Cantilever Steel Deck Framing

While it will be years before the 2015 version is widely adopted by local codes many building officials often accept future provisions like these as easy to approve alternatives to costly engineering.

Cantilever steel deck framing.

Deck joist cantilever rules and limits the distance your joists can safely cantilever or overhang a drop beam is determined by the size of the joists the wood type and grade of the lumber and the spacing between joists. When done correctly this is a strong and code compliant method of building. With the allowable cantilever of the joists this beam would support a deck 12 feet by 17 1 2 feet. Trex elevations is a revolutionary steel framing system that provides a long lasting non combustible ultra reliable foundation for your deck boards.

This framing style is called post and beam and the overhang is a cantilever. The single most important framing member is the ledger board. When this system of connections is made properly loads are transferred. Cantilevered deck frame instead of a girder at the end of the joists you ll need to put a beam under the joists so they can extend past that support.

An unparalleled three layers of protection surround a carbon steel core ensuring each critical joist beam and ledger connection holds up to the elements for decades with a 25 year limited residential warranty to prove it. Once installed it acts as a guide for a deck frame that s level and square. It s a good idea to mark joist locations on the ledger and on the front facing rim joist before installation when you can lay the framing members side by side on a pair of sawhorses. Around alabama where eht is headquartered most decks are connected to the side of a house with a ledger board fastened to the rim joist of the house.

Deck builders and building officials occasionally react to this by asking why g90 is okay for framing while g185 1 85 ounces of zinc per square foot is required for framing hardware. Lgs framing for decks is typically galvanized to the g90 standard 0 9 ounces of zinc coating per square foot of steel sheet. Section r507 5 notes that deck joists can cantilever up to 1 4 of the joist span. Build a freestanding cantilevered deck supported by parallel beams.

But you ll notice when you look at the portion of the span table for joists with cantilevers that the joist span for decks with a cantilever is often less than the span for the same sized joist without cantilevers.