Garage Venting

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Forum topic by Redoak49 posted 07-29-2014 09:46 PM 1249 views 0 times favorited 7 replies Add to Favorites Watch
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3283 posts in 2013 days

07-29-2014 09:46 PM

I have my shop in part of my garage. It is a 2-1/2 stall garage which is attached to the house at one end and is a gable end on the other. The ceiling is open with no insulation and no vents and there are no windows. The heat builds up in the garage in the summer and is very hot with a large amount of hot air trapped up in the rafters. I want to vent the garage but am struggling to decide what kind of venting. The eaves do have ventilation built into the under side of them.

1) I could mount roof vents on the garage just below the peak on the back side. These could either be solar powered or passive vents.

2) I could mount a vent on the gable end. Again this could be either powered or passive. If I do not need to, I would rather not use a powered one due to the costs.

Which do you think would work best?

7 replies so far

View toolie's profile


2134 posts in 2652 days

#1 posted 07-30-2014 02:40 AM

Which do you think would work best?

i saw a feature about this on ASK THIS OLD HOUSE. the gable and roof vents were actually negating each other. i’d go with a gable vent with a ridge vent.

-- there's a solution to every just have to be willing to find it.

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5137 posts in 1745 days

#2 posted 07-30-2014 02:51 AM

Passive vents if you don’t want them to be seen. You could use a wind powered cyclone for maximum heat extraction and low cost, some people don’t care for the way they look.

View Woodknack's profile


11774 posts in 2404 days

#3 posted 07-30-2014 04:32 AM

I added gable vents on my shed and it made a drastic difference.

-- Rick M,

View crank49's profile


4032 posts in 2995 days

#4 posted 07-30-2014 04:39 AM

Powered vent, near the ridge, 1000 CFM unit costs about $70, 1500 CFM costs about $90.
Powered gable end vent, 1000 CFM cost about $150.
Solar powered vent cost about $350 for 300CFM.

I’m not sure, but I don’t think the “Wind Turbine” style vents actually extract any more air than a passive vent of the same size. I have buildings with both types and that is just my opinion. Never actually measured them.

For cooling effect I prefer the powered type.
The solar powered type is way over priced for what they do; in my opinion.

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1878 posts in 2053 days

#5 posted 07-31-2014 04:51 AM

sounds like my situation when I decided to convert my 2 car attached garage into a shop. I am surprised you have no ventilation out the roof top for ice dams and excruciating heat buildup / mold. Cheapest solution would be passive vents, which you can make yourself. For long term, consider putting up at least R19 insulation batts in the rafters… makes a world of difference. Later on, can stick in a cooling appliance in summer and heating appliance in winter.
For short term… your goal should be to remove the heat by venting, in some fashion. Know a friend that has a spare ceiling fan?

-- The Carpenter Bee is derived from the Ancient Greek word wood-cutter

View Redoak49's profile


3283 posts in 2013 days

#6 posted 07-31-2014 12:28 PM

I have a ceiling fan in my garage and in the summer it may help some. At the start, it just brings down hot air from the rafters. The garage is not heated and has no insulation. But, this is pretty typical for this area. Heating a 2-1/2 stall garage is nice but the cost is very high especially with a winter like the last one. Since the garage is not heated, there is no issue with ice dams.

I am leaning to putting in a passive vent on the gable end. It would look better than the vents on top of the garage. If this is not adequate, I will move on to a powered on by just adding it on to the passive vent.

View WhyMe's profile


1025 posts in 1585 days

#7 posted 07-31-2014 01:15 PM

Which do you think would work best?

i saw a feature about this on ASK THIS OLD HOUSE. the gable and roof vents were actually negating each other. i d go with a gable vent with a ridge vent.

- toolie

You should not use gable and ridge vents together. You use ridge vents with soffit vents or gable vents with soffit vents. Gable vents used with a ridge vent negate the convection flow of air from the soffit vents.

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