Spray Foam comes in two forms - open cell and closed cell. Open cell spray foam has a lower "R value" than closed cell spray foam, and requires 6" thickness to achieve vapor barrier. Closed cell spray foam requires only 3" to achieve vapor barrier.
Spray foam has the highest R-value of all the insulation material available on the market today at R-7 per inch.
At ECS LLC, we only use closed cell spray foam, as we have found that open cell only works well in commercial buildings.
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