Girdered Roof Deck

Recommended beam joist spans for deck framing.

Girdered roof deck.

As beautiful as they are functional the modern deck roofs are an extension of and not a deterrent from the luxurious deck. Typical decks are designed to support 55 psf lbs per square foot. This type of steel roof deck is available in prime painted and a galvanized finish. Cantilevered beams are stronger than flush style beams because they rely on the strength properties of the wood rather than the individual mechanical and fastener.

As a result most decks have inadequate footings to support a new porch roof. Obviously the time to make this decision is before nailing the deck flooring in place. If the roof is attached to the deck it needs to be able to support the weight. How to install deck girder cantilever or drop beams a girder cantilevered or drop beam is a structural member positioned below the joists to support the weight of the frame.

Porch decks require 25 additional psf for roof loads for a total of 80 psf. Other innovations include n 32 a 32 wide 3 deep roof deck panel and our new smooth series rivet attachment for our portfolio of cellular deck products. While metal deck can be produced in any material thickness between 16 and 22 special gauging will make the deck much more difficult to source. Have no fear though.

Keeping water out from between the segments of built up deck beams can substantially increase the life of the structure. The joists will rest on these two deck girders and the decking in turn will sit atop the joists. The bigger you make your deck the more you ask of the framing timbers that hold up the deck s structure and the joists and beams that support the. Attach the spacers at 16 inch intervals.

Deck girder flashing tip. Decks typically are designed to support 55 pounds per square feet or psf of weight. Porch decks also require larger footings than deck footings. Indeed even when the deck is to be adjacent to the house an alternative construction method is to use a second post and girder system rather than tying the deck directly to the house via a header board.

The deck roof of today isn t the drab concoction so many of us remember. The footings for porch decks must be larger than deck footings. Many porches use 22 diameter corner and intermediate. First to the west coast market our new smooth series rivet attachment offers a.

Cut pointed spacers from a sheet of 1 2 inch pressure treated plywood the points prevent rainwater from sitting on the plywood and soaking in. In our photo the deck beam and some deck joist top surfaces have been protected by additional flashing. Fasten the spacers points up to two beam lengths with 1 1 4 inch screws. If the deck doubles as a porch it needs to be able to support no more than 80 psf.