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Old 09-13-2009, 07:26 PM   #1
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question on footers and foundations


If you are digging the footer for a 18 by 20' slab ,13-14 inch wide footer ,how far apart should the rebar be on the 12inch cradles/supports?..is it ok to go with what i have(12 inch wide supports )vs the smaller cradles -7 or 8?
there will be a 12 by 12 inch/ footer with 4-5 inch high slab.

I also wanted to know if the correct order i plan to lay is ideal before pouring
concrete-on packed dirt:3inches gravel--then 4ply sheeting,then the concrete..(some have said sheeting --then gravel)..
Any info is appreciated.

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Old 09-13-2009, 09:30 PM   #2
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question on footers and foundations


The main thing you need to be concerned with is keeping the rebar at least 2" away from all the edges of the footer.

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Old 09-13-2009, 09:51 PM   #3
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question on footers and foundations


What Willie said about the rebar & the plastic goes directly under the concrete, over the gravel. Just use some caution not to destroy the poly when pouring. This is generally why 6 mil poly is used under concrete.
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Old 09-13-2009, 10:38 PM   #4
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question on footers and foundations


I hate to ask this because I think I know the answer, but what did the design call for?
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Old 09-14-2009, 12:31 AM   #5
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question on footers and foundations


Gravel, not sand?
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Old 09-14-2009, 01:09 AM   #6
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question on footers and foundations


Quote:
Originally Posted by Aggie67 View Post
I hate to ask this because I think I know the answer, but what did the design call for?
Me too. You need to check code in your area if you don't have a design. You can check it in the code book, but you'd be better served by checking with the local inspector.
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Old 09-14-2009, 01:11 AM   #7
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Originally Posted by vsheetz View Post
Gravel, not sand?
I can't say its that way everywhere, but around here you do not put sand under a slab. Gravel is the standard. In the thousands of slabs I've inspected in my career I've never seen sand under one of them.
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Old 09-14-2009, 10:39 AM   #8
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question on footers and foundations


I spoke with inspector and yes it is gravel-1-3 inches then plastic(for my area).and the rebar is to be about 3 inches in from wall of footer,paired.
Will a bit of gravel, atop plastic also ,aid in anything?
Is it best to pack down the dirt first before packing gravel?
I also have a pretty sandy area and plan to remove it and place clay soil over it also for a more solid foundation.
Any info is appreciated
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Old 09-17-2009, 08:36 PM   #9
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question on footers and foundations


I also was wanting to know how deep into the footer to run the conduit for the electric to the detatched garage.I will be linking it to the patio junction box and not using those lights any longer after completing it,kind of like swithing the lights to another location(its about 10 ft away). Do you have to use a new panel box ? What are requirements?

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