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Old 10-13-2019, 05:06 PM   #1
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Help! Monolithic slab with footer...


So as short & simple as possible we're having a 24 x 30 ft garage built in our backyard but we're responsible for having the concrete foundation poured n whatnot. The 1st guy we hired completely screwed up our porches as well as blew us off for weeks after we had done the excavating for the slab almost causing the rain we got slammed with to destroy everything. Literally my husband n I were out in the middle of a lightning storm shoveling dirt as fast as humanly possible back into the footer before the walls of dirt washed into the footer. If that even makes sense anyways after we told that guy to piss off we decided to tackle it ourselves. We've gotten as far as re excavating but I'm stuck we can't figure out how to form I get the basic concept but can't figure out why they're calling for a footer that's a foot wide 30 inches deep! We were going to use those icp leave in place forms but they only go up to 8 inches wide wth?! And then there's the soil its sandy clay loam which apparently drains slower...so should we do that stuff with the layer of aggregate er whatever even though the plans don't specifically say anything about it? And then I stumbled across something that talks about form a drain and couldn't figure out if ur supposed to worry about sloping for water drainage after the concrete is set n garage up or is that something that's built into the structure of the garage & now I'm not even making sense to myself! *sigh* also we've already had snow I covered the area with a huge tarp but how soon if @ all do I need to be concerned about the ground freezing? I'll post a few pics n the plans shortly gotta go feed our fuzzies before they drive me up the wall
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Old 10-13-2019, 05:27 PM   #2
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Old 10-13-2019, 05:29 PM   #3
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Re: Help! Monolithic slab with footer...


Footing 30 inches deep, is likely to do with frost depth in your area. So where are you.

There are a dew different types of slabs and even the description changes from place to place,
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Old 10-13-2019, 05:36 PM   #4
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Current excavated site
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Old 10-13-2019, 05:48 PM   #5
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Re: Help! Monolithic slab with footer...


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Originally Posted by Tashana View Post
Plans
I can't read the plan you posted but by the picture it looks like what we call a pan slab.

To prep that all the soilis is removed and replaced with compacted gravel
A little deeper around under the footer so a drain pipe can be added there later.
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Old 10-13-2019, 06:30 PM   #6
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Re: Help! Monolithic slab with footer...


we've used icf's & always had conc fnds upon which to start setting them,,, imo this forum isn't where to learn 'HOW to's so critical for successful outcome.
depth is determined by anticipated frost line/local govt codes/etc
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Old 10-13-2019, 06:31 PM   #7
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Colorado Springs, CO
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Old 10-13-2019, 08:08 PM   #8
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Re: Help! Monolithic slab with footer...


You're plans show a stock cross section of a floating slab. Our building departments have sheets like these available for people to easily fill out for garage plans, so you don't have to hire an engineer for a simple detached garage. Did the building department write 30" depth in red? Whoever did that doesn't know what they are talking about. I don't see how you could pour a 30" deep thickened edge slab. Even here in frozen Minnesota, we build detached garages on floating slabs which are only 12" thick.(60" frost depth).


If they want garages built on frost footings, fine, but why hand out a drawing for a monolithic slab? That deep I think you want to pour a footing, then a block or poured or ICF stemwall, then pour the slab itself.



The problem is supporting a 30" tall concrete form from one side. That would be a lot of plywood, 2x4's, bracing.




You could maybe save this situation by pouring a footing and setting your ICF's on that. It's going to cost more and be a ton more work. Or go to the building department and see if you can verify if they really need a 30" deep footing on a detached garage. Because something tells me they have a plan reviewer who is new or incompetent or something. Hopefully, there is someone there that can explain it.
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Last edited by Marson; 10-13-2019 at 08:13 PM.
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Old 10-14-2019, 08:18 AM   #9
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Re: Help! Monolithic slab with footer...


If it's gonna take you some time to get this done, I'd spread tarps over the whole thing to minimize the effect of rain on the earth walls. Won't keep from getting water in the hole, but should minimize wall collapse.
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Old 10-16-2019, 02:51 AM   #10
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https://i.imgur.com/VxGLRiO.jpg

How I've always done monolithic pours
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Old 10-16-2019, 04:57 AM   #11
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Re: Help! Monolithic slab with footer...


Quote:
Originally Posted by Vancouvergrant View Post
https://i.imgur.com/VxGLRiO.jpg

How I've always done monolithic pours
that is not what he has.

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Old 10-19-2019, 08:31 PM   #12
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Yes the building department wrote the 30 inches
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Old 10-19-2019, 09:24 PM   #13
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Re: Help! Monolithic slab with footer...


Quote:
Originally Posted by Tashana View Post
Yes the building department wrote the 30 inches
Is that the only style of foundation you are allowed to do?
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