How Important is the New Construction Window Nailing Flange?

Well, it’s pretty important…

The nailing flange on a new-construction window is that metal or plastic apron-like piece that extends outward to let you nail the window against the house.

Note that replacement windows will not have a nailing flange; only new-construction windows will have this nailing flange.

The nailing flange is the thing that really ties your new construction window tight against the side of the house. Even though it will eventually get sealed down with silicone caulk, you want to make sure that it stays in good condition.

So, make sure that you do not bend out that nailing flange until the very last minute. Bending it out ahead of time means that you risk creasing it and making it less weather resistant.