I’ve gotten some bids for this, and only one contractor has said that the newly installed wood knee wall might be too damp for the spray foam to stick well. Anyone else had this problem?
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are you talking about just the moisture in the wood treatment? then no i have never seen it be an issue.
It's a bit more complicated. You said "treated" wood which would be unusual for an interior wall. Most spray foams require clean, dry surfaces. Pt lumber can vary across the country. Here in the Northeast our PT lumber is very wet and it will shrink considerably. Spray foam is normally used for insulation and sealing air infiltration. If the studs shrink and any gaps open, you could be spending your money for nothing.
90% of a spray foam job is the installer. It takes a lot of attention to the small details and difficult to get to areas. Two chemicals are mixed as they come through the gun. If the mixture isn't correct, the temperature is wrong, the nozzle not clean or the gun position and movement isn't correct, you can get shrinkage of the foam. Sounds like you talked to a technician that is thinking. I would stay with that person and follow his recommendations. Too many guys out there that don't understand the big picture.