How To Install Interior Window Trim. Place a side casing against the wall aligned with the reveal line on a side jamb. A reveal will create a shadow.
Use a wood plane sander or. In this video This Old House general contractor Tom Silva installs interior window trim using hand tools. Then mark the other end flush with the inside of the jamb.
It is not a building when there is no door or window.
Mark the location of each side casing on the wall. Thatll give you a 316-in. Then mark the other end flush with the inside of the jamb. Repeat for the opposite jamb.