in wood framing construction, underhang refers to the maximum distance a header or lintel can fall short of the vertical load bearing member (referred to as trimmer or jack stud) and still transfer the load through the furring member in shearA 39-inch Rhino Header can be installed in a 43-inch rough opening because it has a 2-inch underhang.
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Jeffrey Watts from United States on 29/06/2018