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A radiant barrier installed in 2009 with the primary purpose of insulation may qualify for up to a $1,500 federal tax credit for 30 percent of the material costs (installation charges are not included). To apply you will need your purchase receipt and the Manufacturer's Certification Statement.
For example, a wall measuring 10 feet high by 50 feet high has square footage of 500. If the wall cavity is 3.5 inches thick, you need a total of 1,750 board feet of spray foam insulation. Open cell spray foam cost between $0.35 and $0.55 per board foot on average, in 2014.Closed cell ranged from $1.00 to $1.70 per board foot in open spaces and as high as $2.00 per board foot in a confined space.pen cell insulation cost about $1 to $1.20 per square foot; closed cell insulation rang in at $1.75 to $3 per square foot as of 2014. Fiberglass batts cost between $0.70 and $1 per square foot, while cellulose ranged from $1.17 to $1.50 per square foot as of 2014.