A subfloor is a wooden structural substrate to which durable finished flooring is attached.
Standard floor thisckness off grade house.
To prepare the base cut the ground level to the proper depth to allow for the slab thickness.
If you install flooring below grade you re going to run into issues of uneven floors cracks and moisture.
Basement floor thickness can be a problem if the concrete is too thin.
There are many types sizes and configurations of plywood.
Joists in home construction are usually made with 2 by 10 or 2 by 12 lumber.
Standard concrete floor slab thickness in residential construction is 4 inches.
Though joists may be any size that you desire using typical floor joist and beam specifications ensures that you can find hardware to fit the joists and that the floor provides adequate support for furniture and other items in a room.
Five to six inches is recommended if the concrete will receive occasional heavy loads such as motor homes or garbage trucks.
For example if you happen to move into an old house where the basement floor was an afterthought they may have poured the concrete too thin.
Plywood is usually used as subfloor today.
Different plywoods use various materials and methods of manufacture depending on the application for which they re intended.