Even when the underlayment is pre installed you might still want to add a small moisture barrier layer underneath to keep more moisture away from your flooring.
Thick padding for concrete floors.
Concrete floors are hard cold and often times uneven thus rugs could often benefit from a more cushioned rug pad.
One inch is typically the maximum thickness this can be poured and that s plenty to cover radiant floor tubing.
Cut pile residential carpet such as those with textures and twists should have padding with a thickness of 1 2 inch or less.
Low spots deeper than 1 will need to be filled with an initial layer of this material or with standard concrete before a self leveling material is poured over it.
Some floors come with underlayment pre installed.
The density of the carpet pad foam is another factor to consider.
Frothed foam is densely packed and will adhere well to the concrete and the carpet backing.
Rug pads for concrete basement floors.
If you choose a low pile carpet which includes berber loop pattern carpet and commercial varieties the carpet pad thickness should be 3 8 inch or less.
Given that concrete floors are often found in basements you would also want a rug pad that won t mold or mildew.
This is the most commonly used.
This is usually 3mm thick or 1 8 thick.
This can be a plus for carpeting a family room or recreation room that has a concrete subfloor.