The problem with using floor slabs that are made with porous concrete is that they can collect moisture, which may lead to the growth of mold. This creates an unhealthy working and living environment, in addition to the moisture compromising the integrity of the structure. Long-term moisture control is required to protect the building's foundation and ensure its longevity. Without ample protection, the concrete will pull water up from the dirt below, allowing moisture to seep through the floor, walls and joints. When you install a sub-base course, the concrete slabs will no longer absorb water, keeping the building envelope dry and protected.
