Expansion Joint in Brick Wall

weakness in the surface, where cracking or crushing would tend to occur if no joints were provided. D>

4. Aluminum cladding components are subject to large amounts of expansion and contraction caused by daily and seasonal differences in air temperatures and by direct solar heating of the metal. Both horizontal and vertical expansion joints must be provided at appropriate intervals. Each joint must be designed to maintain the alignment of the components and to keep out weather while allowing for movement. In this example, vertical movement is accommodated by a sliding mullion connection at every other floor of the building and by the movement of the spandrel glass into and out of a deep recess in the horizontal mullions.

5. In aluminum cladding systems, horizontal movement may be taken up by vertical mullions that are split or that have a bellows action. It can also be accommodated by sliding connections where each horizontal mullion piece joins the verticals, and by glass movement in and out of the vertical mullions.

6. Suggested maximum expansion joint spacings are 30' (9 m) for gypsum and gypsum/lime plaster, and 200' (60 m) for brick masonry. Expected moisture movement of these materials can be quantified by using the procedure shown on page 77. Expected amounts of total movement in each joint can be calculated by following the procedure outlined on pages 35 and 36. ■

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