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This paper, which is limited to the properties of water resistance and water vapor permeance, provides information that may be helpful in understanding, selecting, and using weather resistive barriers. Weather-resistive barriers (WRBs) are typically used in exterior walls of low rise frame buildings under claddings such as stucco (cement plaster), wood and wood derived products, vinyl (PVC), and masonry veneer. WRBs are primarily intended to provide resistance to water that may penetrate the outer cladding. WRBs also provide resistance to passage of air to varying extents but generally are moderately permeable to water vapor. Traditional WRB materials were limited to asphalt saturated felts and papers, but polymeric sheets have taken a growing share of the market in recent years.
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Conventional stucco, also called cement plaster, is a mixture of Portland cement, sand and water, to which plasticizers, traditionally lime, are often added to increase workability. In wood frame construction, stucco is usually applied in three coats over metal reinforcement (lath), with or without solid backing. Properly used, stucco is a desirable cladding material that is hard, strong, fire-resistant, rot and fungus resistant and durable. It adapts to any shape, is low in first cost and
has minimal requirements for maintenance. It remains one of the most popular cladding materials in the west and southwest United States. In spite of its many advantages, stucco has, when misused or abused, distinct undesirable characteristics that can cause or contribute to serious problems or construction failures. The undesirable result most often seen is water intrusion resulting in damage to structure or building contents. Read More