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Concrete block walls3/24/2024 Cut down on the number of shelf angles to save money and simplify your construction. Shelf angles may not be required for veneer support at every floor line. ![]() Don’t forget to detail expansion jointsin the brick veneer and control joints in the concrete block backup. Brick veneer expands as it ages, whereas concrete block shrinks.It is penetrated only by thin 9-gauge wire ties to anchor the veneer. It is important to note that this rigid insulation is continuous. This raises the R-Value of the wall from 11.7 to 21.5. You can improve the R-value of this wall by substituting 3” foil-faced polyisocyanurate for 2” expanded polystyrene insulation in the cavity.The reason? If you use 1.5” insulation, coupled with a 1” air gap (required by Code), the entire wall can fit on a standard 14” wide foundation if you cantilever the brick a modest 1/8” over the edge of the foundation. Our sample design uses 2” insulation in the cavity, but many designers choose to use 1” insulation.Place rigid-board insulation in the drainage cavity to maximize interior usable space, and take advantage of the huge thermal mass provided by the masonry backup system.Sustainablility / Green Building Design.Sustainable Concrete Masonry - Assuring a Healthy Future One Block at a Time.Regional material (where applicable) 2 pts.Energy efficiency, thermal comfort and energy analysis – up to 10 pts.Use either thicker insulation or more expensive polyisocyanurate to achieve a higher energy rating. Extruded polystyrene yields 5.0 R per inch (7.5 R for 1.5" or 10 R for 2"). Expanded polystyrene insulation is worth 4.0 R per inch (6.0 R for 1.5" or 8 R for 2"). Polyisocyanurate insulation gives you 8.0 R per inch (12.0 R for 1.5" or R16 for 2"). Note: The type of rigid insulation you install affects the wall’s insulating capacity (the R-value). Thermal Mass Advantages of Masonry Walls.R-value: 13.71 using 2" extruded polystyrene insulation (see note below) R-value: 11.71 using 2" expanded polystyrene insulation (see note below) STC=(weight of wall) 0.223x21.5 Wall Weight (lb/sq. Fire Endurance Ratings of Clay Brick Masonry.Fire Resistance Ratings of Concrete Masonry Assemblies.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 forjoint 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. Check your local requirements – and save money by using normal veneer ties in areas of low seismic risk. When masonry veneer is used in areas of high seismic risk, veneer ties are required to attach to the wire reinforcement embedded in mortar bed joints in the veneer.Joints: concave tooled Regional Variations ![]() Mortar: Type N, Portland cement/lime, plain gray Veneer ties: Adjustable pintle and eye veneer ties Insulation: 2" rigid expanded polystyrene in drainage cavity Veneer: Modular clay brick 4" x 2-1/3" x 8"(nom.) 9-gaugejoint reinforcement/wall ties at 16" o.c. Reinforcement: #6 vertical reinforcement 32" on center. This substantial wall system may require larger foundationīackup: Lightweight plain gray concrete block (CMU), 8" x 8" x 16" (nom.).Lower life cycle cost offsets higher initial investment. ![]()
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