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Hard@work 03-11-2012 01:39 PM

Concrete floors
 
Do you place the vapor barrier over crushed rock or under crushed rock?

stuart45 03-11-2012 02:10 PM

1 Attachment(s)
I would put over the top, over a bed of sand binding as well to protect it.
Attachment 47327

Canucker 03-11-2012 08:58 PM

http://www.buildingscience.com/docum...flooring-probs

Skip the layer of sand , no need for it.

stuart45 03-12-2012 03:56 AM

Depends where you are. Building regs here insist on sand binding over hardcore to stop any punctures of the slab.

Canucker 03-12-2012 07:34 AM

True, building regs. do tend to lag behind in some areas of code

stuart45 03-12-2012 08:12 AM

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.

Canucker 03-12-2012 10:18 PM

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.

stadry 03-14-2012 12:08 AM

ohfercrhssakes, quit arguing back & forth :laughing: 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 :no:

cleveman 03-14-2012 09:30 PM

Yeah, I put a vapor barrier right on top of the rock and pour the concrete on that.

jomama45 03-15-2012 08:52 AM

Quote:

Originally Posted by stuart45 (Post 875856)
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......:laughing:

Here, we pour directly over the VB, being cautious not to puncture it. Plywood strips to wheel on & concencious workers goes a long ways.

stuart45 03-15-2012 11:31 AM

Quote:

Originally Posted by jomama45 (Post 878092)
You're not supposed to be pouring concrete in your golf cleats Stu......:laughing:
.

Thanks Joe, I know where I've been going wrong now:laughing:


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