There are two types of flood-proofing—dry and wet. The design intent of dry flood-proofing is to allow flood waters to enter and exit the structure freely and allow the waters to rise and fall evenly inside the structure in the same rate and manner they rise and fall on the outside.
Fluid-applied waterproofing materials have been used for centuries. Over the years, there has been much advancement in material chemistry and technology. However, even with new developments, proven performance in previous technologies still warrant their use around the world.
Weather-resistant barriers (WRBs), also known as building wraps or housewraps, are one of the best building materials for controlling water, either through blocking rain from entering the wall cavity, allowing moisture vapor to move and escape the wall cavity, or draining bulk water away from the wall assembly.
With the variety of cladding materials available today, and designers’ penchants to combine styles and textures, it is essential to specify building envelope controls that are compatible with multiple cladding types. This balancing act between aesthetic preferences and air and moisture management is where gypsum-integrated water-resistive barrier-air barrier (WRB-AB) sheathings shine.