How to Install Interior Window Trim | Ask This Old House

This Old House general contractor Tom Silva installs interior window trim using hand tools. (See below for a shopping list, tools, and steps.)
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Shopping List for Installing Interior Window Trim:
– 1×4 primed pine, used to make window trim
– 120-grit sandpaper, for smoothing the window stool
– 2-inch (6d) and 2 1/2-inch (8d) finishing nails
– Carpenter’s glue
– Damp cloth, used to wipe away excess glue and sanding dust
– Wood putty, for filling nail holes
– Interior-grade paint

Tools List for Installing Interior Window Trim:
– Layout square, used to mark square cutlines
– Handsaw, for cutting the wood trim
– Block plane, for rounding over and smoothing the window stool
– Hammer
– Scriber, used to mark the stool notches
– Nailset, for setting nailheads
– Putty knife, used to apply wood putty
– Sash brush, for painting the trim
 
[BOLD “Steps for Installing Interior Window Trim:
1. Mark the location of each side casing on the wall.[BR]
2. Measure and crosscut the window stool to length from 1×4 primed pine.[BR]
3. Rip the window stool to width using a handsaw.[BR]
4. Use a pencil scriber to mark a notch on each end of the stool.[BR]
5. Saw the notches from the stool so it fits snugly around the window stops.[BR]
6. Round over the sharp edges and ends of the window stool using the block plane and 120-grit sandpaper.[BR]
7. Fasten the stool to the window with 2[FRACTION 12]-inch finishing nails.[BR]
8. Tap the nailheads below the surface using a hammer and nailset.[BR]
9. Saw the side casings to length, then glue and nail them in place with 2-inch and 2[FRACTION 12]-inch finishing nails.[BR]
10. Nail up through the underside of the window stool and into the bottom end of the side casings.[BR]
11. Mark and crosscut the head casing to length.[BR]
12. Glue and nail the head casing across the top of the window.[BR]
13. Mark and cut the apron to length.[BR]
14. Apply glue along the top edge of the apron, then nail it to the wall directly below the window stool.[BR]
15. Wipe away any excess glue with a damp cloth.[BR]
16. Fill all nail holes with wood putty. Once the putty dries, sand the surface smooth.[BR]
17. Wipe away sanding dust with a damp cloth, then paint the trim.

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Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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How to Install Interior Window Trim | Ask This Old House
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