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How to install rigid foam insulation on basement floor.
Or as demonstrated here you can cover the slab with rigid foam insulation add two layers of plywood and then add the finish flooring.
There are two ways to handle insulating concrete floors.
Make sure the foam boards run from the floor to the underside of your floor deck above.
First place a layer of 1 1 2 closed cell foam insulation board against the basement walls using a manufacturer s recommended adhesive.
There are several ways to install subflooring above the rigid foam.
Most homes use fiberglass but rigid foam insulation although more costly offers a few extra features.
Step 4 install the insulation.
Is rigid foam insulation the right insulation for your basement.
You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring.
Once the insulation has been placed you will want to cover it up with plywood.
Place your rigid foam insulation between the sleepers in the open areas.
You may need to cut the insulation down with a utility knife to make sure it fits properly between each grid.
Step 5 cover with plywood.
If your basement slab lacks sub slab foam you ll have to install the insulation above the slab.
This is very common mainly because it is very cost effective.
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.