Insulation Calculator
Area to insulate
sq ft
Attic floor area, or wall area for a wall.
R-value wanted
The US Department of Energy suggests R-49 to R-60 for attics in most of the country.
R-value already there
Six inches of old fibreglass is roughly R-19.
R-value per inch of the material
Blown fibreglass 2.2–2.7, blown cellulose 3.2–3.8, closed-cell foam 6–7.
Coverage per bag at 1 inch
sq ft
From the bag: manufacturers print a coverage chart by depth.
Price per bag
usd
Bags to buy
60 bags
Show the work
Insulation Calculator
by Rule Calculator