You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
Floor attic weight.
Joist dimensions are only part of the equation.
To floor an attic you ll need to install a sub floor for support before laying your plywood floor.
You also need to ensure that the joist spacing is adequate.
Even easier you can also use a prefabricated attic floor kit designed specifically to raise the attic floor above the insulation.
Installing attic flooring for light storage only.
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.
Attic joists for live loads.
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.
However if you keep the storage weight to a minimum you may be able to build a storage platform above the insulation by attaching supporting beams to the sides of the trusses.