What is the benefit to using screws for extension jambs and in window sills?
In a word…strength. Pneumatic finish nailers are great, but they don’t provide for much structural strength. Installing screws in extension jambs helps to ensure they don’t warp as they dry in the sun, while screwing through the window sill into the wall studs makes the window sills exponentially stronger (people have actually been known to lean on window sills!).
