The launch of our new Xci self-adhering weather resistive barrier, Xci VP-SA WRB, is a great opportunity to talk about the benefits of protecting wood composite panels on exterior walls with a barrier that is vapor permeable (10 perms or more). Wood composite panels made with polyiso have big advantages when it comes to exterior wall assemblies. They provide a high continuous R-value and a convenient attachment surface for almost any cladding option. In some applications, they can even be used as structural sheathing. To maximize performance, they need to be properly protected on the wall.
After the panels are installed, the wood exterior should be covered with a barrier that will resist air and water while permitting the transmission of vapor. This allows any moisture in the wood to be able to dry to the exterior. The barrier, which can be self-adhered, spray-applied, or mechanically attached, will cover all seams and panel fastener penetrations, with no need for taping. Self-adhering options, such as Hunter Panels' new Xci VP-SA WRB, can have the benefit of providing a simple, effective barrier solution that does not require special equipment or additional penetrations caused by mechanical fasteners.