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Tuesday, 01 December 2009 14:43 |
 When manufactured wood I-joists are used in place of dimensional lumber joists in wood-frame construction, they must be supported properly so that they will not collapse under normal conditions. Photo 1 shows the most common method used to support I-joists from wood beams. The I-joists are set in galvanized steel joist hangers that are nailed to both the beam and the I-joists, with the tops of the I-joists flush with the tops of the wood beams. All of the nail holes in the joist hanger provided by the manufacturer must have nails to achieve the design strength of the system. The most common defect in I-joist assemblies is missing nails, which can significantly weaken the assembly and is often concealed by the floor deck above and a gypsum board ceiling below.
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Last Updated on Tuesday, 01 December 2009 08:46 |