| Double Hung Replacement Kit

Feature Note: Double-Hung Replacement Kits are not full window units. They are sash-pack replacement systems intended for compatible existing wood double-hung frames. The existing frame, sill, trim, opening condition, and installation conditions must be reviewed before ordering.

• New aluminum-clad upper and lower replacement sashes.
• Pine wood interior sash surfaces.
• Clear insulated glass as the base glass configuration.
• Replacement-style compression jamb liners.
• Cam-action sash lock.
• New vinyl head parting stop.
• Installation clips and fasteners.
• Applicable insulating glass warranty coverage.

• A new full window frame is not supplied.
• Exterior casing, sill, stool, apron, trim, and existing frame repairs are not included.
• Field measuring, field verification, removal of existing components, installation labor, finishing labor, and final fit adjustments are not included.
• Screens are not included as a standard kit component. Made-to-order replacement screens may be reviewed when needed.
• Storm windows are separate products and are not included with the replacement kit.

• Double-Hung Replacement Kits are intended for compatible existing wood double-hung frames.
• The existing frame remains in place and must be suitable for reuse.
• The ordering party and installer are responsible for confirming measurements, frame condition, opening condition, installation method, and final fit.
• Clear insulated glass is the base glass configuration.
• LoĒ glass packages are available when the project needs improved glass performance, lower U-factor, solar control, glare control, UV protection, or other project-specific performance improvements.
• Because the kit is installed into an existing frame, the installed performance depends on the existing frame condition, installation quality, and field conditions.
• For complete window-unit replacement, review Casco Aluminum-Clad Double-Hung Windows.
• For related sash-only casement, awning, or picture window applications, review Casco Replacement Casement Sashes.
• For added sound reduction, exterior protection, or a secondary window layer, review Casco Aluminum Storm Windows.

Glass Selection Note: The base glass configuration is clear insulated glass. LoĒ glass packages are available when the project needs improved glass performance, solar control, lower U-factor, glare control, or other project-specific glass performance. Casco Double-Hung Replacement Kits are sash-pack components installed into existing frames and are not rated fenestration products or full window units. Because they are replacement parts rather than complete rated window assemblies, they are typically not required to meet the same energy-code requirements as a new rated fenestration product. However, code requirements vary by project and location, and confirmation should be made with the local governing code enforcement authority where required. Glass ratings and glass performance information may be used to assist with glass selection, but glass ratings are not the same as a complete window product rating. The customer, dealer, contractor, architect, builder, or project team is responsible for confirming the selected glass package and replacement kit approach before ordering.

Base Glass Configuration

The base glass configuration for Casco Double-Hung Replacement Kits is clear insulated glass. This base configuration may be used when the project does not require a specific Low-E package and the applicable energy requirements allow it.

Clear glass allows strong visible light, but it does not provide the same solar control, UV protection, or U-factor performance as LoĒ glass packages. When a project has a local energy code requirement or a specific U-factor, SHGC, or performance target, a LoĒ glass package may be reviewed.

• Double-Hung Replacement Kits are sash-pack components, not complete window units.
• Replacement kits are not rated fenestration products and do not have full product U-factor, SHGC, VT, or NFRC-style full unit performance ratings.
• Glass ratings and glass performance values may be available for the selected insulated glass package, including glass-only U-value, SHGC, visible transmittance, UV performance, and other glass-package data where applicable.
• Glass ratings are not the same as a complete window product rating. They should be used as a glass-selection reference only.
• Because replacement kits are parts installed into an existing frame, they are typically not required to meet the same energy-code requirements as a new rated fenestration product.
• Code requirements vary by project, location, permit status, and local interpretation. Confirmation should be made with the local governing code enforcement authority where required.
• Installed performance depends on the selected glass, existing frame condition, measurements, installation method, air sealing, and field conditions.
• The customer, dealer, contractor, architect, builder, or project team must confirm whether the selected glass package and replacement kit approach satisfy the project requirements before ordering.

• U-factor measures heat flow. 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.

Laminated Glass

Laminated glass is available for Casco Double-Hung Replacement Kits. Laminated glass can be ordered with the same Cardinal LoĒ glass options when the project requires laminated glass along with a specific Low-E package.

Laminated glass is commonly reviewed when the project requires added safety, sound control, security considerations, impact resistance considerations, or project-specific glass requirements. The correct laminated glass configuration should be reviewed with the required Cardinal LoĒ coating, glass performance requirements, sash size, project location, and applicable code requirements before ordering.

Obscure Glass

Obscure glass is available for Double-Hung Replacement Kits. It is commonly used in bathrooms, mud rooms, utility areas, and other locations where privacy is needed while still allowing light into the room.

• Clear insulated glass is the base glass configuration.
• LoĒ options may be selected when the project needs improved glass performance, lower U-factor, solar control, glare control, or other project-specific performance improvements.
• Quad LoĒ-452+ with Neat+ is commonly used for strong solar control, neutral appearance, lower solar heat gain, fade protection, and naturally cleaner exterior glass.
• LoĒ³-366^® is commonly used for balanced energy performance and clear appearance.
• LoĒ³-340+ is commonly used for direct sun and glare control.
• LoĒ-i89 combinations are commonly used for improved winter thermal performance, northern climates, and lower U-factor requirements.
• Triple pane LoĒ³-366^® with LoĒ-180™ is available when the project requires additional glass performance beyond standard dual pane configurations.
• Laminated glass is available with the same Cardinal LoĒ options.
• Specialty glass options must be checked against size limits, glass package availability, lead time, and project performance requirements.
• Replacement kits are sash-pack components, not rated fenestration products, and do not have full product U-factor, SHGC, VT, or complete unit energy ratings.
• Glass ratings may be used as a reference for selecting the insulated glass package, but they are not the same as a full window product rating.
• Because replacement kits are parts installed into an existing frame, they are typically not required to meet the same energy-code requirements as a new rated fenestration product.
• Confirmation should be made with the local governing code enforcement authority where required.
• The customer, dealer, contractor, architect, builder, or project team must confirm which glass package and replacement kit approach is appropriate before ordering.

Important SDL Note: For Casco Double-Hung Replacement Kits, SDL grilles use exterior and interior applied grilles only. An internal grille between the glass is not available with SDL grilles on this product. SDL grilles also require the insulated glass unit to change from a 3/4" overall IGU to a 5/8" overall IGU.

Internal grilles, also called grilles between the glass, are sealed between the panes of insulated glass. This provides a divided-lite appearance while keeping the interior and exterior glass surfaces easier to clean.

Internal grilles are commonly selected when the project needs a grille pattern without exposed exterior or interior grille bars.

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

Internal grilles are not available when SDL grilles are selected on Casco Double-Hung Replacement Kits.

Simulated Divided Lite (SDL) grilles are applied to the exterior and interior glass surfaces to create a more traditional divided-lite appearance. SDL grilles provide more visible grille profile detail than grilles between the glass.

Double-Hung Replacement Kit SDL Note: When SDL grilles are used on Casco Double-Hung Replacement Kits, only the exterior and interior applied grille bars are used. An internal grille between the glass is not available with SDL grilles on this product.

Glass Package Note: SDL grilles require the insulated glass unit to change from a 3/4" overall IGU to a 5/8" overall IGU. This glass package change should be reviewed before ordering because it may affect configuration, availability, and project requirements.

Interior removable wood grilles are available where the project requires a traditional interior grille appearance. These grilles are mounted on the room side of the sash and can be removed from the interior side when needed.

Interior removable wood grilles should be reviewed based on interior finish, grille pattern, sash size, and project design requirements.

• Grille options should be selected before ordering.
• Double-hung grille layouts should account for both the upper sash and lower sash.
• Internal grilles are sealed between the panes of insulated glass.
• Internal grilles are available in two-tone finishes, with the exterior color matched to the selected window color and white on the interior.
• SDL grilles are applied to the exterior and interior glass surfaces.
• When SDL grilles are selected, an internal grille between the glass is not available on Casco Double-Hung Replacement Kits.
• SDL grilles require the glass package to change from a 3/4" overall IGU to a 5/8" overall IGU.
• Interior removable wood grilles are available where a removable interior grille appearance is required.
• Grille type, profile, pattern, color, glass package, and sash size should be reviewed with the project requirements before ordering.
• Because replacement kits are installed into existing frames, final appearance and fit should be confirmed by the ordering party and installer before ordering.

Ordering Note: Casco Double-Hung Replacement Kits require the replacement kit measuring method shown below. The height measurement location is specific to this product and should be reviewed carefully before quoting or ordering. The existing wood frame remains in place, and the ordering party and installer must confirm that the replacement kit measurements, frame condition, configuration, glass package, grille selection, color, and installation method are correct before ordering.

Before ordering a Casco Double-Hung Replacement Kit, the existing wood window frame must be reviewed by the ordering party and installer. Replacement kits are intended for compatible existing double-hung frames where the frame can remain in place.

Confirm the existing frame is in good condition, reasonably square, properly supported, and suitable for reuse. The sill, side jambs, head jamb, exterior trim, interior trim, water management, and previous repairs should be reviewed before ordering.

If the existing frame is rotted, damaged, out of square, leaking, poorly installed, or otherwise unsuitable for reuse, review Casco Aluminum-Clad Double-Hung Windows as a complete window-unit replacement option.

Review the measurement locations carefully before quoting or ordering. Casco Double-Hung Replacement Kits use a product-specific measuring method because the kit is installed into the existing wood frame. For height, measure from the inside wood of the head pocket down to the point where the front plane of the bottom sash meets the sill. This is the front-plane sash-to-sill dimension, not a back-of-sill pocket window dimension.

• Measure the opening width in multiple locations using the Casco replacement kit measuring method.
• Use the smallest opening width for quoting or ordering.
• Measure the opening height in multiple locations using the Casco replacement kit measuring method shown below.
• For height, measure from the inside wood of the head pocket to the point where the front plane of the bottom sash meets the sill.
• Use the front-plane sash-to-sill height dimension, not a back-of-sill pocket window dimension.
• Use the smallest required opening height for quoting or ordering.
• Measurements should be confirmed by the party responsible for ordering and installation.
• Do not assume the existing frame is square or consistent across the full opening.

To quote or order a Casco Double-Hung Replacement Kit, the ordering party should confirm and provide the required project information.

• Quantity of replacement kits needed.
• Smallest opening width based on the Casco replacement kit measuring method.
• Smallest opening height based on the Casco replacement kit measuring method: inside wood of the head pocket to the point where the front plane of the bottom sash meets the sill.
• Exterior sash color.
• Interior wood finish selection.
• Glass package selection.
• Tempered, laminated, or obscure glass requirements where applicable.
• Grille type, grille pattern, grille color, and grille layout where applicable.
• SDL grille selection, if required, including review of the 5/8" overall IGU requirement.
• Screen requirements, if made-to-order replacement screens are needed.
• Any project-specific requirements that may affect configuration, lead time, pricing, or installation.

• Clear insulated glass is the base glass configuration.
• LoĒ glass packages are available when the project needs improved glass performance, lower U-factor, solar control, glare control, UV protection, or other project-specific performance improvements.
• Replacement kits are not rated fenestration products or complete rated window assemblies.
• Glass ratings may be used as a glass-selection reference, but they are not the same as a complete window product rating.
• Standard exterior colors are available; glazing bead finish limitations should be reviewed before ordering.
• For volume orders, custom exterior colors with matching glazing beads may be quoted by project review.
• Screens are not included as a standard kit component. Made-to-order replacement screens may be reviewed separately.
• Storm windows are separate products and may be reviewed when the project needs added exterior protection, sound reduction, or a secondary window layer.
• Replacement kit sizing should follow the Casco measuring method shown above, with special attention to the height measurement from the inside wood of the head pocket to the front-plane sash-to-sill point.

Casco provides a Double-Hung Replacement Kit option for compatible existing wood double-hung frames. The ordering party and installer are responsible for confirming that the product is appropriate for the existing opening before ordering.

• Casco does not provide a new full window frame with the replacement kit.
• Casco does not guarantee existing frame condition.
• Casco does not confirm final fit based only on photos or dimensions.
• The ordering party and installer must confirm measurements before ordering.
• The ordering party and installer must confirm that the correct replacement kit measuring locations were used.
• The ordering party and installer must confirm the height was measured to the front-plane sash-to-sill point, not to the back of the sill.
• The installer is responsible for installation, adjustment, sash-to-frame fit, seal, final operation, and field performance after installation.
• Existing frame condition, out-of-square openings, water damage, rot, previous repairs, or improper installation can affect final fit and performance.
• Local code requirements vary by project and location. Confirmation should be made with the local governing code enforcement authority where required.

Downloadable Resources

Use these documents to review Double-Hung Replacement Kit product information and related project details.

Related options include Aluminum-Clad Double-Hung Windows, Replacement Casement Sashes, Aluminum Storm Windows, and Architect-Specified Windows & Doors.

For full double-hung window replacement, review Casco Aluminum-Clad Double-Hung Windows. For compatible casement, awning, or picture sash-only applications, review Casco Replacement Casement Sashes. For added sound reduction, exterior protection, or a secondary window layer, review Casco Aluminum Storm Windows.

Quick Summary: Casco Double-Hung Replacement Kits are sash-pack components, not complete window units. The existing frame remains in place, and the ordering party and installer are responsible for confirming measurements, frame condition, opening condition, installation method, final fit, and local code requirements where applicable.

Common Search Questions

Customers commonly compare double-hung replacement kits, double-hung sash packs, pocket replacement windows, full-frame window replacement, replacement window sashes, aluminum-clad replacement sash kits, and storm window add-ons. The answers below explain when a sash-pack replacement may be appropriate and when a full Casco aluminum-clad double-hung window or aluminum storm window should be reviewed instead.

A Casco Double-Hung Replacement Kit is a sash-pack replacement system for compatible existing wood double-hung window frames. The kit replaces the old operating sashes and balance / jamb-liner system while the existing frame remains in place.

Replacement kits are commonly used when the project needs updated sashes, improved weatherstripping, available glass upgrades, and exterior aluminum-clad protection without replacing the full window frame.

No. A replacement kit is not a complete window unit. It is a parts / sash-pack product installed into an existing frame. For a complete window unit, review Casco Aluminum-Clad Double-Hung Windows.

A sash-pack replacement kit can help preserve more visible glass area because it does not add a full new insert window frame inside the existing opening. This can help maintain more daylight and a cleaner appearance when the existing frame is suitable for reuse.

A replacement kit may be a good option when the existing wood frame is structurally sound, reasonably square, properly installed, and suitable to remain in place. It is often reviewed for remodel, replacement, historic-style, and lower-disruption sash-only upgrade projects.

A full window replacement should be reviewed when the existing frame is rotted, damaged, out of square, leaking, poorly installed, missing required components, or otherwise unsuitable for reuse. For complete window-unit replacement, review Casco Aluminum-Clad Double-Hung Windows.

The ordering party and installer are responsible for confirming the replacement kit is appropriate for the existing frame, measurements, opening condition, installation method, and project requirements. Casco provides a replacement sash-kit option for customers to purchase, but the field fit must be confirmed by the party ordering and installing the product.

No. Photos and dimensions can be helpful for the ordering party, dealer, contractor, or installer during their own review, but Casco does not confirm or guarantee that a replacement kit will fit based only on photos or dimensions. The ordering party and installer must complete the final review before ordering.

The existing frame should be reviewed for condition, squareness, sill condition, water management, trim condition, frame damage, rot, previous repairs, measurements, installation method, and whether the frame can accept the replacement kit components.

Review the How to Order section for ordering details.

For height, measure from the inside wood of the head pocket down to the point where the front plane of the bottom sash meets the sill. This is the front-plane sash-to-sill dimension and should be confirmed using the Casco measuring diagrams in the How to Order section.

Yes. Replacement kits can be ordered in custom sizes within product and project limits. The ordering party must provide the correct measurements and confirm the selected size is appropriate for the existing frame and installation method.

No. Installation labor, field measuring, removal of existing components, field adjustments, finishing, and final fit are not included with the replacement kit. These items are handled by the dealer, contractor, installer, or ordering party.

A typical kit includes new aluminum-clad upper and lower replacement sashes, pine wood interior sash surfaces, clear insulated glass as the base glass configuration, replacement-style compression jamb liners, a cam-action sash lock, a new vinyl head parting stop, installation clips, and fasteners.

Review the Features section for full details.

A new full window frame is not included. Exterior casing, sill, stool, apron, interior trim, exterior trim, frame repairs, installation labor, field verification, finishing labor, final fit adjustments, and screens are not included as standard kit components.

No. Screens are not included as a standard kit component. Made-to-order replacement screens may be reviewed when needed. Existing screens may remain if they are suitable and compatible with the project.

The base glass configuration is clear insulated glass. LoĒ glass packages are available when the project needs improved glass performance, lower U-factor, solar control, glare control, UV protection, or other project-specific performance improvements.

Available glass options include dual pane Quad LoĒ-452+ with Neat+, LoĒ³-366^®, LoĒ³-340+, LoĒ-i89 combinations, and triple pane LoĒ³-366^® with LoĒ-180™ where available and appropriate for the project.

Review the Glass section for glass option details.

No. Double-Hung Replacement Kits are sash-pack components installed into existing frames. They are not rated fenestration products or complete rated window assemblies and do not have full product U-factor, SHGC, VT, or NFRC-style full unit performance ratings.

Glass ratings and glass performance values may be available for the selected insulated glass package. These may include glass-only U-value, SHGC, visible transmittance, UV performance, and other glass-package data where applicable.

Glass ratings are not the same as a complete window product rating. They should be used as a glass-selection reference only.

Because replacement kits are parts installed into an existing frame, they are typically not required to meet the same energy-code requirements as a new rated fenestration product. However, code requirements vary by project, location, permit status, and local interpretation. Confirmation should be made with the local governing code enforcement authority where required.

Yes. Laminated glass is available and can be paired with the same Cardinal LoĒ glass options where available and where the selected sash size and project requirements allow.

No. CLiC glass and Blink / ODL blinds-between-glass are not offered on Casco Double-Hung Replacement Kits. For this product, specialty glass should be reviewed around available insulated glass, LoĒ glass, laminated glass, tempered glass, and obscure glass options.

Available grille options include internal grilles between the glass, simulated divided lite (SDL) grilles, and interior removable wood grilles where available. Grille type, pattern, color, glass package, and sash size should be reviewed before ordering.

No. When SDL grilles are used on Casco Double-Hung Replacement Kits, only exterior and interior applied grilles are used. An internal grille between the glass is not available with SDL grilles on this product.

Yes. SDL grilles require the insulated glass unit to change from a 3/4" overall IGU to a 5/8" overall IGU. This should be reviewed before ordering because it may affect configuration, availability, and project requirements.

Standard exterior color options are available for Casco Double-Hung Replacement Kits. Color selection should be reviewed with the existing frame, exterior trim, interior finish, project requirements, and available glazing bead limitations before ordering.

Review the Colors section for color galleries and notes.

No. Exterior matching glazing bead is available in White, Almond, Beige, Dark Bronze, and Black only. If another standard exterior color is selected, the glazing bead must be selected in an unmatched finish.

For volume orders, custom exterior colors with matching glazing beads may be quoted by project review. Availability, minimum quantities, lead times, pricing, and final color approval must be confirmed before ordering.

Yes. Interior prefinished wood colors are available for projects requiring factory-finished interiors. Physical samples should be reviewed when color accuracy is critical.

Made-to-order screens can be reviewed to replace existing screens where needed. Screens are separate from the replacement kit and should be reviewed based on the existing opening, screen fit, and project requirements.

Yes. Casco Double-Hung Replacement Kits can be paired with Casco aluminum storm windows when the project needs an added secondary window layer, additional exterior protection, improved comfort, sound reduction, or a more complete upgrade without full-frame replacement.

Storm windows are selected separately and should be reviewed based on the existing exterior opening, sill condition, drainage path, mounting surface, sound-control goals, and project requirements. Review Casco Aluminum Storm Windows for available storm window models and options.

Warranty coverage applies to the replacement kit components as provided by Casco, including applicable insulating glass warranty coverage where applicable. Warranty coverage does not guarantee that an existing frame is suitable, that the kit was measured correctly, or that the installed sash-to-frame fit will perform properly after installation.

The installing party is responsible for confirming the fit, seal, installation method, adjustment, and final operation of the replacement kit within the existing frame. Casco does not cover air or water performance issues caused by existing frame condition, incorrect measurements, improper installation, or field conditions outside of the supplied sash-kit components.

If the existing frame cannot be reused, review Casco Aluminum-Clad Double-Hung Windows as a complete window-unit replacement option.

For compatible casement, awning, or picture sash-only applications, review Casco Replacement Casement Sashes.

Product information can be reviewed in the Casco Double-Hung Replacement Kit Brochure. Additional product information is available in the Resources section.

Casco Double-Hung Replacement Kits can be a practical sash-pack replacement option when the existing wood frame is suitable to remain in place. They help update the operating sashes, improve available glass options, preserve more visible glass area than many pocket-style insert windows, and reduce disruption compared with full-frame replacement when the project conditions allow.

Review the Features, Glass, Grilles, Colors, and How to Order sections before ordering.