However in some cases the joists are intentionally built strong enough for the homeowner to later build out the attic.
Flooring attic insulation.
Most houses attics are built without flooring and are not designed to carry the heavy load of finished space.
Attics are great for storage but flooring directly over the attic floor joists doesn t provide room for the recommended 12 to 16 of attic insulation needed to keep your house cool in the summer and warm in the winter.
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.
Most homes are insulated in the attic and any floors located above unfinished basements or crawl spaces.
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.
First you ll need to measure the area you want to floor so you can calculate how much wood you ll require.
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Start with the attic floor.
No matter how old your home is it s a good idea to see if there are ways to improve its insulation.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
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.
The solid base.
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.
To solve this problem construct a raised platform from 2 4 or 2 6 lumber placed on edge add insulation between the.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Attic flooring consists of materials as basic as sheets of plywood as well as more elaborate interlocking floor systems.
Plan to pull up the flooring and layer new.
You ll have to construct a wooden frame or sub floor with boards 16 inches apart to provide extra support for the floor.
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.
Even easier you can also use a prefabricated attic floor kit designed specifically to raise the attic floor above the insulation.