The format of house insulation you need depends on where you put it and if you need to control.
Batting material in old house attic.
Typically houses in warm weather states should have an r 38 insulation in the attic whereas houses in cold climates should have r 49.
Increase your r value by layering insulation.
The big disadvantage with spray foam is cost.
Cold areas require a higher r value like an r 49.
Because the simplest and cheapest way to insulate an attic is to add material to the floor.
There are other materials and systems that you can use to insulate your attic.
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.
In a cooling climate a good blanket of attic insulation helps keep the house cooler and reduces the load on air conditioning equipment.
Additionally purchase some loose fill insulation to insulate corners and angles where the batting won t fit.
The insulation materials used in older houses are not as effective in keeping heat in as the new ones.
The answer to making an old house inhabitable is insulation.
I d blow insulation on the attic floor after air sealing of course.
These insulation levels will keep heated air from migrating out in winter.
Stop using your attic for storage.
The insulation must meet doe standards.
Plan to pull up the flooring and layer new insulation on top of the old.
If you live in a warm climate you require a lower r value.
To insulate an attic get some batting made out of mineral wool fiberglass or recycled foam.
It s generally 3 to 4 times what you ll pay for blown cellulose or fiberglass.