Flanged Window Replacement in a House with Wood Siding (2/5)
Step 2: Remove The Old WindowSee how to build window casing and use that casing as a template to cut back existing siding before you install the new windowWith Bill Robinson
Retrofitting a new window isn’t always easy, because you want the new window to integrate seamlessly into the existing siding. So before he makes any cuts, Bill builds the casing for the new window. The trick with the casing is that you want to add 1/4-in. to the inside dimension for a caulking joint between the casing and the new window. This helps with expansion and contraction. He also uses pocket screws and construction adhesive for strong water-resistant joinery. The reason that he builds the casing first is so that he’ll have an accurate template to measure his cuts from. Next, he builds a cutting guide out of 1/2-in. plywood. The cutting guide, also known as a shooting board, guides the saw over the uneven siding. Bill makes sure to cut on both sides of the guide’s fence so the board can be used form either direction. Bill Robinson: What I’ve done here is set up my crosshair laser level to give me centerline on this window. What I’m going to do now is take my measurements off the center of this line here and extend them out either direction. That’s going to give me the marks I need to make to set up my shoot board to make the cuts and remove the siding. This casing is 58 3/8-in. wide. I’m going to leave a little room, so I’ll mark to cut the opening 58 1/2-in. wide. That’s 29 1/4-in. to the left and right from my center mark. Once I have my shoot board set up, I’m ready to make my cut. The next thing I have to do is set the depth of my cut. It’s better to cut to shallow than too deep so i don’t do any damage to housewrap or sheathing underneath. Now I’m…
Step 5: Flash, Trim, and Seal the WindowWatch remodeler Bill Robinson as he shows how to use a combination of materials to flash over the flanges, and install a pre-built casing over the new window.
Step 4: Install the WindowWatch remodeler Bill Robinson as he applies sealant to the window flange, checks the window for plumb, level, and square, and fastens the flanges to secure the window.
Step 3: Prepare the OpeningLearn how to clean the existing rough opening and inspect for damage before installing the new window. Also, see how to waterproof the opening with self-adhesive flashing tape.
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