OK, this might be a dumb question but:
If my basement floor slab has radiant heat (embedded tubing) and it’s proven itself to be ‘dry’ over the course of a year’s time, then why would there be any reason to use PT lumber as a base plate for any interior partition walls in said basement? We’ve been using the PT because we don’t know any better, but we’ve been gluing it down with PL adhesive. I cannot imagine that a “normal” SPF plate will deteriorate significantly over time if the basement floor heats it up and dries it out. I’d like to use regular framing lumber for what we have left and keep any more of that ACQ crap out of my house.
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Because it is still stipulated by code in many places.
Spheramid Enterprises Architectural Woodworks
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How dry is dry? Tape down a square of clear plastic on the floor and see if any moisture is underneath after 24 hours. I suspect you could use cedar sills, or borate treated sills, or maybe even standard lumber with a layer of Vycor or similar under it. I'd put my money on the borate. See if you lumber yard has it.