The 2-by blocking used to reinforce this cantilevered I-joist has been split by the lag screw connecting a PT deck ledger to an engineered rim joist. Under substantial load, the split blocking will tear off the bottom flange of the I-joist and cause the remaining I-joist section to fail.
Frank Woeste The 2-by blocking used to reinforce this cantilevered I-joist has been split by the lag screw connecting a PT deck ledger to an engineered rim joist. Under substantial load, the split blocking will tear off the bottom flange of the I-joist and cause the remaining I-joist section to fail.

Q. When I-joists are cantilevered over the foundation wall rather than directly supported at the sill plate, can a deck ledger be safely attached to the engineered rim joist?

A. Frank Woeste, P.E., professor emeritus in the Department of Biological Systems Engineering at Virginia Tech University, Blacksburg, responds: While most I-joist companies publish fastener schedules and details for attaching deck ledgers to code-approved engineered rim boards, these details assume that the I-joists and rim boards are...

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