Rigid Foam Over Subfloor

Expanded polystyrene eps extruded polystyrene xps and polyisocyanurate are the most used types of rigid foam insulation. The foam butts against the mudsills for a complete thermal break. The polyethylene sheet becomes part of a continuous air barrier for the home.

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Rigid foam over subfloor.

This will also help eliminate the hollow sound and feel the floor will have over the foam. Proper subfloor for hardwood in a renovation. There are several ways to install subflooring above the rigid foam. Leave a 1 4 inch gap around the perimeter.

Rigid foam is a nice option because it provides an excellent thermal break between concrete and flooring. Two layers of 3 4 inch osb subflooring then float unattached on top of the foam to provide a solid and stable underpinning for the wide board wood floors. You can use either one or two layers of plywood or osb and the subflooring can either be fastened to the concrete with long tapcon screws or it can simply float above the foam. Use a utility knife to cut the foam to size a hacksaw or drywall saw also work well for this.

If you choose to have a floating subfloor it s best to install two layers and screw them together. Lay sheets of high density rigid foam over the polyethylene. I glued 1 inch thick rigid foam board onto the concrete floor which i had previously treated with a 1 16 inch coating of xyprex moisture proofing. Use t g and screw through the foam and the into original floor to keep the large sheets flat.

Plywood screwed down through the layer below. For your install plywood will work fine. While all foam insulation products are derived from petroleum some of the key differences include water resistance r value per inch compressive strength facings permeability to water vapor and evidently cost. Then i glued osb sheets to the foam board.

Tape the seams of the foam panels with heavy duty construction tape. Every 8 on the edges and 12 in the center.

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