After leaving the attic window open overnight it was amazing how cool it got in there.
Open or closed attic.
Closed cell foam can also increase the racking strength of attic walls which.
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.
To provide background the house has a hot unfinished attic with blown cellulose and fiberglass insulation beneath the floor and no insulation along.
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.
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Here s what s open or closed in la oc ie vc.
My parents house has two small windows in the attic that open.
They need to be open in the summer.
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.
It even rained and the sill got wet but not the floor.