Designing and constructing structures that avoid the detrimental effects of wind-driven rain creates a significant challenge to architects and contractors. One of the largest sources of moisture for above-grade walls comes from wind-driven rain. Failure of the building enclosure to stop the rain from infiltrating the wall system can lead to mold and mildew. Mold and mildew in the wall system creates an unhealthy environment for the occupants and can degrade the durability of a structure.
Contractors and architects can stop the damaging effects of wind-driven rain by incorporating four basic methods into a building’s design. First, builders must apply techniques to deflect the rain. Next, they should ensure moisture that isn’t deflected drains properly. Third, the design of the building enclosure must allow the moisture that does not drain to dry by including a breathable weather-resistant barrier (WRB), like Barricade® Wrap Plus. Finally, contractors should choose durable building products that maintain their integrity while quickly drying.
Builders can minimize the harmful effects of wind-driven rain by designing a building and its surroundings to deflect the moisture.
Even with excellent deflective measures, some rain can make its way onto a wall. Contractors must install effective drainage systems to drain the water off the building as soon as possible.
A high-quality vapor-permeable WRB, placed over the sheathing and behind the siding, allows moisture that infiltrates the wall system to dry. The WRB also supplies a building’s second defense against bulk water penetration. Crucial components of a high-quality WRB include durability, high tear strength, ultraviolet-resistance, and ease of installation. A WRB should comply with the 2018 International Building Codes (IBC 1402.2) requirements for water-resistance and vapor permeability in addition to the 2018 International Residential Code for water resistance (IRC R703.1.1).
Barricade® Wrap Plus contains all the components of a high-quality WRB that can help architects and contractors design and build structures that avoid the detrimental effects of wind-driven rain.