Garage Venting

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Old 05-01-18, 11:24 AM
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Garage Venting

I have a large heated/insulated triple attached garage on my house, the garage has an insulated vented attic as well. My problem is that the garage heats up in the summer and I am looking to add some type of ventilation only for the summer months, BUT not sacrifice any (or some) of the heat retention in the winter months. I don't really like the idea of adding a window for security reasons. Any ideas are welcomed.
 
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Old 05-01-18, 02:10 PM
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It sounds like the garage is heating up from a hot attic. Is that the problem ?
An exhaust fan in the attic with some type of lover into the garage would seem to be the answer.
 
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Old 05-01-18, 02:50 PM
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A couple of questions.
You say the garage has an insulated and vented attic, is that insulation all in the attic floor?
Describe the ventilation, soffit vents, ridge vents, gable vent, other?
Is the garage attic isolated from the house attic by a fire wall?

Bud
 
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Old 05-02-18, 09:03 AM
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Yes garage attic floor is insulated and so are the garage walls. the attic is vented with just 2 or 3 roof vents and vented soffit. I would assume it is a firewall, in the garage attic I can see the bottom of the walls for the second floor (obviously insulated/poly as well...).

If the attic is vented (even minimally), that could still heat up a garage in the sun?
 
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Old 05-02-18, 09:38 AM
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"If the attic is vented (even minimally), that could still heat up a garage in the sun?"
Correct, passive venting where warm air is pushed out by the incoming cooler air doesn't do a lot for cooling. Its primary purpose is to exhaust any moisture that finds its way up there. It helps but lowering the temp from 160 to 140 would be hard to appreciate. A powered gable or roof exhaust fan with good intake could do better. You just need to maintain the isolation between the garage space below and that attic.

Bud
 
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Old 05-02-18, 10:05 AM
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They are definitely separated. Ideally I would like some vent in the garage to let in fresh air, but have it never leak cold air into the garage during winter while I am heating it....
 
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Old 05-02-18, 10:17 AM
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Vents at the floor level and ceiling level on a shady side of the garage might help while not presenting a security issue. Adding a powered exhaust fan would accelerate the air exchange.

Trees with leaves provide a nice seasonal shading option, allowing the sun through in the winter.

Are the garage doors on the sunny side? They are often the least well insulated and might benefit from some mechanical shading.

Bud
 
 

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