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