The wood should be at least 5 8 inch thick to handle a heavy load.
Best attic subfloor.
Weight concerns if you do have an existing walk up attic with traditional floor framing the principle concern when converting the space into a living area will be weight.
The most common uses are as sheathing in walls flooring and roof decking.
An attic conversion is a great way to expand your home s living space but best to leave the work to a licensed contractor.
Plywood is familiar to most people it is a sheet material made from layers of wood oriented in opposite directions from layer to layer.
Since the boards are sold in 4 foot by 8 foot sheets you may need to cut them into 2 foot wide strips to get them into the attic space.
Plywood or chipboard is the least expensive option for storage flooring.
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 depends on the spacing of the ceiling joists.
Osb oriented strand board is a different form of sheet material.