How To Install Window Trim Interior Youtube. Now you can install the two vertical side pieces of trim. Start at the top and align the outside of the trim with the end of the head trim.
Add an additional amount to the top and bottom. Measure and crosscut the window stool to length from 1x4 primed pine. Allow one inch on each side of the stool.
I used the 1x5 as the window stool I used to call it a sill.
Place the top piece and hold the trim 316 in. The window trim is made up of the following. Use a pencil scriber to mark a notch on each end of the stool. Please enable JavaScript to watch this video.