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Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.
Closed cell vs open cell foam in attic. Closed cell foam can also increase the racking strength of attic walls which. If you need an air barrier as part of your installation closed cell is a better choice. But then the questioner mentioned that the spray foam contractor had intentionally left big holes to the outside by not sealing the gable vents. This makes the foam weaker or softer feeling than closed cell foam.
Id go with closed cell. Open cell foam is used in a wide range of applications such as for noise reduction in sound rooms home insulation metal buildings under roof deck for semi conditioned attics and more. Many builders in cold climates use closed cell spray foam instead because of its lower water vapor permeability which means it doesn t need the extra step of installing a vapor retarder. Closed cell is denser better insulating.
Closed cell foam is much denser than open cell foam. They are broken and air fills all of the open space inside the material. A lot of builders and homeowners are going with spray foam insulation because of the airtightness benefits. Open cell foams typically weigh in at 0 4 to 0 5 lb cu.
Most open cell foam has a density of about 5 pounds per cubic foot. An overview of closed cell spray foam insulation closed cell spray foam insulation is highly efficient. Open cell spray foam insulation needs to be at full thickness before it can act as an air barrier. Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.
Closed cell spray foam insulation acts as an air barrier at any thickness due to its solid properties. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. A foams r value is its resistance to heat flow or in other words how well they insulate. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.
It is either open cell foam where the tiny cells of the foam are not completely closed. Roofing applications typically use a 2 8 to 3 0 lb cu. Closed cell foam differs in that all of its tiny foam cells are closed and packed together. Open cell foam has an r value of about 3 5 to 3 7 per inch while closed cell foam has an r value of about 6 per inch.
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