It can do both.
Attic door open in winter.
This insulation resists the heat from the terrace to pass it directly to the living room.
You can check for air leaks with a.
Ridge vent must me installed per the manufactures instructions.
The garage ceiling has a door to the attic.
That tells me that you probably need more insulation in your attic to reduce the radiant heat through the ceilings which you experience when the access door is not open.
Shutting the vents in your attic during the winter isn t going to help you hang on to too much heat where you actually want it in the living areas of your home.
I think you should do the reverse one.
Set the garage door so it closes leaving about 1 foot gap at bottom also lets cats come and go as they wish.
If they seem dried out or damaged remove them.
Lacking these i did the following.
Keep them open bottom line.
This insulation is penetrated if you open u.
Opening your attic access panel will draw that air into the attic and help to push the hot air up there and out through the roof vents assuming you have proper attic ventilation.
Your attic acts as an insulation between the terrace and the living room.
Best ventilation is open soffit venting to a open vented ridge vent.
A very high level of attic floor insulation r 40 or more would delay the heat penetration through the insulation until the cooler evenings at which time night radiation takes over.
Attic vent fans pull the cool air from outside into the attic to chill the air during the summer months and aide in the cooling of the home.
Instead it will merely cause a build up of moisture and heat that can cause other more troubling conditions in your home come spring.
There are different ways to accomplish this.
Then prop open the garage s attic access ladder by about 12 inches or enough to let a sizable draft enter your attic.
During the hot months many people leave their garage doors open in the day or there is even a screen door type covering for a garage.
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Check for air leaks and wood stops.
Inspect the weatherstripping gaskets around the attic hatch opening.
Opening your automatic garage door will let cool air and a draft in.
Insulation at least r 38 or more is there for heating and.
As you know cold air settles and hot air rises.