![]() ![]() Water resistive barriers are typically vapor permeable, which is generally desirable because it allows for drying of any moisture that accumulates in the wall assembly. Why Is It Important for Walls to Breathe? Polymeric water-resistive barrier are typically stronger than Grade D or felt building papers, thus they tend to have better durability than conventional building papers. Most commercially available polymeric-based water-resistive barriers are highly moisture-resistant and therefore, do not absorb water like typical Grade D or felt building papers. These materials consist of polymeric-based sheets (plastic) and can include spun-bonded (fibers), cross-woven (tapes), film (sheets) or a combination thereof.Ī water resistive barrier is different than Grade D building paper (paper-based). Water-resistive barriers come in a variety of widths and lengths as well as a variety of materials. Water will be channeled down the outside surface of the water resistive barrier, thus reducing the potential for condensation build-up in the wall assembly which reduces the likelihood of moisture problems, rot and degradation. Water resistive barriers resist bulk water penetration and wind-driven rain that penetrates the exterior cladding from intruding into the wall assembly. 38 mm) which is intended to resist liquid water that has penetrated behind the exterior cladding.Ī properly installed water resistive barrier (which includes proper flashing over doors and windows, continuity at seams, and sealing around penetrations) will improve the overall moisture efficiency and performance of the home or building’s wall system by providing a secondary moisture drainage plane. Energy Savings and Moisture Transport CalculatorĪ water resistive barrier is a thin membrane, typically 5 to 15 mils thick (.005 to 0.015 in.Evaluated Air and Water-Resistive Barriers.Whole Building Airtightness Technician Courses.Whole Building Airtightness Program (WBAP).Certified Air Barrier Specialists (CABS). ![]()
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