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In wet climates, lightweight units should not be exposed to weather but should be treated with opaque coating. Maximum resistance to rain penetration is achieved when an opaque, elastomeric coating is used.To make walls more weather resistant, consider the following: Careful attention to moisture management is necessary.
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Use Flashing and weep holes where required. Add a layer of rigid insulation at the interior wall face as a moisture barrier and to provide additional R value.Type S Mortar is required for areas of high seismic risk: check with your structural engineer to determine what is required for your region.Understand that some form of horizontal reinforcement is required in all concrete masonry construction, including veneer applications. The use of reinforced bond beams can replace the necessity for joint reinforcement in concrete masonry walls.Check with your structural engineer to determine what is required in your region. Structural masonry walls in areas of high seismic risk are required to have additional horizontal bond beams to resist seismic loads.In other parts of the country, medium weight and normal weight block are more common. have good local sources for lightweight aggregate, and the use of lightweight concrete block (CMU) is the norm. (See Masonry & Ceramic Tile Institute of Oregon: In these applications, an opaque elastomeric coating is used to form a weather barrier on the outside wall face.
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