Trim Moulding for a Built in Bookcase

Prepping the Site

• If the bookcase has not already been installed, remove any molding from the site so you don't have to cut the case to fit around existing molding. Use a reciprocating saw to accurately cut sections without having to remove the entire run of molding. Save the baseboard and crown molding if the bookcase goes to the ceiling.

Raising the Case

• Make sure the base of the bookcase can accommodate your baseboard. Install stilts on the bookcase if you need to. You can create a simple frame to attach to the floor, using dimensional 1-inch lumber (3/4-inch thick). Make sure the bottom shelf is about 2 inches above the baseboard.

Baseboard

• Once the case is installed, apply matching baseboard around the bookcase so it integrates with the existing baseboard. If you can't find new baseboard to match, you often can find matching baseboard in closets, behind kitchen appliances and in back hallways.

Crown Molding

• If the case doesn't go to the ceiling, install crown molding to the top of it. If the room already has crown molding, use a similar molding. Use a crown in scale with the bookcase. If it's a tall case on a tall wall, use a full-sized 4 1/2- or 5 1/2-inch crown. If it's smaller, use a 2 1/2- or 3 1/2-inch crown or bed molding. If the case goes to the ceiling or is close, install matching molding, integrating it with the existing crown, if you have it. If you need to, use a few inches of 1/2-inch flat molding to bridge the gap between bookcase and ceiling.

Finishing

• Prepare to paint by filling nail holes and major defects with spackling compound. When the compound is dry, sand it smooth and remove the dust with a damp cloth. Prime the compound, let it dry, then caulk gaps with with latex caulk, wiping off the excess with a wet finger. Allow everything to dry, then paint with a good-quality acrylic latex paint to match existing trim. Use a trim brush and brush in the direction of the grain, using long strokes for a smooth, even finish. For a professional finish, sand between all primer and top coats, but not after the last.

Tips

• Painting all of the trim in a room -- or at least all of the trim on the same wall -- with the bookcase ensures you get a seamless paint job. To up the design ante, you may install a face frame to the bookcase before installation. A plain, store-bought wooden bookcase makes an easy start to a built-in project.