Why Use a Spray-Applied Water-Resistive Barrier?
A liquid WRB won’t blow off, it goes on fast, and it's an economical way to make a house airtight and waterproof.
Synopsis: There are several ways to add a water-resistive barrier (WRB) to a house: attach housewrap to the sheathing, use sheathing panels with an integral WRB, or attach a fully adhered WRB to the sheathing. In this article, Andrew Hall describes the method his firm uses—a spray-applied product that not only provides water resistance but enables the builders he works with to achieve the airtightness requirements in the 2012 IRC with very little additional air-sealing. Hall provides an overview of how the product is applied first to seams and corners, and then to the field. Senior editor Patrick McCombe adds a brief analysis of the relative costs of the different methods of installing a WRB.
My company does a lot of work in and around Boston, an area that’s been undergoing a residential building boom for almost a decade. When I drive around, I routinely see single-family and multifamily homes…