Rigid Foam Under Subfloor

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 under subfloor. 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. Rigid foam is a nice option because it provides an excellent thermal break between concrete and flooring. Rigid foam insulation.

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. Leave a 1 4 inch gap around the perimeter. Provide a flat level surface for the finish flooring.

But insulating your floors is a good idea for many reasons including energy efficiency and height adjustments. Unlike above grade sub flooring basement sub floor has to do all of the usual things and more. Lay sheets of high density rigid foam over the polyethylene. The right kinds are even dense enough to support a plywood subfloor without any supporting wooden strips underneath.

For the pool table you will still float the floor normally. With a rigid core plank you can add additional underlayment under the planks however i would keep it at 2mm or under. 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. 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.

Use a utility knife to cut the foam to size a hacksaw or drywall saw also work well for this. Lay rigid foam. Rigid foam makes a great basement floor insulation.