ventilation for a newly built garage

[hugh59]

Hello one and all. I just had a new 3 car garage built. It is 24 x 30 with a 12/12 pitch roof so that I have a complete second floor for storage.

Here it is from the ally:

Here it is from my yard:

What I did not appreciate was how hot it would get up in the "attic." There are two 9" vents in the top, but they are passive. There appears to be no way for air to enter the garage; the eaves and the gables are pretty well sealed. I asked the builder and he suggested putting a powered fan (about 1400 CFU) in the roof and leave the existing two roof vents alone. However, with no way for air to enter along the bottom of the roof, all this would do is **** air in through the existing vents and it would go right out the top.

I suppose we could seal up the existing passive roof vents, but I still need a way for air to get into the garage. Could I put a few intake vents along the lower part of the gables?

Thank you in advance for your suggestions.

Hugh

 

[Greatbear]

Easiest? Gable-end vent on either end, with a powered vent inside one of them, or a shutter-mounted fan. Since the incoming air will be far cooler than what's in the space, it will fall to the attic "floor" and the air being drawn out by the fan would be hottest. You want to have some manner of flow-through ventilation all times of the year, especially if you get snow in your area. While your roof pitch is high enough to not worry much about ice damming, you still need to keep moisture buildup in check.