The International Residential Code, the American Wood Council’s DCA-6 Prescriptive Residential Wood Deck Construction Guide, and other standard industry publications all do not permit or recommend the attachment of a deck ledger to any cantilevered floor system, be it solid-sawn, I-joist, or floor trusses. But we still see examples of just this practice, sometimes following guidance from I-joist and floor-truss manufacturers. In this article, we will explain some of the technical obstacles facing a homeowner and deck contractor when considering the addition of a deck to a new or existing home with a floor system built with open-web floor trusses, with a particular focus on the structural problems that arise when attempting to fasten a deck ledger to cantilevered trusses.

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