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Open or closed attic.
Here s what s open or closed in la oc ie vc.
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.
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.
They need to be open in the summer.
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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.
My parents house has two small windows in the attic that open.
Would it be better to keep them closed to keep out rain or open to allow ventilation.
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.