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In this podcast, Tom Harris discusses moisture control layers and misconceptions and unrealistic expectations around spray foam insulation. In the “Spray Foam Reality” series, Harris discusses a number of the repeated issues I see and hear about.
“There are two types of spray foam in use today: Open cell foam and closed cell foam. Open cell foam is very light-weight and each cell is connected. In closed cell, these windows are not broken and we can replace the air that’s inside the cells with a different gas—one that resists heat transfer. That’s what gives closed cell foams the high R-value.