The precise mechanics of swapping out a bathroom window

How to Install a Replacement Window | This Old House · 3:11 · Video: This Old House · Watch at the source

In short: Replacing a window is more than just a surface swap; it requires a systematic approach to insulation and structural integrity. This guide from This Old House walks through the professional sequence for a clean installation.

The process begins with deconstruction: removing interior trim, cutting sash cords to free the sash, and extracting the old frame and internal weights. A critical step for energy efficiency involves filling wall voids with fiberglass insulation and applying butyl caulk and expanding foam to the sill and flashing.

The new window is secured using four 2-inch stainless steel screws. The final aesthetic and weather-sealing layers consist of PVC trim, additional caulking, and the installation of window stops.

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