The thicknesses are as follows.
Thickens of plywood onkitchen floor.
If your plywood subfloor is too thin it might not cope with the load and it might creak or squeak when you walk on it.
The most common thickness of plywood is 1 2 inch but plywood thickness can range from 1 8 inch to 3 4 inches.
7 16 15 32 and 1 2 inch thick panels require joists spaced 16 inches on center.
Pressure treatment protects the wood from moisture.
It can support the weight of a person and heavier equipment without fatiguing over time.
With pressure treated joists spaced 12 inches apart this floor can last for 20 years or more.
Two sheets of 3 4 inch exterior grade plywood is the minimum accepted thickness for natural stone installations and if the stone is particularly heavy you may need to use floor joists that are 12 inches on center rather than the traditional 16.
The 3 4 inch thick plywood is sturdy.