Partition wall on slab

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  #1  
Old 06-14-06, 07:10 AM
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Partition wall on slab

I am redesigning my entry foyer and powder room. I would like to put the new walls right on the existing slab which was pour in the 1950s or earlier. Should I put any type of barrier between the plate and the slab?
 
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Old 06-14-06, 08:06 AM
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Use PT lumber for the sole plate.
 
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Old 06-14-06, 10:33 AM
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PT indoors???

PT indoors???
 
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Old 06-15-06, 05:22 AM
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Originally Posted by bad1129
Should I put any type of barrier between the plate and the slab?
You need to separate wood from concrete as the moisture in the concrete will rot any type of wood (even PT) over time.

Lay an 8" wide strip of 6 mil poly on the slab under your bottom plate and wrap it up the sides of the 2x.
 
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Old 06-15-06, 06:11 AM
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PT indoors???
Not recommended for CCA, but I don't know of any prohibition against using ACQ indoors in a framing application. According to a couple of industry web sites it is OK to install indoors. It is allowed in my area by the local building officials.

As I understand it, the danger with CCA was mostly associated with small particles (sawdust) generated during construction. Once installed CCA treated PT was pretty benign. There was some concern about CCA treated wood used for playgrounds because of the possibility of leaching and sawdust remaining in the area.

If your slab has so much moisture that it will rot a PT sole plate unless it has a moisture barrier installed, you've got more problems than deciding what type of lumber to use.

A quick way to check for moisture is to tape a small square of plastic on the slab. Check it after a day or so to see if there is any moisture underneath.
 
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