Bottom plate on concrete sensibility???

Old 12-31-05, 02:40 PM
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Wink Bottom plate on concrete sensibility???

Remodeling my basement... the inspector wants all bottom wall plates in contact w/the slab to be pressure treated, as is the standard. He also mentioned that untreated wood can be used with some kind of metal shield under it (???).

I just tore out a 25+ year old partition with untreated wood on the slab and it was spotless. The part I find silly is this: the manuf. only warranties the pressure treated for 1 year against. mold, mildew bugs. So what happens to the stuff 366 days from now? Has anyone considered this?

I prefer to avoid treated wood because it warps like crazy and if I can go w/KD separated from the slab I will. Holiday for the inspector... does anyone know what metal shield he is referring to? Has anyone used foam sill plate gasket under a bottom plate?

Thanks guys!
Old 12-31-05, 03:52 PM
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bottom plate on concrete

The pressure treated wood as a bottom plate is standard. You may have been lucky to have pulled pristine untreated wood from an old application, but why take the chance. Don't worry about the warranty on the pt. Putting a flashing under spf wood is quite expensive, since pt lumber isn't that much more expensive than spf. And don't worry about it warping, you will have enough pressure on it that it will think twice about warping. Ask the lumber yard about a warranty on untreated wood in contact with moisture, even with a barrier. Zilch, nada, so I'll take the year.
Good luck with the project.
Old 01-01-06, 10:53 AM
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Do what your Codes tells you.

However, wood is wood and it is always possible for it to rot when exposed to concrete. Concrete carries moisture. The Code for my area states that we are required to place 6mil poly between any wood and concrete. This virtually guarrantees the wood for 100 years.

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