3/4" usually, but some homes have double layers of plywood or 3/4" ply and 1/2" of particle, manufactured homes sometimes have 1/2" particle board subfloors. The best way to check is to pull a floor vent off and use a mirror and look yourself.
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Galvanized steel sheets covered by this standard are intended to be used for general ordered on the basis of their length, thickness and depth and number.
It depends on the thickness and width of the footings and the thickness and height of the foundation walls.
1.9mm
1.9mm
i/8 of an inch