I am building a 8x8 deck with stairs coming from landing on north side to landing on n.w. corner then along the west side. inspector said if I can show that running the 6 2x8 joist full length 12 ft. overhanging 4ft will support 100lbs per sq. foot I would not need additional post to support the 4ft. x 4ft. landing. would like some type of data to show this to be plenty. thanks for your help. need to know asap

  • If I figure it right, are you planning on putting 1600 lbs on the overhang? – Jack Dec 24 '15 at 18:30
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    8 adults in a 4x8 area with railings on three sides isn't an unforeseeable circumstance. – Daniel Griscom Dec 24 '15 at 19:52
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    Doesn't your inspector want an engineer to show that it can support the load? Would he really accept whatever data you can dig up on the internet? – Johnny Dec 24 '15 at 20:11
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    That's an absurdly long cantilever by today's standards. Around here you can't cantilever more than about 18" even with 2x12s (1.5 x joist height). You'll need to use taller joists there or a redesign. One option might be to drop taller joists by notching the opposite ends, which are presumably supported by joist hangers, and lower the beam in that area. – isherwood Dec 24 '15 at 20:34

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