Air Barrier

VaproShield®, a provider of innovative, breathable membrane systems for roofs and walls, has announced the release of SlopeShield Plus® Self-Adhered, a highly vapor-permeable roofing underlayment air barrier material. SlopeShield Plus Self-Adhered is designed for use on steep-slope roofs of 2:12 or greater pitch. The revolutionary roofing underlayment features the patent-pending Vapor Permeable Polymer Composite Technology™ (VPPCT) developed by VaproShield.

VPPCT combines advanced polymer coatings and VaproShield’s proprietary adhesive to create a primerless, highly permeable, and fully adhered roofing underlayment. The black color absorbs heat from the sun, while exposed, which increases the drying process of wet sheathing and insulation.

The development of SlopeShield Plus Self-Adhered came from an existing market demand for a high-performance and permeable roofing underlayment. Traditional asphaltic and butyl-based peel-and-stick roofing underlayments offer liquid-water holdout but lack drying capacity due to their non-permeable nature. These underlayments inherently trap moisture, reducing insulation performance and accelerating sheathing decay, potentially causing premature roof assembly failure.

SlopeShield Plus Self-Adhered offers superior performance to the polypropylene tri-laminate micro-porous permeable existing roof underlayments. The innovative construction technology of SlopeShield Plus Self-Adhered is a composite of polymers and polyester in a sheet that allows vapor diffusion. The design of SlopeShield Plus Self-Adhered eliminates the water leakage created by the concussion effect, caused by heavy rain and foot traffic, while allowing for six-month UV and climate exposure prior to the roof system installation. SlopeShield Plus Self-Adhered is compatible with metal roofing, slate/clay tile with batten/counter-batten substructures, and cedar shingles/shakes with VaproMat™. VaproShield offers SlopeFlashing™ in 29-1/2” and 19-2/3”. SlopeFlashing is used to flash eaves, hips, ridges, and valleys.

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