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Ceiling joist span question
#7243609
08/03/18 01:39 AM
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Joined: Feb 2012
Posts: 2,860
Cow_doc.308
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OP
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We're building a 20x30 foot apartment inside the shop we're getting ready to build. Plan to use the space above the apartment as a storage area. Not a lot of interior walls so ceiling will pretty much be clear span.
Talking with my brother, he recommended engineered trusses for the span to better hold the weight. Contractor sent me a quote for the trusses and one for 2x12 joists. I'm not planning to store a ton of weight up there or anything but I do want to be able to use that space.
There's a cost difference, but I'd rather do it right the first time.
What says the THF braintrust?
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7243613
08/03/18 01:43 AM
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Joined: May 2015
Posts: 4,136
Dalee7892
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On a clear span of 20 ft I would go truss. Look up wood span tables. 2x12 - 12" oc for 20 ft span, truss ? Oc. by mfg.
Last edited by Dalee7892; 08/03/18 01:49 AM.
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7243626
08/03/18 01:59 AM
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Joined: Sep 2010
Posts: 35,854
txshntr
T-Rex Arms
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T-Rex Arms
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I would go with engineered trusses but No1- 2x12 are rated for 21 span at a 30lb/Sf live load.
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7243632
08/03/18 02:05 AM
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Joined: Dec 2006
Posts: 2,057
ChrisB
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Your lumber yard should have an engineer that can tell you your options. TGI's may be a good option.
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7243644
08/03/18 02:19 AM
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Joined: Apr 2009
Posts: 6,096
pdr55
THF Trophy Hunter
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Why can't you beam at mid point of the 30' and joist out either way?
If you`re running down my country, man, You`re walking on the fighting side of me. (Merle)
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Re: Ceiling joist span question
[Re: pdr55]
#7243670
08/03/18 02:39 AM
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Joined: Feb 2012
Posts: 2,860
Cow_doc.308
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Why can't you beam at mid point of the 30' and joist out either way? Excellent point. This is why I don't build things for a living. There's a wall at almost midpoint of the 30' width. Could make that load bearing and have 14ft span and a 16 ft span. Seems more doable with lumber instead of trusses.
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Re: Ceiling joist span question
[Re: txshntr]
#7243805
08/03/18 11:13 AM
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Joined: Jan 2011
Posts: 65,416
SnakeWrangler
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I would go with engineered trusses but No1- 2x12 are rated for 21’ span at a 30lb/Sf live load.
I believe in science and Iām an insufferable [censored] Actually, BBC is pretty damn good "You Cannot Simultaneously Be Politically Correct And Intellectually Honest!"
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7244262
08/03/18 06:33 PM
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Joined: Oct 2004
Posts: 39,481
redchevy
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In our camp house we have a 30x40 building finished inside a metal building. We put up a beam across the middle sandwiched 3 2x12's with staggered seams and 2 evenly spaced post supports underneath.
It's hell eatin em live
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Re: Ceiling joist span question
[Re: Cow_doc.308]
#7244332
08/03/18 08:07 PM
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Joined: Dec 2008
Posts: 22,630
Cast
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I built a 24x36 garage twenty years back. I have one 40 engineered beam for the ridge beam and a 22 beam for the garage door. 2x10 joists on 24 centers with 3/4 plywood for attic floor. Attic is loaded up heavy. One big room, no center support. Held up fine so far.
Cast I have a short attention spa
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