Purpose

Waterproofing is a requirement for structures built at or below ground level. Groundwater is likely to build up in the soil and raise the water table therefore, waterproofing and drainage considerations are especially important. A higher water table causes hydrostatic pressure (water level increases due to the weight of the house) to be exerted underneath basement floors and against basement walls. Hydrostatic pressure forces water in through cracks in foundation walls, and through openings caused by expansion and contraction of the footing-foundation wall joint, or up through floor cracks. Hydrostatic pressure can cause major structural damage to foundation walls and is likely to contribute to mold, decay, and other moisture-related problems.