Does UV exposure damage building paper?
Not significantly. Building paper’s strength comes from wood fibre and we all know that exposed wood can withstand decades of UV exposure. Similarly, asphalt in roads and roofing withstands decades of UV exposure. The same asphalt is used in building paper. Our laboratory testing has confirmed the above historic evidence. At worst, UV and rain exposure can make building paper’s appearance look weathered due to the bleaching action of these elements.
