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the building envelope AIA CONTINUING EDUCATION 1 2 Common brick masonry problems include corrosion of steel shelf angles (1), mortar joint failure (2), efflorescence (3), and insufficient expansion joint width (4). Of all the problems associated with brick masonry construction, those resulting from water penetration are the most common. 3 4 load-bearing high-rises, with their thick, stout walls. With multiple layers, or wythes, of brick bonded together, these historic masonry walls relied on the unifi ed structural capacity of the wall thickness to withstand horizontal and vertical forces and to provide weather protection. In contrast, modern brick veneer cavity walls anchor a single wythe of face brick across an air space, typically two to four inches wide, to a backup material. Part of a drainage system that includes fl ashings, drip edges, and weep holes, the air space creates a pathway for moisture to exit the wall assembly, while a steel, concrete, or masonry backup provides structural support. What may seem on the outside to be a wall composed of a single material—clay brick—is actually a composite wall system, with materials ranging from steel and concrete to fl exible fl ashings and sealant, in addition to traditional brick-and-mortar elements. How and where these materials come together, and why they behave the way they do, is of critical importance to the weather protection, integrity, and longevity of the wall assembly. As modern masonry construction has grown increasingly complex, so too has the design, detailing, and installation of brick cavity walls become more demanding. Where once a skilled mason was all it took to achieve a durable exterior wall, proper construction now demands the efforts of numerous tradespeople working in collaboration with the design professional to achieve a watertight, structurally stable, aesthetically appealing masonry exterior. Prevention of water infi ltration, structural failure, and other woes by means of appropriate design and meticulous workmanship is the ideal, but for existing buildings, the mission becomes timely and accurate identifi cation of emerging problems, with repair strategies that provide lasting solutions. 72 MAY 2016 BUILDING DESIGN+CONSTRUCTION www.BDCnetwork.com
500 colors 20 sizes Carmel, IN 13 textures Unlimited shapes St. Catherine’s Medical Center beldenbrick.com PROVEN PERFORMANCE, ENDLESS POSSIBILITIES The Belden Brick Company is privileged to serve our customers with more options than any other brick manufacturer in the world. As the industry leader in delivering the largest selection of more than 500 colors, 20 different sizes, 13 textures and unlimited shapes, Belden will meet all your product needs with the timehonored quality and experience we’ve mastered since 1885. The Standard of Comparison Since 1885 Private Residence Circle 788 An ISO 9001 Compliant Quality Management System. An ISO 14001 Compliant Environmental Management System.
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