In the finale of season 4, it was seen that Walt Longmire (Robert Taylor) was having intimate moments with his Dr. Donna Sue Monahan, played by Ally Walker. Suddenly there was a mysterious intruder who breaks into Longmire's home. It was a cliffhanger not only for the season, but for the whole series itself.
Cost Of Spray Foam Insulation. Spray foam is available in two different types: open-cell spray foam which is usually $0.44 to $0.65 per board foot and closed-cell spray foam which is about $0.70 to $1 per board foot. The average cost to have spray foam professionally installed is about $1,728.ince spray foam takes up less space than other types of insulation -- fiberglass or blown-in insulation, for example -- you can change its thickness to meet the requirements of the application space. The average thickness of spray foam is three inches, but it can be made deeper if needed.
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.