If the concrete floor is dry and reasonably level insulate directly on top with a rigid foam insulation that is impervious to moisture air leakage and radon gas.
Best insulation over concrete floor.
The foil within the product acts to spread out the heat signature of the heating coils.
How to insulate a garage floor above a concrete slab.
Once the basement is prepped choose an insulation to reduce heat loss and moisture transfer from the slab.
If you know you have issues with moisture tend to those problems before installing the insulation.
Concrete is cold and hard but an insulated concrete slab can make a heated garage significantly warmer and more energy efficient.
Address uneven floors prior to installing any floor system the low spots should be fixed with concrete patch or floor leveler.
Mortar a trowel and grout are used in the installation of tiles and the work is more difficult and time consuming than covering concrete with other fabrications.
If the basement floor is wet hire a professional find the source of the problem and fix it before doing anything.
When slab insulation is provided a sheet polyethylene vapor barrier should be located over the rigid insulation and in direct contact with the concrete slab.
Here we look at why insulating concrete floors is so important and offer tips on choosing and installing concrete floor insulation.
Also check the floor for smoothness and level.
There are two ways to handle insulating concrete floors.
Why it s important to insulate a concrete floor in the basement three key benefits of insulating the concrete floors in the basement are heat loss prevention moisture prevention and a higher level of comfort.
1 to prepare for insulating the floor first evaluate the condition of the concrete.
Or as demonstrated here you can cover the slab with rigid foam insulation add two layers of plywood and then add the finish flooring.
You can attach wood sleepers to the floor fill the gaps with rigid foam insulation and then apply your finish flooring.
As the slab will only be able to dry upward the slab should be allowed to dry before finishes are applied.
You may need to grind down significantly high spots to ensure an even surface.