Now, any water that gets past the siding and runs down the surface of the drainage plane (housewrap) will be directed to the outside of the apron flashing and then onto the roof.Ĭontractors tape is the fastener that holds the drainage plane layers in place and is not a substitute for properly lapping the layers shingle fashion. The new strip of housewrap should extend over the roofing felt and flashing as shown in the photo of the completed apron flashing.Ĭontractors tape is used to fasten the strip of housewrap where it tucks under the existing housewrap and also to hold it against the metal apron flashing until the siding has been installed over it. To avoid damage to the home, this can be corrected (photo 2):īefore the siding is installed, cut the housewrap horizontally above the roofing felt and slip another strip of housewrap up under the existing housewrap on the wall (shingle fashion). If they are not overlapped properly, or reversed, water may be directed into the building and result in a failure.Įvery element of the drainage plane must be installed so it will direct water out and over the layer below it. Starting at the foundation, every element of the drainage plane must be installed so it will direct water out and over the layer below it in the same fashion as the overlapping of shingles on a roof. The outside surfaces of windows, doors and skylights are also part of the outer surface of a building and must be carefully integrated with drainage plane components. Weather resistive barrier (housewrap or building paper).The foundation (footings and walls) drainage system.It should cover the entire house from bottom to top and includes: This protective layer is often referred to as the drainage plane. On the exterior of homes, building materials that can't stand up to repeated exposure to water must be protected by another layer. Drainage planeĪnother factor that contributes to the durability of homes is their ability to resist Minnesota weather. While some composite materials are more durable than traditional framing and sheathing materials, others are less durable and are not able to survive wetting and drying cycles as well as dimension lumber. One reason is the difference between the dimension lumber used to construct older homes and the growing number of composite materials used in newer frame construction. There are a number of reasons why older homes have endured the test of time. As a properly applied interior window sealant, AirDam can substantially reduce a building’s heating and cooling costs.While we may complain a little about the comfort and energy costs of older homes, we also speak with reverence of their durability. Appropriate for exterior or interior use, AirDam is easily applied with standard caulking tools.ĪirDam bonds tenaciously and can be used with all types of window and door frame material – vinyl, wood or metal, including painted metal. AirDam cures quickly to produce a durable, high-performance, high-movement, elastomeric sealant. This single-component, silyl-terminated polymer (STP) is easy to gun and tool in all weather conditions.ĪirDam is immediately waterproof and can be applied in unfavorable weather conditions to dry or damp substrates, eliminating many weather-related construction delays and accelerating the “drying in” of new buildings. This ensures wind-driven rain and condensed water are diverted to the flashing membrane and water-resistive barrier before it can enter the living space. Installed as the interior air sealant, AirDam creates a long-lasting, weather-tight seal that prevents moist outside air from entering, and conditioned indoor air from escaping around window and door assemblies. R-Guard AirDam is a gun-grade waterproofing sealant combining the best of silicone and polyurethane properties.
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