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Colby 03-18-2009 02:06 AM

Concrete and Poly Moisture Barrier
Howdy I'm Colby and I'm studying Building Construction Technology at

Texas State Technical University. I'm working on a project for class.

Anyways the project is that we are fixing a rotten floor system in an

existing house. We have chosen to take out the previous lumber

components of the old floor because extensive moisture damage took

place. Our plan for fixing this is to pour concrete into the existing shell of

the foundation and basically make it into a solid slab foundation. Part of my

assignment is to estimate the cost and the materials needed to do this

work on this house. I'm doing fine but my teacher told me I needed to

factor into my costs "Poly" expenses. I believe this poly is like the Tyvek

house wrap but I wondering if I need something different for concrete. Am

I right in thinking the type of poly my teacher was thinking of is like the

Tyvek House Wrap? :icon_confused: I'm also unsure where to purchase this poly and

what type I will need. Any help would be greatly helpful. :)

Thank you



Ron6519 03-18-2009 05:55 AM

Poly is just plastic sheeting. You would use a 6 mil thick plastic. You should also factor in foamboard insulation while you're at it. Since you're pouring a new slab, it makes sense to put in 2" of polyisocyanurate foamboard under the concrete.
Masonary supply or a home improvement store should have one or the other.

Colby 03-18-2009 09:57 AM

Thanks a lot for your help Ron, :thumbsup: thats what I needed to know. Thanks again !!:thumbup: I'lk make sure to include that as well. :)

Flt_Simulation 03-25-2009 08:47 AM

This is a photo of a house I am building here in the Philippines (kitchen area) ... but basically it is nothing more than a concrete slab poured over the dirt ground underneath.

You can see that they laid a sheet of poly / plastic between the ground and what will be the poured slab above it.

Of course they also installed a matrix of rebar that will re-inforce the concrete when the cement is poured over the rebar.

16" tile will go over the cured cement slab to finish the job.

Gary in WA 03-27-2009 12:02 AM

Hi, Colby. Glad to hear you are studying buildings in school. Here is an interesting article you will enjoy:

Towards the bottom is perimeter insulation for thermal break discussion. Be safe, GBAR

Colby 03-31-2009 10:07 AM

Thank you
Thank you guys for replying to my post, and thanks for posting the photo and for the article, I look forward to reading that. :) Thanks again,



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