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.
To provide background the house has a hot unfinished attic with blown cellulose and fiberglass insulation beneath the floor and no insulation along.
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.
They need to be open in the summer.
It even rained and the sill got wet but not the floor.
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My parents house has two small windows in the attic that open.
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Would it be better to keep them closed to keep out rain or open to allow ventilation.
When the attic becomes part of the home to be heated and cooled open wall gable vents and roof vents are no longer feasible but the underside of the roof the sheathing and rafters can still.
Here s what s open or closed in la oc ie vc.