Vaporstop® 398

Vaporstop 398 is used as a vapor retarder on all types of roof decks to protect the insulation from possible condensation damage. The product may be used where compliance is required by Factory Mutual and Underwriters Laboratories. It is intended for use on non-sloping or nominally-sloping built-up roofs, not to exceed a slope of 1-in-12, or mechanically attached metal roofs.

Vaporstop 398 is a lamination of two layers of high strength kraft, black polyethylene laminate, and 2-directional glass reinforcing fibers. It is edge-reinforced for additional strength.