Weather, Vapor, and Air Barriers

Benjamin Obdyke bonds 1mm spacers to a trilaminate, nonwoven weather barrier to create a continuous drainage plane. HydroGap drains twice as fast as other drainable wraps, its maker says. With a 16-perm rating, the wrap is vapor permeable.

Cosella Dörken’s Delta-Vent SA self-adheres to reduce the risk of water infiltration at penetrations and to ensure tight seams. The three-layer, vapor-permeable air barrier resists water and sticks to concrete, OSB, and exterior-grade drywall.

Grace Construction Products’ Perm-A-Barrier aluminum vapor-barrier membranes seal around mechanical fasteners. The fully bonded system meets ASTM’s E2357 standard and complies with the National Fire Protection Association’s 285 test for walls with combustible air barriers.

For open-joint cladding systems, RevealShield is a black UV-stable, vapor-permeable, and water-resistant air barrier. It is installed with concealed, integrated tape at the horizontal seams, and the single-ply membrane can contribute to LEED points.

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