subfloor - pressure treated subfloor?

so i’m running in to a difference of opinions by two of my contractors. my floor contractor…someone who many brownstoners use and comes highly recommended…prefers that the contractor uses PT subfloor to avoid any warping potential due to water/moisture. The my construction contractor, who is putting down the subfloor, believes and experienced that PT subfloor is not necessary as long as there is proper water proofing and moisture barrier application, which he intends to do. plus he’s highly concerned of the chemicals that are used in PT lumber, given this new space will be a living room space. any one here have experienced the pros/cons of this?

ditmaspark

in Flooring 10 years and 11 months ago

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ditmaspark | 10 years and 11 months ago

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not sure if this matters, but this is an extension to the house…so under the floor is not a basement….rather the ground. will be two layers of insulation below subfloor: fiber and rigid over the fiber.

daveinbedstuy | 10 years and 11 months ago

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Never heard or seen anyone use PT for a subfloor unless you’re maybe talking a sun porch with no dry concrete block foundation around it.