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.
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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.
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.
Start with the attic floor.
You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
The solid base.
Stop using your attic for storage.
Attic flooring consists of materials as basic as sheets of plywood as well as more elaborate interlocking floor systems.
First you ll need to measure the area you want to floor so you can calculate how much wood you ll require.
Attic insulation between roof trusses.
Flooring all of your attic or large areas of your attic is a little different in the sense that you have to deal with more obstacles mainly your attic insulation wiring and pipes therefore we recommend raising your attic floor level with thick batons this allows for extra insulation if required.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
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.
How to lay attic flooring on top of fiberglass insulation.
Even easier you can also use a prefabricated attic floor kit designed specifically to raise the attic floor above the insulation.