how far can a joist overhang after last Beam


Old 06-22-09, 12:11 PM
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how far can a joist overhang after last Beam

I am building a deck that will overhang a creek for approximately 20. The deck will be 10 wide by 20 long. The 10 section will attach directly to the cabin with 6 of dry land before the creek start. I would like to have the deck overhang the water by 4 leaving the last run on the joists having 4 to 5 feet of free float past the beam. What is the best way to accomplish this? Can I double up two by tens to get enough support?

Excuse the bad text drawing, but you can see that i will have one beam at 6' wit the joist secured to the cabing at one end and the other free floating.

_|____________ Beam
_|_____________ Cabin
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Old 06-22-09, 12:33 PM
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Welcome to the forums! Cantilevering more than 1/3 of the supported joist length would not work. Too much weight on the cantilever and the remainder will pull up and out. If you provide additional structural strength like angle supports back to the last verticals, you may can get by with the 4' cantilever.

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