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Old 09-12-2009, 07:09 AM   #1
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Steel garage & foundation


I'm new here so I'm hoping you guys can help. I'm looking at getting a 55'x30' galvanized steel building and wanting to do all of the site-prep myself on a 4" concrete slab with a 20x20 3000psi slab for a lift. I just have a few questions.

1. Are footers necessary or are they per the city/county code?

2. I planned on setting 10 mil poly for vapor barrier and rebar down for the main slab. Does it matter how I set them (length wise or width wise to slab)?

3. What distance between lengths of rebar should I set them?

Thanks for the help!

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Last edited by merc123; 09-12-2009 at 07:13 AM.
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Old 09-12-2009, 09:29 AM   #2
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Footings are necessary per code of course. There's good reason behind that. Freeze/thaw will destroy a building's bearing structure since the frozen ground swells/heaves when it freezes and shrinks when it thaws...Unless there's a footing that bears below the frost depth.

A 12" footing is the shallowest footing code permits, and that's only in areas with very warm climates all year. Most areas are 36" or deeper. No idea where you live since you haven't filled out your user profile.

Rebar is normally placed in a grid pattern. For a slab I'd do 24" on center.

10mil poly is overkill. 6 mil is the norm.

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Old 09-14-2009, 10:13 PM   #3
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Thanks for the help. I'm actually in Georgia. I thought I filled that in What's the typical width of a footer and how do you do the rebar in it?
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Old 09-14-2009, 11:14 PM   #4
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Footing size and reinforcement totally depends on the soil type and the imposed loads. No such thing as typical...Gotta get a design professional involved.
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Old 09-15-2009, 12:43 AM   #5
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http://www.reedconstructiondata.com/...codes/georgia/ http://www.dca.state.ga.us/developme...ams/codes2.asp Looks like you are under the 2006 IRC with your own State Amendments.
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Old 09-15-2009, 12:49 AM   #6
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Does the steel building supplier provide any guidence?

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