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Horizontal moisture Barrior for P-T foundation

Horizontal moisture Barrior for P-T foundation

Horizontal moisture Barrior for P-T foundation

(OP)
Project is residential tracked home development.

To help reduce center/edge lift and edge moisture penetration, I wanted to recommend a horizontal barrier extending away from the slab.

I envision a strong UV resistant geomembrane like one of the Permalon products placed 4 to 6 inches below the surface and wrapped down into the footing trench.

I'd like some product recommendations and installing and securing the product.  

Also, anybody know of a way to find the Thornthwaite moisture index for an area.  I've tried Dept. of Agriculture, but no help.  The post-tension institute manual is quite poor on this point.

Thanks allot for any comments.

RE: Horizontal moisture Barrior for P-T foundation

Get the Thornthwaite moisture index for the National Weather Service.

Moisture barriers don't work for houses - too many penetrations during construction: water, sewer, gas, phone, cable, sometimes electric. (My neighborhood has buried electrical lines.  No power poles - very nice.)  And let's not forget trees, decks, pools, etc. that are installed after the home is built.

Increase the slab's stiffness - that's the only answer that works reliably.



Please see FAQ731-376 for great suggestions on how to make the best use of Eng-Tips Fora.  See FAQ158-922 for recommendations regarding the question, "How Do You Evaluate Fill Settlement Beneath Structures?"

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