WebJul 6, 2024 · Even at 3" half pound open cell foam is as air-tight as half-inch wallboard or 2" of closed cell, and it seals as tightly to wood framing as closed cell. In my area half pound open cell foam costs about 30 cents per board foot, closed cell runs a buck. That's 30% the cost per unit volume. Just about any spray foam or higher density fiber is ... WebAs with most building science questions, there is a short answer and a long answer. The short answer is that closed-cell spray foam needs to be at least 1 or 1.5 inch thick to act as an air barrier, while open-cell spray foam needs to be between 3.0 and 5.5 inches thick to act as an air barrier. Building Science.
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WebFoam Factory, Inc. is your source for a wide range of cost-effective closed-cell polyethylene foam products! From sheets in a variety of formulations to tubes and cylinders in a multitude of sizes, we have the materials for your next project in automotive, packaging, hobby, and more. ... Polyethylene Foam Sheets - 1.2LB Green. When you need a ... WebApr 5, 2024 · The average cost of spray foam insulation is $1,300 to $4,000 installed. Closed-cell spray foam costs $1.30 to $2.90 per board foot and open-cell spray foam costs $0.60 to $1.30 per board foot. Spray foam … WebJan 22, 2013 · If you have a 2 x 6 wall in the south, it doesnt make sense not to use open cell foam where the caviity can be completely filled for around $2.00/sf while achieving a 5.5 x 3.7R's per inch = R20 insulation before even considering the Rvalue of the entire wall system. 2" of closed cell foam costs about $2.00/sf plus the additional cost of the batt. did jonathan edwards believe in god