FAQ: What Is Hybrid (Split Frame) Window Installation?
Q: What is hybrid or split frame installation?
Hybrid installation, also known as split frame installation, is a combination method that involves full-frame replacement on the exterior while preserving the original interior components.
This method is typically used when:
- The existing window is vinyl
- The jamb extension is wood
- The interior casing (trim) is custom or high-quality wood the homeowner wants to keep
Hybrid installation offers a balance between improving energy efficiency and preserving interior aesthetics.
Q: What are the steps involved in split frame (hybrid) installation?
1. Selective Removal
The installer removes:
- Exterior brickmould
- Old window frame
The following are preserved:
- Interior casing (wood trim)
- Jamb extension (interior ledge)
2. Cleaning and Prep
- The stud cavity between brick and drywall is vacuumed and cleaned.
- Old exterior caulking is removed from surrounding brick or siding.
3. Window Installation
- The new window (without brickmould) is inserted into the opening.
- The window is centered with even gaps on both sides.
- Shims are placed at bottom corners to ensure level placement.
- The window is then screwed securely into the studs.
4. Insulation
- Low-expansion spray foam is applied from the exterior to insulate between the frame and studs.
5. Exterior Finishing
- The gap between the window and brick or siding is measured.
- Custom aluminum capping (brickmould) is fabricated and installed.
- Exterior caulking is applied around the aluminum for weatherproofing.
Q: What are the advantages of hybrid installation?
- Cost-Effective: Less expensive than full-frame replacement.
- Preserves Interior Trim: Keeps original wood casing and jamb extension intact.
- Blinds and Shutters Fit: Interior dimensions remain unchanged.
Energy Efficiency & Grant Eligibility:
When paired with ENERGY STAR® certified windows, hybrid installation also qualifies for most
Canadian home energy rebate and grant programs, including those that reward
homeowners for improving insulation and window performance. This means you can preserve your interior finish
while still enjoying both comfort and potential financial incentives.
Q: What are the disadvantages of hybrid installation?
- Limited Insulation Access: If the original jamb wasn’t insulated, you cannot add insulation without removing the preserved interior trim.
Hybrid installation is ideal for homeowners looking to modernize their windows while preserving interior craftsmanship and reducing costs.
Contact us to find out if it’s the right solution for your home.
