Window and Door Replacement
Window installation approaches differ depending on whether the wall assembly is new or existing. New construction and full-frame renovation installations differ from insert (pocket) installations in important ways that affect performance and cost.
New construction windows have a nailing fin — a perimeter flange that laps over the exterior sheathing and is fastened through the flange into the framing. The flange creates the primary water management layer at the window perimeter.
Energy Efficiency and Style
Nailing fin installation requires integration with the weather-resistant barrier (housewrap). Tape laps at the top and sides of the nailing fin, with the bottom left free for drainage. This sequencing creates a shingle-style drainage plane.
Insert (pocket) installations fit a new window unit into the existing frame without removing the existing frame. This approach preserves interior trim and exterior cladding but retains the existing frame, which may have moisture damage.
Getting a Free Estimate
Full-frame renovation installations remove the existing window and frame entirely, exposing the rough opening. This allows inspection of the rough opening for moisture damage, proper flashing installation, and full integration with the weather barrier.
The choice between insert and full-frame is driven by existing frame condition, window performance goals, budget, and tolerance for disruption. Insert is faster and less expensive; full-frame produces a better overall performance outcome.
Regardless of installation type, air sealing around the window frame with low-expansion spray foam prevents air infiltration between the rough frame and window jamb — a significant energy loss pathway in many existing homes.