I'm working on installing a sleeper floor over a concrete pad in my garage, which I've converted into a living space. I'm planning to put down a vapor barrier first, and then anchor the joists to the concrete with tap-cons. According to building code, sills and sleepers that are in direct contact with the ground need to be pressure treated, unless they're separated by a moisture barrier. While my joists will sit on top of the moisture barrier, the tap-cons will penetrate it. So, given this situation, should I opt for pressure treated wood?
5 Answers
I recently replaced some subflooring, and they used pressure treated wood for the rim but regular lumber for the joists. Guess what? A third of the joists rotted out from condensation. The rim was fine, though! So I'd suggest using treated wood just to avoid potential issues.
If moisture is a concern, go with pressure treated. It's more resistant to pests as well, so it gives you that peace of mind.
Just a heads up, not all vapor barriers are the same—some don't act as moisture barriers! If you're worried about moisture, definitely go with treated wood. It’s a safer bet, even if it isn’t directly exposed.
I would skip the pressure treated wood for living spaces. It’s not needed and you might deal with some chemical fumes.
Instead of using tap-cons, consider floating the floor. And like someone mentioned, if there’s any chance of moisture, pressure treated wood is your best friend. Plus, it’s tougher against critters!