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Question DetailsAsked on 3/30/2014

Roof support over cantilever deck

Using roof support beams on a 2 x 10 24 inch cantilever.

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1 Answer


I don't see a question here, but to get a building permit in almost all areas, and to do it safely, you will need a stamped design from a Structural Engineer before you can legally go to a Carpenter or General Contractor to actually get it done.

If you are asking can you do that using existing rafters/joists, generally no - most roof designs are adequate for the design wind and snow loads, but not designed with any leeway to add on an overhang, especially on the joist/rafter tails which generally are loaded to capacity with design snow load. For what you want to do, usually one would run new joists from inside the attic, probably "twinned" with the existing joists for lateral stability, comin g from halfway across the house to tie down to an intermediate wall plate, then horizontally create the overhang or reinforce the roof rafters to carry the cantilever load. Another common way is a support beam under the cantilever, supported by angled support columns coming back to tied into the house at the floor joists/rim joist.

If you want to give more detail of exactly what type of roof (and slope) you have, and what you are trying to accomplish (because I can see what a 2' cantilever gains you), use the Answer This Question button right under your question to answer back on this thread.

Answered 6 years ago by LCD

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