Measure and cut the trim. We used 1/4 by 1 inch flat pine trim. The edge of the foam board will be nothing but crumbly foam, so you'll need lots of glue and several nails to hold the wooden edging in place. A simple white glue such as Elmer's or Titebond should do it. Start the nails in the trim pieces first. Lavish the glue on the foam board edges, then tap the trim in place. Rubber bands or bungee cords stretched around the board hold the wood trim in place while the glue sets.
Photohraphy By Susan Wasinger