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Yes there is. Different in many places. Consult local regulations wherever you are.
That is the thickness of the studs, -the inside of the wall.
You use 1/2 inch for ceilings
Partly the extra thickness, and partly a chemical they put in the mixture.
1/2 inch is the standard.
Drywall labour costs depend largely on where you do them. Labour costs across north America differ locally.
dung, drywall
Usually 5/8" .
24 + 24 for the ceiling.
You use 5/8 fire proof drywall on both sides.
No drywall is not a good shock absorber. It's too rigid.
For interior walls you want to use 1/2 inch size drywall. You want to use the thicker drywall because its stronger and it's a lot harder to damage than the thinner drywall.