Open Cell Foam Vs Closed Cell Foam In Attic

The higher the density the foam the heavier or stronger it becomes.

Open cell foam vs closed cell foam in attic.

Id go with closed cell. With the open cell below right vs. Closed cell foam can also increase the racking strength of attic walls which. Most open cell foam has a density of about 5 pounds per cubic foot.

Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area. The first is the nature of the foam. Closed cell is denser better insulating. Roofing applications typically use a 2 8 to 3 0 lb cu.

Open cell foam has tiny cells which are not completely closed. To support traffic and loads better. Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me. The open cells are filled with air and this affects the way the foam feels and performs.

Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch. 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 is much denser than open cell foam.

A foams r value is its resistance to heat flow or in other words how well they insulate. Closed cell foam for insulation applications range in density from 1 7 lb cu. Chemical manufacturer s claim if a roof leaks water will migrate through the foam structure therefore not trapping the water. Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.

Closed cell foam has cells which are sealed off so air doesn t get inside the structure at all. 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. They are broken and air fills all of the open space inside the material.