1 The backslash divides the file name from the path to it, and one directory name from another directory name in a path. 2  You cannot use a backslash in the name for the actual file or directory because it is a reserved character that separates the names into components.
1 Open-cell spray foam costs $.40 to $.70 per board foot. 2  Closed-cell spray foam costs $.75 to $1 per board foot. 3  Expressed in terms of square feet, spray foam installation cost is $1.50 to $3.00 per square foot (for an average-sized home between 2,000 to 2,500 square feet, thatâs a total cost of $3,000 to $7,500.pray Foam Insulation Prices. While the function of spray foam insulationâto keep buildings warm during cold weather and cool during warm weatherâis the same as traditional pink fiberglass insulation, thatâs where the similarities between the two materials end.
I read your quote and this is what WE spray foam insulation contractors have to deal with. Anyway, This is how I figure an estimate. First off Spray Foam costs allot! $2200 to $2800 per set of 55 Gal drums. Closed cell (2.0 @ 6.98R per inch set value) You need foam at 4 to gain an 27.92R or you could go with 3 and gain 20.94R. 3 was closer to your desired 21R so we will use it for our base.