A weather-resistant barrier (WRB) is a material that is used to protect the building envelope from moisture intrusion caused by rain, snow, wind, and other environmental factors. The WRB is typically placed on the exterior of the building beneath the cladding or siding.
The purpose of a WRB is to prevent moisture from penetrating the building envelope and causing damage to the structure, insulation, and other materials. It also allows water vapor to escape from the building to prevent the buildup of moisture, which can lead to mold growth and other issues.
The most common types of WRBs include building wrap, housewrap, and felt paper. These materials are typically made from water-resistant and vapor-permeable membranes that are designed to withstand the elements while allowing air to circulate.
In building design, the WRB is considered a critical component of the building envelope. It is typically installed early in the construction process and is followed by the installation of insulation, sheathing, and cladding. The WRB helps to ensure that the building is weather-tight and energy-efficient, while also protecting the structure from damage caused by moisture.
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