HDPE membrane waterproofing is a type of barrier that works to keep moisture and air from entering the interior of a building or house. HDPE membranes are used underneath concrete slabs, crawlspaces, and below-grade walls in order to prevent mold, mildew, and rot from forming. While they work as both a vapor barrier and an air barrier, only an air barrier can fully stop the flow of air. Depending on the climate, using a vapor barrier on the interior side of framed walls may or may not be necessary.
For effective waterproofing, HDPE (High Density Polyethylene) membrane plays an important role since it acts as a strong vapor retarder and air barrier. Despite being called different names interchangeably like ‘house wraps’ or ‘weather-resistive barriers’, it is necessary to ensure its full continuity without any punctures, tears or gaps in order to prevent the movement of vapor.