“We have recently noticed a green board on the exterior of some homes under construction. Would you explain the purpose of this new product?”
Most likely, you have seen a type of WRG (water-resistive barrier). But before I put my building geek hat on, allow me to back up and explain what a WRB is and why we need one in the first place.
No matter how carefully it is applied, siding, brick, stucco, or other siding is likely going to leak at some point in its service life. The layer beneath the siding-the water-resistive barrier, or WRB-is what will protect the wood framing in your home from rot and mold when water sneaks in through the exterior cladding.
