Deck Joist Cantilever Rules and Limits | Decks.com
Many building departments limit joist cantilevers to 24" maximum. You must use at least five framing nails to attach the rim joist to the ends of your joists. The American Wood Council states that cantilevers are limited to 1/4 the span of the joists. Maximum allowable overhang cannot exceed 1/4 of the actual main span.