Girdered Roof Deck

Recommended beam joist spans for deck framing.

Girdered roof deck.

As a result most decks have inadequate footings to support a new porch roof. If the roof is attached to the deck it needs to be able to support the weight. The roofing material is more traditional such as shingles. Attach the horizontal beam by using a nail gun.

For heavy roofs or in areas with substantial snowfall or winds call your local building department for code requirements. Decks typically are designed to support 55 pounds per square feet or psf of weight. I am building a 10 x12 deck not attached to a ledger board. As beautiful as they are functional the modern deck roofs are an extension of and not a deterrent from the luxurious deck.

The deck roof of today isn t the drab concoction so many of us remember. Porch decks require 25 additional psf for roof loads for a total of 80 psf. Total height of low level ground level deck. A girder cantilevered or drop beam is a structural member positioned below the joists to support the weight of the frame.

The footings for porch decks must be larger than deck footings. Where local building codes allow this practice you can bolt a patio overhead s posts directly to existing deck beams joists or other heavy structural members. Or you can lag screw through post bases and decking into the top of a deck joist or beam. These traditionally styled roofs are made of wood and feature large supportive beams.

Porch decks also require larger footings than deck footings. Height of deck against door threshold. These patio covers tend to look like an extension of the home s main structure. Maximum rafter spans for a patio roof in areas with mild climates patio roofs are generally designed for loads of 30 psf pounds per square foot.

My plan was to pour concrete footings then run doubled up 2x8 beams setting on the footings. You have to do it thoroughly so that the rafters sit flush on it. Typical decks are designed to support 55 psf lbs per square foot. 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.

Many porches use 22 diameter corner and intermediate. Have no fear though. Building on an existing deck. Sep 04 19 11 12 am.

If the deck doubles as a porch it needs to be able to support no more than 80 psf. 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 connections. After that to make it flush with the roof of the existing house cut the two outer rafters. Apr 28 20 11 17 am.