Crown Molding with Corner Blocks

Tools:

workbench
ladder
miter box and saw
clamp
caulk gun
hammer
nail set
pencil
drill
wood rasp
tape measure
towel
safety glasses
dust mask
polystyrene corner blocks
crown molding
wood glue
double-sided tape
caulk

1. You'll probably have to join two strips of molding to run the length of your walls. Use the miter box and saw to cut the ends of the molding at a 45-degree angle where they'll join (figure A). This makes for a neater joint and the pieces are less likely to separate. Remember to wear eye protection and a dust mask while sawing.

2. Attach the corner block to the corner using double-sided tape. Fit your first piece of molding in place with the square-cut end flush to the side of the corner block (figure B).

3. Secure the molding by driving finishing nails into the stud running along the ceiling (figure C). Drill pilot holes first and space the nails about six to eight inches apart. Use a nail set to sink the nail heads below the surface.

4. For corners in the room that aren't quite square, use a rasp to file away the back of the corner block so it fits (figure D). Make sure to only remove material from areas of the block that will be hidden once it's installed.

5. Install the next block and measure for the next molding piece (figure E). Measure from the corner block to the short end of the molding cut.

6. Test fit the piece to make sure it fits snugly between the previously installed piece of molding and the corner block (figure F). Put a dab of wood glue on the mitered end and attach using finishing nails.

7. Continue the process, working your way around the room (figure G).

8. Apply a bead of caulk between the ceiling and the molding (figure H). Use a high-quality paintable caulk. Also dab caulk over the nails to cover the nail holes. Use a towel to wipe away excess.