Open Cell Foam Vs Closed Cell Foam In Attic
Chemical manufacturer s claim if a roof leaks water will migrate through the foam structure therefore not trapping the water.
Open cell foam vs closed cell foam in attic. Roofing applications typically use a 2 8 to 3 0 lb cu. They are broken and air fills all of the open space inside the material. It is either open cell foam where the tiny cells of the foam are not completely closed. Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.
Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more. The open cells are filled with air and this affects the way the foam feels and performs. Most open cell foam has a density of about 5 pounds per cubic foot. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.
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. With the open cell below right vs. Closed cell foam is much denser than open cell foam. Open cell foam is just that open cell.
Closed cell below left issue there are two major factors to understand and consider. Closed cell foam can also increase the racking strength of attic walls which. Closed cell foam has cells which are sealed off so air doesn t get inside the structure at all. Open cell foam has tiny cells which are not completely closed.
Open cell foams typically weigh in at 0 4 to 0 5 lb cu. Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. The higher the density the foam the heavier or stronger it becomes. The first is the nature of the foam.
To support traffic and loads better. A foams r value is its resistance to heat flow or in other words how well they insulate. Let s not confuse open cell vs closed cell foam.