Unlike above grade sub flooring basement sub floor has to do all of the usual things and more.
Rigid foam subfloor.
There are several ways to install subflooring above the rigid foam.
Thermaldry insulated subfloor system will not attract mold or be damaged by moisture.
Keep in mind that any interior rigid insulating panel must be covered by a barrier.
Lay sheets of high density rigid foam over the polyethylene.
Rigid foam insulation.
Use a utility knife to cut the foam to size a hacksaw or drywall saw also work well for this.
Rigid foam is a nice option because it provides an excellent thermal break between concrete and flooring.
A common choice is drywall.
Tape the seams of the foam panels with heavy duty construction tape.
If your basement slab lacks sub slab foam you ll have to install the insulation above the slab.
How doers get more done.
Basement subflooring has so many jobs at hand.
Continuous layer of rigid foam insulation keeps floors warm and comfortable.
Insulation and subflooring get installed in a single step providing fast hassle free installation.
Lay rigid foam.
The panels provide a continuous energy efficient surface.
Follow with a 2x4 frame wall and insulate it with batt insulation.
Thermaldry insulated subfloor benefits.
Provide a flat level surface for the finish flooring.
Leave a 1 4 inch gap around the perimeter.
Rigid foam insulation creates a solid barrier between the inside and outside of your house acting as an obstacle in the way of heat and cold transfer.
Insulated foam sheets are also used as an insulated sheathing underlayment for exterior siding.
However not all rigid foam insulation packs are created equal.