How far should plywood be mounted above the finished floor?

Mounting plywood above the finished floor is typically done to protect it from moisture and physical damage, especially in environments where water exposure or spills may occur, such as basements or laundry areas. The correct height for mounting plywood is usually around 4-6 inches above the finished floor. This height strikes a balance between providing adequate protection and accessibility for maintenance and inspections.

Installing plywood too high might not serve the intended purpose effectively and could lead to difficulties in identifying potential issues with the area beneath it. Conversely, mounting it too low could leave it vulnerable to moisture and other damaging factors, negating the protective intent. Thus, the range of 4-6 inches is optimal as it helps guard against common risks while allowing for practical interaction with the space.