If you are laying over a concrete subfloor you will first need checked the concrete moisture, if the floor has a moisture content of over 4% then either wait until the sub floor dries to meet this level or use an appropriate moisture barrier, we recommend Mapei brand Primers to ensure no damp rises up into your new floor.
During renovation and remodeling of existing building, more and more people are looking for ways to convert their existing wood/plywood subfloors into concrete floors. The daily temperature and humidity changes cause the wood floors to move and expand under stress. The joints between boards and rough uneven surfaces become pronounced. Traditional latex-modified or gypsum based underlayments will crack along joints, break bond with lateral wood movement, and often strong enough to withstand the traffic. (more…)