Cut the rigid foam insulation to fit between the furring strips. Before you cut foam, always make sure your work surface is flat, stable and won't be damaged by cutting through the foam with the knife. With these tools, cut foam could be an uneven and rough edge. Make sure it's really sharp before you try to cut the foam. The only foam that's actually worth it are foam monitor isolation pads, and that's for decoupling structures and absorbing physical vibrations, not sound wave vibrations. How to Cut High-density Foam to Size: Sometimes you need to cut the high-density foam at home, but it is not so easy with a pair of scissors even garden shears. Use a straight edge or ruler and use a permanent marker to make a clear and precise line. Rigid foam sheets are best for do-it-yourselfers who are insulating basements prior to framing the walls. It's the same electric knife you use to cut turkey or a roast. For advice on how to cut … If you'd rather cut unusual shapes out of your sheet, cut the foam with a cookie cutter. I bough what I believe to be the perfect RV vanlife mattress. Apply adhesive to the interior of the wall between the furring and glue the rigid foam insulation. For the production of upholstery furniture smaller blocks of foam are cut out of bigger rectangular blocks . They used a electric knife to cut the soft foam. To cut soft or rigid foam that's 1/2-inch (12 mm) thick or less, lay the foam flat on your work surface. You most important problem will be preventing rotation while making your cut. Then, clamp the rigid board to a flat surface with rubber clamps so it's held still and you can cut it with a utility knife or circular saw. We normally like the thinner boards, but the thicker 1-inch boards did the trick. Your first cut doesn’t have to be perfect, as you are simply removing the extra hair off the bottom. You can slice off one side for a larger opening (like widening the open edges on the letter "C"). We were able to cut a trifold memory foam mattress to create the perfect truck camping bed to fit our odd sized space! I show how I cut it to size to fit my slat bed. Rigid foam is an inexpensive, durable, readily available product that comes in a variety of R-values. Contour memory foam pillow: This is a literal slab of foam that has a subtle groove and two rides that run horizontally from one side to the other. 1- 1/2" PVC is the most difficult. Ask the other person (or yourself) what shape the cut should be, how long the hair should be cut to, or if there are any style inspirations you can use as a guide. I needed to make a cut in 3-part foam RV mattress that was 4.5″ thick, and I wanted to cut it at 2″ up from the bottom where the first layer was glued to the 2nd layer. Demonstration of how to cut upholstery foam with an electric knife. 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