Let s not confuse open cell vs closed cell foam.
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.
Id go with closed cell.
Closed cell is denser better insulating.
Seems like you wouldnt want to seal something susceptible to mold growth but maybe thats just me.
Closed cell foam has a higher r value than open cell foam usually about 6 0 per inch.
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.
Open cell foams typically weigh in at 0 4 to 0 5 lb cu.
Closed cell foam can also increase the racking strength of attic walls which.
It is either open cell foam where the tiny cells of the foam are not completely closed.
Closed cell foam has cells which are sealed off so air doesn t get inside the structure at all.
A foams r value is its resistance to heat flow or in other words how well they insulate.
With the open cell below right vs.
Closed cell foam for insulation applications range in density from 1 7 lb cu.
Open cell is more susceptible to mold and mildew but its expanding so it can hermetically seal an area.
The higher the density the foam the heavier or stronger it becomes.
To support traffic and loads better.
Open cell foam has tiny cells which are not completely closed.
Closed cell foam is much denser than open cell foam.
The first is the nature of the foam.
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.
Open cell foam is just that open cell.
Closed cell foam can be over three times that with a density of 1 75 pounds per cubic foot or more.