Cost of 55 gallon drum of spray foam depends on whether buying one drum or set, as spray foam requires A-side and B-side, so need two drums for system, and price varies by open or closed cell and supplier, similar to buying bulk organizers. For closed-cell spray foam, 55 gallon drum set, meaning one A-side isocyanate drum and one B-side polyol drum, costs $2,500 to $3,800 per set, with each drum individually $1,200 to $1,900, providing about 4,000 to 5,000 board feet at 1 inch thick, so about $0.60 to $0.90 per board foot material. For open-cell spray foam, 55 gallon drum set costs $1,800 to $2,800, cheaper per set but lower density, yielding about 12,000 to 15,000 board feet at 1 inch, so about $0.15 to $0.23 per board foot. Small DIY 55 gallon not typical, DIY kits use smaller tanks. For contractor pricing, wholesale distributors like IDI or Spray Foam Systems offer drum sets at $2,500 to $3,500 closed-cell, $1,800 to $2,500 open-cell, with prices fluctuating with chemical costs. So 55 gallon drum of spray foam costs $1,200 to $1,900 per drum, but need set of two for $2,500 to $3,800 closed-cell, $1,800 to $2,800 open-cell, providing thousands of board feet coverage.
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