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Old 08-08-2010, 09:10 PM   #1
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Ventilating detached garage


Hello,

We have a detached, unheated garage in Chicago, and I'm wondering whether I should add ventilation. There is currently no ventilation, and the entire garage is a single air volume (no partitions, ceilings, etc.). In the summer, it probably hits 120-130 in there. During the winter, it's nice to open the garage when it's -10 F out, and still +20 or 30 in the garage thanks to the engine heat from the night before.

I'm leaning towards ventilating, since I imagine 130 F isn't a great environment for our gas can, solvents, and everything else like that.

On the other hand, I'm worried that adding soffit vents and a ridge vent would make my car think I was leaving it on the street in the winter.

Many thanks for any suggestions!

P.S. No one else in the neighborhood seems to have soffit vents.

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Last edited by pnschi; 08-08-2010 at 09:12 PM. Reason: More information
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Old 08-08-2010, 09:19 PM   #2
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Ventilating detached garage


It is good to have some ventilation in case any fumes escape. They will rise and safely get out. We can start our cars down to -20C or lower (-4F for my neighbors) in unheated garages where I am.

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Old 08-08-2010, 10:29 PM   #3
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Ventilating detached garage


Often. The insulators cut corners when it came to insulating the partition wall between the garage and house. So adding vents to the garage is often a bad idea.

Your garage probably has more air leaks in it then you think.
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Old 08-08-2010, 10:39 PM   #4
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Ventilating detached garage


I installed an operable skylight in my detached garage/workshop when I built it. The natural light is great year round, and in the summer I can crank it open and ventilate the hot air out.

If you do this, put some thought into where to place skylight. I put mine on the east side of the shop, so that I get direct morning sun, before it gets to warm, and it is protected from blowing wind and rain, which generally comes from the West around here.
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Old 08-08-2010, 10:42 PM   #5
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Ventilating detached garage


Quote:
Originally Posted by beenthere View Post
Often. The insulators cut corners when it came to insulating the partition wall between the garage and house. So adding vents to the garage is often a bad idea.

Your garage probably has more air leaks in it then you think.
Thanks very much to everyone who has responded so far.

Just to be clear - this garage is totally detached from the house - I have to walk 30 feet/9m across the back yard to get to it. So venting it won't affect the house at all.
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