Drainable housewraps may seem like a silver bullet - better than siding installed tight to a standard smooth-faced housewrap and less complicated than furring strips or other ventilated rain-screen systems - but don’t mistake drainage for airflow. Providing airflow and drainage behind a home’s siding keeps moisture issues under control, extending the life of your paint or stain, the siding itself, and the structure beneath. You can guess how the story ended: lots of builders dealing with catastrophic cases of rotten sheathing.” Around the same time, builders started switching from plywood sheathing to OSB sheathing, which is more moisture sensitive (see The Mold Explosion: Why Now?).
Over time, however, the manufacturing methods for building paper changed, and a single layer of the newer paper maintained its bond with the stucco rather than debonding like the old stuff as a result, the drainage space wasn’t created. Scientists realized later that the reason why this single layer worked so well is that as the stucco dried, it debonded from the building paper and left small gaps, which allowed water to drain away. Decades ago, builders installed a single layer of asphalt-impregnated building paper over the wall sheathing to protect against this moisture. Warmth from the sun pushes moisture from the surface of the stucco farther into the wall, where it can sit against the sheathing and lead to rot. Justin Fink – Fine Homebuilding: “Stucco is a so-called reservoir cladding, which means that it can absorb and hold water. In terms of moisture, anchored masonry veneer isn’t much different than stucco.īuilders have learned a lot of hard lessons about stucco over the years and unfortunately many are repeating the same mistakes when working with thin masonry and stone veneer. Some say it’s stucco with chunks of concrete stuck in it. Adhered concrete masonry veneer (ACMV) has also been called “manufactured stone, “lick and stick,” “cultured stone,”, and” faux stone”.
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