Trimming out window interiors
raises several design issues — as well
as some practical concerns. Since I
use only wood windows on my projects,
I'll confine my comments to
those. Many of the same problems
arise with aluminum or vinyl
windows, but their wider frames
solve some problems and create
others.
There are three general ways to
trim out the inside of a wood
window:
(1) Flat casings — the traditional
approach
(2) Plaster returns — a "trimless"
system where the wall returns to the
window frame
(3) Window-box casings — an
edge-on liner applied to the jambs,
head, and sill of a window, projecting
out from the drywall
1/2 inch or so
The major design issues differ
somewhat for each of these three
trim