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.
Best attic subfloor.
Best seller attic dek universal attic dek 4 pack made for 16 in.
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.
Item 12182 model 231331.
23 32 cat ps1 09 tongue and groove douglas fir subfloor application as 4 x 8.
The best you can hope for is perhaps to lay some thin plywood platforms down over the bottom truss members and use them to store lightweight items.
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.
Learn how to master the steps for framing a new wall including measuring layout and nailing.
Plywood or chipboard is the least expensive option for storage flooring.
On center joist spacing model 351804 60 44 box 60 44 box free delivery.
The wood should be at least 5 8 inch thick to handle a heavy load.