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Ecotone concrete rainscreen4/30/2023 ![]() Other options include plastic mesh and textured or “bumpy” housewraps. Many builders use vertical wood furring strips that are made on-site and attach directly to the studs. There are several ways to create the air gap. A gap as small as 1/ 16 inch will provide a capillary break however, most rainscreen assemblies include an air gap that is at least ¼ inch and up to 3/ 4 inch wide. This is because air rises as it is heated, a phenomenon known as the stack effect. An assembly that includes ventilation at both the top and bottom of a wall can dry out more quickly. The air gap creates a path for liquid water to drain out of the envelope it also creates a capillary break between the cladding and the WRB. Some systems work to force air through the wall cavity/air gap to moderate the pressure differential between the exterior and interior wall, thus reducing the amount of moisture that is drawn into the building. The internal air gap and WRB ensure that any water that makes its way in either evaporates or is drained through the gap and back outside. These components work together to protect the structure by controlling external moisture so that it does not reach the building’s substructure.Ī rainscreen assembly helps keep water out of the building interior by providing a barrier against the water outside and controlling any water that makes it past the cladding. Some rainscreen systems only include vents (or “weep holes”) at the bottom of the assembly, while others include vents at both the top and bottom of the wall. The rainscreen assembly also must include openings or vents that connect the air gap to the outside. While some refer to the air gap and others to the cladding material when discussing rainscreens, in actuality, a rainscreen is a system that includes three essential components: the exterior cladding (the “screen”), a sealed air gap, and a water-resistive barrier, or WRB. This strategy not only enhances the durability and longevity of the building, but it also contributes to the health and well-being of occupants. This space helps to create a capillary break and provides a path for moisture to exit the building envelope. Available in many organic colors, thin, light, and durable extruded concrete panels can be part of an effective rainscreen system.Ī rainscreen is an exterior wall detail in which the exterior cladding or siding is installed with a small air gap between the cladding and the rest of the wall assembly.
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