How many square feet a 55 gallon drum of spray foam does depends on whether drum is one component of two-part system, foam type open or closed cell, thickness applied, and yield, with typical 55 gallon drum set meaning one A-side and one B-side drum for closed-cell spray foam. For closed-cell spray foam at 1 inch thick, one 55 gallon drum set, meaning 55 gallons of A and 55 gallons of B, yields about 4,000 to 5,000 board feet, where board foot is 1 square foot at 1 inch thick, so at 1 inch it covers 4,000 to 5,000 square feet, at 2 inches covers 2,000 to 2,500 square feet, at 3 inches covers about 1,300 to 1,600 square feet, similar to calculating coverage for organized storage area. For open-cell spray foam, which expands more, 55 gallon drum set yields more, about 12,000 to 15,000 board feet, so at 3.5 inches for wall cavity it covers about 3,400 to 4,200 square feet, at 5.5 inches for attic it covers about 2,100 to 2,700 square feet. So 55 gallon drum set of closed-cell does 4,000 to 5,000 square feet at 1 inch, and open-cell does 12,000 to 15,000 square feet at 1 inch, with actual coverage depending on installer, temperature, and substrate, requiring professional estimation for project.
1 votes
Marked as accepted