INSTALLATION U3 SPLICES For splices in wall cavities, either overlap the material to complete the cavity or cut the insulation square and carefully butt the two pieces together to minimize any break in the insulation for that cavity. Tape the seam if the wall can be seen. WALL OUTLETS Cut the insulation so that it fits snugly around the outlet. If the wall can be seen, tape the edge of the insulation to the box, NOTES: Tape any tears in material.