The minimum thickness you need for standard 16 inch on centers joists is 5 8 inches but 3 4 inch plywood makes a more stable floor and is a better choice.
Thickens of plywood onkitchen floor.
7 16 15 32 and 1 2 inch thick panels require joists spaced 16 inches on center.
The national wood flooring association recommends a minimum plywood panel thickness of 7 8 inch for joist spans of 19 2 to 24 inches and a minimum plywood panel thickness of 5 8 inch for joist spans of 16 inches or less.
Pressure treatment protects the wood from moisture.
With pressure treated joists spaced 12 inches apart this floor can last for 20 years or more.
It can support the weight of a person and heavier equipment without fatiguing over time.
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.
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.