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In construction, a building or structure is waterproofed with the use of membranes and coatings to protect contents and structural integrity. The waterproofing of the building envelope in construction specifications is listed under 07 - Thermal and Moisture Protection within MasterFormat 2004, by the Construction Specifications Institute, and includes roofing and waterproofing materials.
Waterproofing a structure from the exterior is the only method the U.S. International Building Code (IBC) recognizes as adequate to prevent structural damage caused by water intrusion. Waterproofing an existing basement begins with excavating to the bottom sides of the footings. Once excavated, the walls are then power washed and allowed to dry.
Damp proofing is defined by the American Society for Testing and Materials (ASTM) as a material that resists the passage of water with no hydrostatic pressure. [1] Waterproof is defined by the ASTM as a treatment that resists the passage of water under pressure. [ 1 ]
Wall flashing is typically found at interruptions in the wall, such as windows and points of structural support. Sill flashing (or sill pan) A concealed flashing placed under windows or door thresholds to prevent water from entering a wall at those points. Roof penetration flashing Used to waterproof pipes, supports, cables, and all roof ...
Tar paper on a wall exposed by tornado damage in Oklahoma, used as a moisture-resistant backing for a masonry veneer exterior wall Tar paper is a heavy-duty paper used in construction . Tar paper is made by impregnating paper with tar , producing a waterproof material useful for roof construction.
Cement board is not waterproof. It absorbs moisture as well, but it has excellent drying properties. In areas continually exposed to water spray (i.e., showers) a waterproofing material is usually recommended behind the boards (i.e., plastic barrier) or as a trowel -applied product to the face of the boards behind the finish system (i.e ...