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