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How Important is a Rainscreen? The primary function of rainscreen is to provide protection to external walls of any structure from rains as well as other climatic changes. Rainscreen diverts rainwater’s direction and because of that, it saves the building from moisture problems. Covering one material using another is basically what meant by the process of cladding. The surface of the material that is about to be covered is usually finished and cladding provides protective coating to it. To be able to drive away the water from surface, the external wall or roof of any building is sheltered by adding a new layer. Cladding for rainscreen can be manufactured using glass, masonry, metal, wood or stone. Cladding can help in reducing the force to which the rain hits the surface protected while the cavity at its back is reducing thrust in rainwater over a support wall. In general, cladding has porous nature and has vents within, which facilitates airflow to the cavity and therefore, prevents moisture from building up in the cavity. Aside from that, airtight supporting wall together with its covering of rigid coating of waterproof material ensures that the moisture won’t cause harm to the structure. As a matter of fact, the simple and pressure equalized rainscreens are the 2 classifications of rainscreens.
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In the former, the varieties are quite a lot especially for areas that experience low rainfall. Cladding of simple rainscreen is actually vented while the support wall is covered with waterproof material which is airtight. The base of wall usually has a drain and one common example for this type of rainscreen is the brick masonry finish above concrete wall.
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On the other hand, a more advanced pressure equalized rainscree is what used in structures that are experiencing heavy rainfalls. The principle for this work in is that, as the rainstorm strikes the building, vents in cladding let the air contained in cavity to bang against the layer of air barrier of the support wall. And primarily because of balancing of outer as well as inner pressure, it helps in preventing moisture to enter from the structure. The balancing of two pressures on the other hand can actually work better in theory than in practice. It helps a lot however in compartmentalizing the cavity. To prevent rainwater from piercing through cladding even further, the size of joint delivers exceptional results. It is important to get quality sealants and drainage layers as well over support walls to get the best results and to be sure that the pressure balancing system is working efficiently. Rainscreen keep external walls of any building to be strong for extended period of time, making it extremely important.