Installing foam crown molding can provide you with a very functional alternative to real wood molding. It is substantially cheaper than going with wood, and you really cannot tell a difference between the two. Here's how to properly install foam crown molding.
Measure the Area
Determine exactly how much foam crown molding you will need for the job. Take your tape measure and measure the perimeter of the room that you plan on installing it. Add all of the lengths together and then add about 5% to that number for waste.
Determine the angles that you will need to cut on the molding with an angle finder. Take the total angle and divide by two to determine how much of an angle to cut on each piece.
Make the Cuts
Use a miter saw to make the angled cuts that you need. Make sure to hold the crown molding firmly in the miter saw and make a quick and solid cut through the molding. You want to make sure that you firmly cut through the molding to prevent any jagged edges.
Sand the Edges
Use sandpaper to smooth down the rough edges on the molding. If you do not get them perfectly smooth, they may not fit together as well and the installation will not look as good.
Install the Molding
Use a caulk gun to apply the foam adhesive. Apply the adhesive in a zigzag pattern onto the back of the foam molding. Take the molding and press it firmly against the wall or ceiling. Make sure that there is no gap between the wall and the molding. Hold the molding into place for approximately 30 to 60 seconds, in order to give the adhesive time to dry.
Fix the Seams
Fix the seams where the molding meets together. You want it to look like one continuous piece of molding. Use painter's putty to fill in the gaps between the pieces of molding.
Stain or Paint the Molding
Foam crown molding can be stained or painted to the color that you desire. Once the molding is in place, you can begin staining it or painting it depending on what you prefer. You may want to use a coat of primer first and then apply the paint on top of the primer. Once you allow the paint to dry, you should be completed with the job.