To determine how much foam you’ll need, you need to know 2 things, the area to be insulated (square feet) and how thick you want your insulation (inches). This might come as a surprise to you, but honestly, this is all the spray foam it takes to get the biggest bang for your buck with the air seal and thermal resistance needed for certain areas of the home. How many inches of closed cell spray foam do I need?Ĭlosed cell spray foam should be 4- to 5- inches on the ceiling and 2- to 3-inches in the walls. Can you leave closed cell foam exposed?.
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