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movement that should not be overlooked in joint design is differential movement due to thermal expansion and contraction of materials. Last and most often overlooked in the development of building details is acknowledgment of building material fabrication and erection tolerances. Tolerances are generally established by industry trade organizations. As a simple example: The construction tolerance for placement of masonry is +/- J inch vs. +/- G inch in precast. A minimum G-inch sealant joint is recommended for performance. Without also looking at the window fabrication tolerances, this suggests a minimum design joint of K inch at masonry and H inch at precast.
Best Practice for Detail Implementation In an August 2006 meeting of the Houston chapter of the Building Envelope Council, a panel including an architect, a roofer, a window installer, an owner and general contractor were challenged to identify methods and actions that were most effective at minimizing the opportunity for problems developing in the exterior enclosure. (See p. 92 sidebar on Building Enclosure Councils.) The panel achieved consensus on the importance of the following: • Building “technical” exterior mockups that include the most common building details to prove out the details and the craftsman’s techniques. • Conduct preconstruction conferences on exterior systems to establish common understanding, share issues and concerns, and agree on expectations. • Conduct appropriate industry standard tests such as window water test during construction to verify performance. The most important consensus was the recognition that each party involved in the design, fabrication, and construction made important contributions to the performance and ultimate success of the construction.
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Conclusion Successful protection against moisture intrusion requires coordination of moisture barriers across all the building assemblies to achieve a high level of continuity with a particular focus on the appropriate design of the details at the intersections and transitions between the moisture barrier systems. A principal with Morris Architects, Andy MacPhillimy, AIA, chairs the Houston chapter of the Building Enclosure Council.
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Published on Oct 18, 2011
Published on Oct 18, 2011
Texas Architect is the official publication of the Texas Society of Architects, each edition features recently completed projects and other...