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Old 06-28-2008, 06:56 PM   #1
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Vapor barrier for a concrete pad


So here I go again about my little concrete pad.
Hopefully we'll pour next week and that will be the end of it.

So it's a 4'x10'x8" concrete pad for 3 PO Cluster boxes to be set on.
The ground is ready (8" of compact gravel) and the forms are in place but now I am reading about vapor barriers.
Do I need a vapor barrier at all for this?

Also, I cannot find 4" rebar chairs for the rebar mat. Would two 2" blocks placed on top of the other be ok for the purpose of elevating the rebar mat?

Thanks again.

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Old 06-28-2008, 07:51 PM   #2
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Vapor barrier for a concrete pad


You do not a vapor barrier for that type of slab.

Pieces of block or brick (concrete prefferd, clay is OK) would be fine to support the rebar.

Dick

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Old 06-28-2008, 09:44 PM   #3
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Vapor barrier for a concrete pad


Thank you.
A few additional questions,

(1) Approximately how big should those small pieces of concrete blocks be?

(2) How far apart should they be spaced? My understanding, if using rebar chairs is that each rebar intersection should have a chair underneath. Should the same be applied when using blocks?

(3) I found plastic rebar chairs in the local home depot but they are 3" high. I know that the rebar mat should be 4" above ground since it's an 8" slab but is there any allowance to this? Can I use the 3" rebar chairs to save ourselves the headache of breaking up concrete blocks?

If it matters, the rebar mat is specified to #4 at 14" OC.

So there will be four 9'6" rebars spanning the 10ft length of the pad and eight 43" rebars the other direction
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Old 06-29-2008, 06:00 AM   #4
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Vapor barrier for a concrete pad


(1) split 'em in 2

(2) you only need enuff to prevent sag out of spec - no particular amount/number.

(3) raise 'em up w/pieces of 2" conc block scrubbed into the base 1"

i will be so thrilled when this job's done !!!!!!!!!!!!!!!!!!!!!!!!!!!!
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Old 06-29-2008, 12:58 PM   #5
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Vapor barrier for a concrete pad


Quote:
Originally Posted by yesitsconcrete View Post
i will be so thrilled when this job's done !!!!!!!!!!!!!!!!!!!!!!!!!!!!


Me too. I'll post pics of the most overthought, littlest concrete pad ever poured.

I do have to apologize as I tend to overthink things to the nth degree.

My poor son...
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Old 06-29-2008, 11:10 PM   #6
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Vapor barrier for a concrete pad


Quote:
Originally Posted by grumpybear View Post


Me too. I'll post pics of the most overthought, littlest concrete pad ever poured.

I do have to apologize as I tend to overthink things to the nth degree.

My poor son...
hey do it right

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