Can Your Water-Resistive Barrier Take UV Exposure?

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A recent report shows alarming degradation of water resistance in some WRBs after exposure to ultraviolet radiation

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A water-resistive barrierSometimes also called the weather-resistive barrier, this layer of any wall assembly is the material interior to the wall cladding that forms a secondary drainage plane for liquid water that makes it past the cladding. This layer can be building paper, housewrap, or even a fluid-applied material. (WRB) provides protection against water damage for water that gets behind the claddingMaterials used on the roof and walls to enclose a house, providing protection against weather.

of a building. But what if it doesn’t really resist water? I’ve written a lot about installation problems that can lead to compromised water resistance. (See the article I wrote last week, for example.) But other factors can make them leaky, too. Too much exposure to ultraviolet (UV) light is one of them.

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[source: http://www.greenbuildingadvisor.com/articles/dept/building-science/can-your-water-resistive-barrier-take-uv-exposure]


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