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Replies: 21
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Paw Master [17198]
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Question for structural engineers
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Feb 28, 2023, 1:20 PM
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I am working on an uncovered residential deck that has a girder running through the center of the deck.
How long can a triple 2x12 girder span that has attached to it (with hangars) 2x8x10 joist 16” O.C. on BOTH sides of the girder.
All wood members are pressure treated #2 pine with 5/4x 6 decking boards on top.
Thanks
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Clemson Sports Icon [52733]
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Depends. Do you have 82.45 million piers under it supporting
Feb 28, 2023, 1:23 PM
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it?
Did you then tie it down with a 200 foot hand dug foundation anchor every 6 inches?
If not, ooooh boy is it ever in trouble of blowing up.
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TigerNet Immortal [176635]
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42***
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Feb 28, 2023, 1:36 PM
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TigerNet Champion [117932]
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LOL, yeah right. Are you insane?***
Feb 28, 2023, 1:57 PM
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Oculus Spirit [39765]
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Re: Question for structural engineers
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Feb 28, 2023, 1:44 PM
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Heh, wood. Hehe, member.
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Heisman Winner [87000]
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Re: Question for structural engineers
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Feb 28, 2023, 3:36 PM
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Tiger Titan [48437]
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Answer me 2 questions, then I'll answer:
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Feb 28, 2023, 2:13 PM
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1. Do you have the Red Robin app?
2. Pigs of hangars?
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Valley Legend [12513]
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at a code minimum deflection of L/360 the max span would be
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Feb 28, 2023, 2:29 PM
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7'-0. but i would design it for a max. deflection of L/480 in which case the max span would be 6'6"
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Paw Master [17198]
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Re: at a code minimum deflection of L/360 the max span would be
Feb 28, 2023, 7:51 PM
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Great. Thanks
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Oculus Spirit [43161]
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What is the total width of the deck?***
Feb 28, 2023, 2:35 PM
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Valley Legend [12513]
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i assumed the "2x8x10 joist" ment they joist were 10 feet
Feb 28, 2023, 2:38 PM
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long so at least 20 feet wide. but you know what happens when you assume. 
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Oculus Spirit [43161]
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well yeah, I guess I can't read. 11-10 by IRC but
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Feb 28, 2023, 2:53 PM
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I never max out decks. I always design them for 60 psf Live Load instead of 40 psf Live. Sometimes a lot of people end up on a deck and they fail a lot.
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Ultimate Clemson Legend [102931]
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Design it for a bunch of drunks dancing.***
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Feb 28, 2023, 3:10 PM
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Paw Master [17198]
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Paw Master [17198]
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Heisman Winner [87000]
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Tell me more about your Grindr. Also, do you trim the hedges
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Feb 28, 2023, 3:25 PM
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around your deck to make it look bigger?
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Heisman Winner [80514]
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There's no big deck energy coming from OP
Feb 28, 2023, 4:19 PM
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much less any dickheat
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Clemson Icon [24262]
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Too many unknowns
Feb 28, 2023, 3:31 PM
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How high off of the ground?
What wind zone?
Hot tub later?
Could keep going but the trial is still going.
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Ultimate Clemson Legend [102931]
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If it's just two feet off the ground it's OK if it fails?***
Feb 28, 2023, 7:56 PM
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Ultimate Clemson Legend [108532]
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Usually around 3. Occasionally, 4 on a good day.***
Feb 28, 2023, 4:01 PM
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Ultimate Clemson Legend [102931]
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When in doubt make it stout!
Feb 28, 2023, 7:55 PM
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Just add another pier and make sure the deck is lag bolted to the house. I've seen more than one fall due to trusting 16 coated nails. Mark Petroski, sociology professor (mid 1980s) had one fall over from the framers using nails to fasten it to the house.
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Paw Master [17198]
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Re: When in doubt make it stout!
Feb 28, 2023, 8:37 PM
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Here in Charleston Most engineers will spec 5/8” through bolts instead of lag bolts.
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