House Wrap As Vapor Barrier For External Concrete Walls

R703 1 1 the exterior wall envelope shall be designed and constructed in a manner that prevents the accumulation of water within the wall assembly by providing a water resistant barrier behind the exterior cladding and a means of draining to the exterior water that penetrates the exterior cladding r703 2 water resistive barrier.

House wrap as vapor barrier for external concrete walls.

This thin mil seamless substrate coating can be applied with an approved airless sprayer power rolled or hand rolled. While house wrap is water resistant it typically is not water impermeable or waterproof with good reason. After the insulation is in place you will want to add a vapor retarder sometimes called a vapor barrier if you need one. Not every wall does.

Polywall blue barrier liquid wrap 2300 is a spray applied fully adhered permeable air and moisture building envelope protection membrane developed utilizing the latest in silyl terminated polyether technology stpe. Very hot and humid climates may benefit from an exterior vapor barrier that keeps outside humidity from penetrating into walls. Vapor barriers are put on the inside face of wall studs in cold climates and they re put on the exterior of homes in hot and humid climates. Whether or not you need a vapor retarder hinges on three main factors.

Above grade exterior walls with semipermeable exterior finishes like brick over oriented strand board sheathing require the placement of an additional vapor barrier on the exterior side of the. Below grade walls and floor slabs transmit ground moisture through concrete walls or slabs. As a result it can contribute to improved building durability by helping to protect homes against damaging wind and rain that can penetrate the exterior cladding. When building exterior walls with stone stucco brick when building exterior walls with stone stucco brick cedar eifs or fiber cement siding it is important to use an effective rain screen system that will provide a means for drainage and ventilation.

The purpose of using house wrap is to prevent the entry of moisture into the wall cavity from outside. Moisture will find its way into these wall systems by way of cracked mortar joints gaps or cracks in the surface of the material. You want the vapor barrier as far away from the cooler wall surface as possible. House wrap technically is a type of water resistive barrier or wrb.

Dupont tyvek homewrap is the original house wrap incorporating unique material science that helps keep air and water out while letting water vapor escape.