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I-joists require blocking at end supports to prevent joist rollover. Short pieces of I-joist work well and provide good shear blocking for diaphragm designs (top). Where a ventilation channel is needed,use metal cross-bracing (second from top), dimension lumber (third from top), or notched engineered rim joist material (bottom).

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Though a beveled plate requires special fabrication, it has some advantages over cutting a birdsmouth.Headers at openings may require double joists, depending on the loads. Use filler blocks between the I-joists and a backer block to support the hanger.