These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Attic insulation and flooring.
Plan to pull up the flooring and layer new.
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.
This type of attic flooring will provide storage space for overflow items and seasonal items but it won t pass muster as a living space floor.
Stop using your attic for storage.
Attic insulation between roof trusses.
To floor an attic you ll need to install a sub floor for support before laying your plywood floor.
You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
How to lay attic flooring on top of fiberglass insulation.
But if the floor is covered in plywood you can t stuff enough insulation beneath it to do the job sufficiently not even in warm climates.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
Even easier you can also use a prefabricated attic floor kit designed specifically to raise the attic floor above the insulation.
The solid base.
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Start with the attic floor.
Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.