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Insul-Barrier is a multi-layer crawl space wall blanket that combines insulation and a vapor barrier in one roll. It pairs cross-woven polyethylene, closed-cell foam, bubble insulation and reflective aluminum, giving an R-8.73 material value that reaches up to R-12 in a ¾-inch wall system. Its 0.002-perm permeance and Class A rating make it a genuine vapor retarder, not just a thermal layer. It suits DIY crawl space encapsulation where you want wall insulation and moisture control from a single product, rather than separate foam board and plastic sheeting.
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Insul-Barrier is a multi-layer blanket insulation that insulates crawl space walls and protects against moisture and water vapor. It is meant to be used as part of a complete crawl space encapsulation system, on foundation walls.
It is built from cross-woven polyethylene, high-density closed-cell foam, high-density polyethylene bubble insulation, and reflective aluminum. The reflective layer gives it radiant-barrier properties. It is a flexible alternative to rigid insulation panels and arrives ready to install, with no inflating needed.
The material itself has an R-value of R-8.73. For a higher installed value, leave an air gap between the foundation wall and the barrier. One method uses vertical strips of closed-cell spray foam about every 16 inches to hold the barrier off the wall. With this wall system, the installed assembly can reach R-10 to R-12, depending on the finished wall and the installation. You can trim the material to your wall height and layout. Seal any cut edge with appropriate seam tape.
