLiC or blinds-between-glass request for qualifying rectangular units, grille option, exterior color, interior finish, jamb requirements, extension jamb needs, exterior accessory needs, factory mulling needs, delivery location, and project schedule.

    What related Casco products should be reviewed?


    Shared Aluminum-Clad Product Information

    Shared Product Note: The sections below cover aluminum-clad product details that repeat across Casco’s aluminum-clad product line, including extruded aluminum cladding, wood interiors, finish options, Cardinal glass packages, energy-code review, specialty glass, laminated glass, grille coordination, and project planning.

    What is an aluminum-clad wood window?

    An aluminum-clad wood window uses aluminum on the exterior and wood on the interior. Casco aluminum-clad products use heavy-duty extruded aluminum cladding on the exterior, not roll-form aluminum or vinyl cladding. The extruded aluminum-clad exterior helps protect the outside of the window from weather exposure, while the wood interior provides a traditional appearance and finish flexibility inside the home.

    This aluminum-clad section applies broadly across Casco aluminum-clad window and patio door product lines.

    Why choose aluminum-clad windows?

    Aluminum-clad windows are selected when a project needs exterior durability and interior wood appearance. The aluminum exterior reduces exterior maintenance compared with exposed wood, while the pine interior provides a warmer interior appearance that can coordinate with trim, cabinetry, flooring, doors, and other interior finishes.

    What exterior colors are available?

    Casco Specialty Windows are available with standard exterior colors, 22 Estate Colors, and custom exterior color options. Physical color samples should be reviewed before final color approval whenever color accuracy is important.

    For current color galleries, review the Colors section.

    What interior finish options are available?

    Factory stain, prime, or paint finishes are available, including custom interior paint. Interior prefinished wood colors are also available for projects requiring a factory-finished pine interior.

    Can Specialty Windows coordinate with other Casco products?

    Yes. Casco Specialty Windows can coordinate with other Casco aluminum-clad products, including casement windows, awning windows, double-hung windows, patio doors, and other compatible aluminum-clad window configurations.


    Extruded Aluminum Cladding Compared with Roll-Form and Vinyl Cladding

    Do Casco Specialty Windows use extruded aluminum?

    Yes. Casco Specialty Windows use extruded aluminum cladding. Casco does not use roll-form aluminum cladding or vinyl cladding on its aluminum-clad product line.

    Extruded aluminum is a heavier-duty exterior cladding system that is formed through an extrusion die, creating a stronger and more substantial profile than thin roll-form cladding or vinyl exterior cladding.

    What is the difference between extruded aluminum cladding and roll-form aluminum cladding?

    Extruded aluminum cladding is made from a solid aluminum profile shaped through an extrusion process. This creates a rigid, substantial exterior component with more strength, better profile definition, and a heavier-duty feel.

    Roll-form aluminum cladding is typically made from thinner aluminum sheet material that is bent or formed around the exterior of the window. Roll-form cladding can provide an aluminum exterior surface, but it is generally a lighter-duty cladding approach compared with extruded aluminum.

    For customers comparing similarly priced aluminum-clad windows, the cladding method matters. A window with extruded aluminum cladding is not the same construction level as a window using thin roll-form cladding.

    What is the difference between extruded aluminum cladding and vinyl cladding?

    Extruded aluminum cladding provides a durable metal exterior over the wood window. It is used when the project requires a more substantial exterior cladding system with a clean finish, strong profile shape, and long-term exterior durability.

    Vinyl cladding uses a vinyl exterior surface instead of aluminum. Vinyl cladding can reduce exterior maintenance compared with exposed wood, but it does not provide the same heavy-duty aluminum exterior construction as extruded aluminum cladding.

    Casco aluminum-clad windows are built for customers who want the strength and appearance of aluminum on the exterior with the warmth and finish flexibility of wood on the interior.

    Why does extruded aluminum cladding matter?

    Extruded aluminum cladding matters because it creates a stronger, more rigid exterior profile than roll-form or vinyl cladding. This helps support a cleaner exterior appearance, better cladding definition, durable corners and profiles, and a more substantial product feel.

    When comparing Casco aluminum-clad windows against other products with similar or equal pricing, customers should confirm whether the competing window uses extruded aluminum cladding, roll-form aluminum cladding, or vinyl cladding. Products may look similar at a glance, but the exterior cladding construction can be very different.


    Shared Glass, Energy, and Specialty Glass Details

    How should customers choose between LoE3-366®, LoE3-340+, Quad LoE-452+, and LoE-i89 combinations?

    The correct glass configuration depends on the project energy requirements, climate zone, sun exposure, room use, visible light goals, solar heat gain goals, and required NFRC performance. LoE glass options may be needed when the project must meet a specific local energy code requirement or performance target.

    LoE3-366® is the standard glass package for Casco Specialty Windows and is commonly used as a balanced high-performance Low-E option when the project needs improved energy performance, solar control, UV protection, and clear visibility.

    LoE3-340+ is used when greater glare control and lower solar heat gain are needed, especially for direct sun exposures.

    Quad LoE-452+ is available when the project needs strong solar control with a clear, neutral appearance.

    LoE-i89 is an interior surface coating used when additional U-factor improvement is needed.

    LoE3-366® with LoE-i89 and Quad LoE-452+ with LoE-i89 are reviewed when the project needs both exterior solar control and additional interior-side thermal performance.

    The customer, dealer, contractor, architect, builder, or project team must confirm which glass package is required before ordering. Casco provides available glass options and product performance documentation, but the project team is responsible for selecting the product configuration that meets the applicable project energy requirements.

    What does each glass performance term mean?

    U-factor measures heat flow through the window assembly. A lower U-factor means better resistance to heat loss. This is often important in cold climates and energy-code-driven projects.

    Solar Heat Gain Coefficient (SHGC) measures how much solar radiation enters as heat. A lower SHGC helps reduce solar heat gain and is often important in hot, sunny climates or high-sun exposures.

    Visible Transmittance (VT) measures how much visible light passes through the glass. A higher visible transmittance means more daylight.

    UV transmission relates to fading protection. Lower UV transmission helps reduce fading potential for furniture, flooring, fabrics, artwork, and interior finishes.

    Laminated glass uses an interlayer between glass layers and is commonly reviewed for added safety, sound control, security considerations, impact resistance considerations, or project-specific glass requirements.

    Privacy control can be handled through obscure glass, CLiC switchable privacy glass on some rectangular direct-set units, or blinds-between-glass on some rectangular direct-set units, depending on whether the project needs permanent privacy, on-demand privacy, or integrated blind operation. CLiC and blinds-between-glass are not available on shaped Specialty Window units.

    Glare control reduces the intensity of visible light in direct sun conditions. This is useful for high-sun exposures, rooms with screens or televisions, commercial spaces, and areas where harsh daylight is a concern.

    Which glass option should be used for a specific customer need?

    For balanced energy performance and clear appearance: LoE3-366® is the standard glass package for Casco Specialty Windows and is commonly selected when the project needs a strong all-around Low-E option.

    For direct sun and glare control: LoE3-340+ is commonly selected where glare and solar heat gain are the main concerns.

    For strong solar control with a clearer neutral appearance than heavy glare-control glass: Quad LoE-452+ is commonly selected for hot, sunny exposures where reducing solar heat gain is a priority while still maintaining useful visible light.

    For improved winter thermal performance, northern climates, and lower U-factor requirements: LoE-i89 combinations are commonly selected when the project needs stronger interior-side heat retention or must meet stricter U-factor requirements.

    For laminated glass requirements: laminated glass may be reviewed with the appropriate Cardinal LoE glass option when the project needs laminated glass for safety, sound control, security considerations, impact resistance considerations, or project-specific requirements.

    For permanent privacy: obscure glass is available where the project needs privacy while still allowing light into the room.

    For on-demand privacy or integrated blinds: CLiC switchable privacy glass and blinds-between-glass are only available on some rectangular Specialty Window units, depending on overall size and final review. They are not available on shaped Specialty Window units.

    For projects with specific local energy requirements: the glass package must be selected based on the required U-factor, SHGC, VT, climate zone, code path, unit configuration, and supporting NFRC performance information before ordering.

    Is obscure glass available for Specialty Windows?

    Yes. Obscure glass is available for Specialty Windows. It is commonly used in bathrooms, mud rooms, utility areas, side yards, close neighboring conditions, and other locations where privacy is needed while still allowing light into the room.

    Is laminated glass available?

    Yes. Laminated glass may be reviewed for Casco Specialty Windows where the selected shape, size, glass package, and project requirements allow. Laminated glass is commonly reviewed when the project requires added safety, sound control, security considerations, impact resistance considerations, or project-specific glass requirements.


    Why Choose Casco Specialty Windows?

    Casco Specialty Windows provide made-to-order, non-operating direct-set window solutions for custom shapes, architectural accents, gable openings, transoms, stairwell windows, feature windows, and companion units within larger Casco aluminum-clad window layouts.

    They combine heavy-duty extruded aluminum-clad exterior protection, not roll-form or vinyl cladding, pine wood interiors, Cardinal LoE3-366® insulated glass with argon gas, optional glass upgrades, grille options, color flexibility, factory design assistance, NFRC certification, and factory mulling capability where applicable.

    Because every Specialty Window is made to order, final availability depends on the requested shape, size, glass package, grille pattern, mulling layout, accessory requirement, installation method, and final Casco review.

    When comparing similarly priced products, customers should confirm whether the exterior is heavy-duty extruded aluminum, thinner roll-form aluminum, or vinyl cladding.

    Additional planning resources include the Casco Aluminum-Clad Window & Patio Door Guide, the Specialty Window Shapes section, the Glass section, the Grilles section, and related Casco solutions including Architect-Specified Windows & Doors and Historic Home Solutions.


    Product Detail Shortcuts

    Features

    Review specialty window construction, made-to-order sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Shapes

    Review available specialty window shapes and examples of specialty windows combined with other units.

    View Shapes

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    Resources

    Download available product guides and supporting specialty window resources.

    View Resources

  • Specialty Window Resources

    Use these resources to review Casco aluminum-clad window and patio door information, specialty window planning considerations, and supporting product details. Specialty windows are made to order and should be reviewed with the final shape, size, glass package, grille pattern, exterior color, interior finish, mullion layout, and installation requirements before ordering.

    Important Specialty Window Note: All Casco Specialty Windows are made to order. Standard sizes are not available.


    Downloadable Resources

    Casco Aluminum-Clad Window and Patio Door Guide

    Casco Aluminum-Clad Window & Patio Door Guide

    Review Casco aluminum-clad window and patio door information, product details, available options, and supporting information for specialty window planning.

    Download Guide


    Specialty Window Planning Notes

    • All Casco Specialty Windows are made to order.
    • Standard specialty window sizes are not available.
    • Final shape, size, mullion layout, and glass package should be reviewed before ordering.
    • Grille patterns may need additional review depending on the specialty window shape and glass area.
    • Exterior color, interior finish, grille color, and surrounding window units should be coordinated together.
    • Installation requirements should be reviewed with the project opening, jamb needs, brickmold or panning requirements, and field conditions.
    • Factory design assistance is available for specialty shapes and mullion combinations.


    Related Product Details

    Features

    Review specialty window construction, made-to-order sizing, shapes, mullion combinations, glass, and NFRC certification.

    View Features

    Shapes & Combinations

    Review available specialty window shapes and examples of specialty windows combined with other units.

    View Shapes

    Glass

    Review glass packages, energy-code considerations, privacy glass, laminated glass, and specialty glass options.

    View Glass

    Colors

    Review standard exterior colors, Estate Colors, custom exterior colors, and interior prefinished wood colors.

    View Colors

    Grilles

    Review internal grilles, simulated divided lite grilles, removable wood grilles, and grille pattern considerations.

    View Grilles

    FAQ

    Review specialty window questions first, with shared aluminum-clad product information grouped near the bottom.

    View FAQ

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