Using Expansion Joints Greenville SC
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Using Expansion Joints
Source: MASONRY CONSTRUCTION MAGAZINE
Publication date: May 1, 2005
I am working on the design of an eight-story medical center that has 14-foot floor-to-floor heights. The wall construction is brick veneer with steel stud backup. The windows are either individual punched openings or larger groups that span a width of 30-feet horizontally. The heads of the windows are located 8-feet above the floor line. There are continuous shelf angles at the floor lines throughout the building. To support the masonry of the windows, we used loose-laid lintels at the individual openings and suspended lintels at the wider openings.
Are vertical expansion joints needed at both sides of the masonry at the areas where the lintels are hung since the masonry above the windows is supported by the floor above, whereas the masonry on either side is supported on the floor below?
Whenever there are different supporting conditions in adjacent areas of masonry veneer, these locations need to be isolated with vertical joints so that they are free to move independently. In the case of loose-laid lintels, all the masonry is supported on the floor below and there is no problem. However, when the masonry over the windows is attached to the structure above, vertical expansion joints must be provided to isolate the masonry above the windows from the masonry on either side, In this case, the lintel angles should not extend into the masonry at the jamb of the windows.
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