If your attic joists won t bear the weight necessary to finish out a living space but the engineer cleared them to support floor decking for.
Floor attic weight.
Attic joists that are made from 2x8s may be acceptable for building your attic floor but because every room is variable there are no absolutes.
You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
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.
You also need to ensure that the joist spacing is adequate.
What size plywood for an attic floor.
To floor an attic you ll need to install a sub floor for support before laying your plywood floor.
Attic joists for live loads.
First you ll need to measure the area you want to floor so you can calculate how much wood you ll require.
Joist dimensions are only part of the equation.