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Home inspector once told me my basement has a slightly high moisture reading.

No mold, dampness or musty smell.

I am building an entertainment built-in out of lumber and MDF.

Should I use pressure treated lumber where the wood will sit in contact with the concrete floor/foundation? The rest will be standard 2x4 lumber.

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    It can't hurt. Will you be leaving the floor bare concrete?
    – fixer1234
    Feb 26, 2018 at 1:56
  • Yes, at least that was my initial intention
    – Marinaio
    Feb 26, 2018 at 14:41
  • I would absolutely not use any material susceptible to rot (such as plain ordinary construction lumber) Feb 27, 2018 at 23:37

3 Answers 3

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If you'are trying to save money you could use regular lumber with sill seal, then the wood will not come in contact with the concrete. https://preview.tinyurl.com/yc5zzslh The URL takes you to a preview first and then provides a new link.

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  • A strip of plastic sheeting would probably work also. You may want to caulk the holes of whatever (galvanized or stainless) fasteners used to attach to the slab. Feb 27, 2018 at 23:37
  • A little late for the OP, I'm sure, but here I go - your house (ANY structure) that has any potential for cracking foundation/leaking roof/bad exterior paint job/etc has a potential for water infiltration. In both of the houses (90yrs and 100yrs old) where I have demo'd walls in the basement I have found at least one sill plate that was rotted out. In one of them the sill plate (from a 1980s reno) was completely composted to dirt as a result of persistent water leaking.
    – rajan
    Jul 15, 2021 at 3:41
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Most building codes require PT wood that will be in contact with basement concrete floors. So the bottom plate of a 2x4 wall and code requires the use of fasteners (galvanized) approved for use with PT wood.

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Yes you should use naturally durable (Redwood, cedar), or preservative-treated wood (AWPA U1 and M4) for sills or sleepers on a concrete or masonry slab that is in direct contact with the earth if you want to do it by the book (IBC 2304.11.2.4) and its also a wise idea.

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