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It wouldn't be recommended. It would be better to cut away the plaster or drywall in the area of the tongue and groove install and put in horizontal framing members to which the tongue and groove can be nailed.
how to water proof tongue and groove
I would use 2 x 6 joists 16" on center and cover them with 3/4 tongue and groove plywood. You can then cover the plywood with wood flooring or carpet.
Thicker is better... 1 1/8" tongue and groove works well. There are many homes with 3/4" as well.
The woodworking form "tongue and groove" (also tongue-in-groove) connects separate strips of wood, such as flooring, by having a milled extruding projection or ridge (tongue) on one side, that perfectly matches and fits into a milled concave recessed slot (groove) along the side of the adjacent board.
It would usually be 1 1/8" plywood or 2 x 6 tongue and groove boards which would be 1 1/2".
The most common varieties of softwood plywood come in three, five or seven plies with a metric dimension of 1.2 m × 2.4 m or the slightly larger imperial dimension of 4 feet × 8 feet. Plies vary in thickness from 1/10" through 1/6" depending on the panel thickness. Roofing can use the thinner 5/8-inch plywood. Subfloors are at least 3/4-inch depending on the distance between floor joists. Plywood for flooring applications is often tongue and grooved. The mating edge will have a "groove" notched into it to fit with the adjacent "tongue" that protrudes from the next board. This keeps the boards from slipping past each other providing a solid feeling floor when the joints do not lie over joists. Tongue & groove flooring plywood is typically 1" in thickness. Sources-- http://en.wikipedia.org/wiki/Plywood
no! no!
A tongue and groove specialist.
wood work
yes you can, as long as its treated timber. tongue-in-groove can be used on floors, ceilings, walls or fences. anywhere really.
If the face of your tongue and groove is smooth then you don't need drywall. I have one whole room covered in T&G cedar and it looks great.