Housewrap as the first layer and cover it with Grade Dīuilding paper, which has a longer track record in direct Some contractors are starting to use plastic housewrap They are less flexible and more difficult to install. The heavier papers provide better protection, but Some contractors use as much as two layers of 60-minute The wetter theĬlimate, the heavier the paper should be. Two layers are necessary, since the stucco tends toīond to the outer layer of building paper or plastic housewrap,Ĭompromising its water repellency. One layer from direct contact with the stucco and creatingĪ secondary drainage space in the gaps between the two Two layers of 15- or 30-minute Grade D paper, isolating Water-resistance ratings ranging from 20 to 60 minutes,Īlthough the International Residential Code (IRC) does not specify a required ratingįor stucco underlayment, the trend in the industry is to use Grade D building paper is anĪsphalt-impregnated kraft-type paper, similar to the backingįrom new wood pulp, rather than recycled material. Paper rather than asphalt felt when applying stucco Traditionally, stucco contractors have used Grade D building Our photograph of a modern stucco exterior shows how stucco is used in the southwestern U.S., in this case Marana, outside Tucson, AZ. This article series includes excerpts or adaptations from Best Practices Guide to Residential Construction (found at page bottom, Click to Show or Hide), by Steven Bliss, courtesy of Wiley & Sons. This article series discusses best practices construction details for building exteriors, including water and air barriers, building flashing products & installation, wood siding material choices & installation, vinyl siding, stucco exteriors, building trim, exterior caulks and sealants, exterior building adhesives, and choices and application of exterior finishes on buildings: paints, stains. The underlying structure is more vulnerable to moisture Trapped water cannot readily drain away or dry to the exterior, Newer synthetic systems are less permeable to moisture. Walls were designed to get wet and readily dry out, the Without aĬontinuous drainage plane, stucco systems are subject to Perforated flashing at the bottom of the wall to safelyĭrain away any trapped water at the foundation. In addition, stucco systems need a weep screed or similar With all flashings at doors, windows, and other The same as under other exterior claddings, withīuilding paper layered to shed water and carefully integrated The drainage plane under stucco is essentially
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