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Old 03-11-2012, 01:39 PM   #1
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Do you place the vapor barrier over crushed rock or under crushed rock?

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Old 03-11-2012, 02:10 PM   #2
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I would put over the top, over a bed of sand binding as well to protect it.
Concrete floors-externalwalls-floorandslab.jpg

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Old 03-11-2012, 08:58 PM   #3
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http://www.buildingscience.com/docum...flooring-probs

Skip the layer of sand , no need for it.

Last edited by Canucker; 03-11-2012 at 09:05 PM. Reason: more info
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Old 03-12-2012, 03:56 AM   #4
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Depends where you are. Building regs here insist on sand binding over hardcore to stop any punctures of the slab.
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Old 03-12-2012, 07:34 AM   #5
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True, building regs. do tend to lag behind in some areas of code
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Old 03-12-2012, 08:12 AM   #6
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Looking on that link they were talking about sand on top of the vapour barrier, which doesn't make sense. However without sand underneath the DPM there have been problems with damp coming through where the hardcore has punctured the plastic. Depends on how damp your climate is.
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Old 03-12-2012, 10:18 PM   #7
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If I'm interpreting it correctly, the crushed rock is a drainage layer, followed by vapour barrier, then the concrete. The only problem that a hole gives it, is that you would have vapour diffusion the size of the hole through the concrete. Standing water under the slab would wick through it though, which is a completely different issue.
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Old 03-14-2012, 12:08 AM   #8
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ohfercrhssakes, quit arguing back & forth just use 15mil vb & be done w/it,,, we use no sand under OR over our vb nor have we ever,,, then again, we never place conc over only a crushed stone base
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Old 03-14-2012, 09:30 PM   #9
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Yeah, I put a vapor barrier right on top of the rock and pour the concrete on that.
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Old 03-15-2012, 08:52 AM   #10
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Quote:
Originally Posted by stuart45 View Post
Depends where you are. Building regs here insist on sand binding over hardcore to stop any punctures of the slab.
You're not supposed to be pouring concrete in your golf cleats Stu......

Here, we pour directly over the VB, being cautious not to puncture it. Plywood strips to wheel on & concencious workers goes a long ways.
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Old 03-15-2012, 11:31 AM   #11
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Quote:
Originally Posted by jomama45 View Post
You're not supposed to be pouring concrete in your golf cleats Stu......
.
Thanks Joe, I know where I've been going wrong now

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