Above: Squash blocks installed to support load from above. Right: Load from above without squash blocks or blocking panels caused this web to buckle.
LeakBarrier SS400 Ice and Water Armor
Lightweight self-adhesive, modified bituminous roofing underlayment
LeakBarrier SS400 Ice and Water Armor is a surprisingly lightweight self-adhesive, modified bituminous roofing underlayment. It's reinforced with a heavy weight fiberglass mat for use under tile, slate and asphalt shingles. Glass fiber reinforcement on the upper surface provides enhanced skid resistant properties. For FREE information, visit http://pb.hotims.com/23726-268