The decision regarding the thickness of plywood to use for the subfloor in the attic has a lot to do with how you intend to use the attic and it also.
Board for attic floor.
Osb attic decking has a convenient tongue and groove design for easy installation.
If the attic joists are not adequate one way to strengthen the floor for live loads is to sister the old joists.
What size plywood for an attic floor.
Use the tongue and groove feature to lock multiple boards together and improve the organization of your storage space.
Also if the attic insulation is thicker than your ceiling joists you can raise the height of the joists to above the insulation by attaching 2 3 s to their top edge before you attach the attic floor boards.
Plan to pull up the flooring and layer new.
Start with the attic floor.
First you ll need to measure the area you want to floor so you can calculate how much wood you ll require.
You don t want lots of different floor heights or walking in the attic will be difficult.
Walk to one end of the attic by carefully stepping only on the wooden ceiling joists.
Sistering is the process of adding a new joist next to each existing joist.
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Strengthening attic joists for live loads by sistering.
Enjoy a clean look and increase the usable square footage of your attic by multiples of 8 sq.
If you ever need to cover them with finished flooring you can always nail down another subflooring before installing tile or hardwood.
Place a 2 inch by 3 inch board directly on top of the joist nearest to the edge of the attic with its.
Stop using your attic for storage.
You can install inch plywood or oriented strand board osb in 4 foot by 8 foot panels over existing 16 inch oc joists.
Use old boards that are close to the same thickness in a given section of the attic however.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
Modifying an attic floor s joist system is a job for the pros.