Concrete block rebar3/24/2024 ![]() Be sure to include regular expansion joints and horizontal joint reinforcement to minimize shrinkage cracks.Or, consider fully grouting all cells to make a barrier wall system.In high seismic areas where the walls are reinforced and grouted, the use of internal wall Flashing is impractical. Remember to design weeps and weeps at the base of walls, over openings, bond beams, and other features that might tend to collect water within the wall.Include good sills and good wall caps to minimize moisture infiltration.Use white Portland cement or marble chips to achieve color variations rather than pumice, which is very porous and absorptive.An opaque elastomeric coating can be used to weatherproof these types of units. These block types are very difficult to protect with spray-applied water repellents. Avoid using highly permeable units, such as split face, ground face, and lightweight units that use pumice aggregate.This system must also include a water repellent admixture used in the Mortar as well as a high grade, deep penetrating, breathable water repellent applied to the exterior surface of the wall. Medium weight units that are manufactured with integral water repellents perform best in creating a moisture resistant system.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.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. Designers in the Pacific northwest have learned how to use single-wythe concrete masonry walls effectively for shopping centers, restaurants, hotels, schools, fire and police stations.
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