Rigid Foam Under Subfloor

Use a utility knife to cut the foam to size a hacksaw or drywall saw also work well for this. Most people do not think about insulating their floors unless perhaps it s their attic floor. Foam board insulation is used on attics and walls yet it can also be used to insulate your floors.

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The other was 2 of blue foam over a concrete slab with a layer of 2 x2 squares of osb with plastic dimple board as a floating floor over the foam.

Rigid foam under subfloor.

Rigid foam is a nice option because it provides an excellent thermal break between concrete and flooring. One install was 4 of blue foam with woven wire mesh and radiant floor heat with 3 of concrete first and 2 of bluestone and setting bed over it. Thinking outside the slab one solution would have been installing rigid insulation under the slab turning it up on the perimeter to form a giant pan and then casting the concrete slab inside the pan. With a rigid core plank you can add additional underlayment under the planks however i would keep it at 2mm or under.

You simply lay sheets of foam on the basement floor then fasten 5 8 plywood on top with concrete screws driven into predrilled holes in the floor. For the pool table you will still float the floor normally. Lay sheets of high density rigid foam over the polyethylene. Lay rigid foam.

Provide a flat level surface for the finish flooring. The top layer of subfloor steps back and gets a layer of peel and stick flashing tape to form pan flashing under the sliding doors. Rigid foam makes a great basement floor insulation. Rigid foam insulation.

Unlike above grade sub flooring basement sub floor has to do all of the usual things and more. Leave a 1 4 inch gap around the perimeter. Basement subflooring has so many jobs at hand. Since the weight it distributed throughout the 4 legs it will still be able to float normally.

Tape the seams of the foam panels with heavy duty construction tape. The right kinds are even dense enough to support a plywood subfloor without any supporting wooden strips underneath. But insulating your floors is a good idea for many reasons including energy efficiency and height adjustments.

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