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 or closed attic.
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Would it be better to keep them closed to keep out rain or open to allow ventilation.
My home has a whole house fan installed in the upstairs hallway ceiling when its cool at night that thing can suck the heat out of the house in record time.
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After leaving the attic window open overnight it was amazing how cool it got in there.
To provide background the house has a hot unfinished attic with blown cellulose and fiberglass insulation beneath the floor and no insulation along.
Closed cell foam can also increase the racking strength of attic walls which.
Although air should circulate year round through the attic your house will probably be more comfortable if you cover the foundation vents in the winter.
It even rained and the sill got wet but not the floor.
Here s what s open or closed in la oc ie vc.