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Old 04-03-2012, 09:30 PM   #1
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Ventilation Help for Garage


Let me get straight to the point for this. Going to put drywall and then insulation in the garage ceiling. It will leave a foot, give or take, space between the insulation and roof. I know heat will be in between and will cause a problem. The garage is a 25x15. The roof is flat. It's all rubber tar paper layer type of flat roof with a brick barrier around it. Can I put a ventilation turbine and call it a day? Do I need an intake vent to let the outside air floor and push heat out through the turbine vent? or a fan to help pull heat out into the turbine vent? or just suck it up and get a solar powered vent? Any help will be appreciated.

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Last edited by Confuzzled; 04-03-2012 at 09:51 PM.
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Old 04-04-2012, 08:30 AM   #2
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Ventilation Help for Garage


A turbine without any intake at worst would suck air from the garage, at best it would do nothing and squeak. Best setup would be intakes at the walls with gravity vents on the roof as the exhaust. If you plan on doing this all yourself I would just install the wall vents as it would be difficult for a DIYer to install a properly waterproof vent on the roof (especially since you don't know what type of roof it is)

What is the slope of this roof?

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Old 04-04-2012, 09:02 AM   #3
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Ventilation Help for Garage


With a flat roof it's not a matter of if it's going to leak, it's when is it going to leak.
I agree, without something like a EPDM roof and a properly sealed heat welded or glued on roof jack it's going to leak.
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Old 04-04-2012, 11:07 AM   #4
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Ventilation Help for Garage


Quote:
Originally Posted by shazapple View Post
A turbine without any intake at worst would suck air from the garage, at best it would do nothing and squeak. Best setup would be intakes at the walls with gravity vents on the roof as the exhaust. If you plan on doing this all yourself I would just install the wall vents as it would be difficult for a DIYer to install a properly waterproof vent on the roof (especially since you don't know what type of roof it is)

What is the slope of this roof?
I've actually fixed the drain pipe from leaking from someone's lack of sealing so I think I can handle sealing a vent from leaking. I'm a hard ass on doing things properly but I'm not here to prove a point but rather just here to get advice on how to vent the garage. The roof is sloped enough so water is lead to the drain pipe. I keep the drainage clear from leaves and twigs so I know no water will back up into the vent. I will also be installing a drip pan just in case that any water that manages to get in due to the vent will be directed to the old sink drainage pipe that was previously installed.

As for the intake vents there is not much room in the garage to install one. Could I possibly put a vent above the garage door and then have it directed up a foot or so to the open space to help get air out through the gravity vent? Wouldn't the turbine vent still help pull heat out? Or just use a powered vent to pull air out? Btw, this garage is not meant to live in but rather work in so I am not looking to make this garage 100% comfortable. Just want to keep condensation from happening.
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Old 04-04-2012, 02:14 PM   #5
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Ventilation Help for Garage


Whether it's a garage or not, it doesn't matter. Hot air rises, if there are only vents at the top where is it going to pull air from? Why can't you punch a hole in the wall directly into the attic space?

You will need to flash the vent which means you need new material to run up the side of the vent (or a curb) and tie into the roof. The height of flashing required depends where you live and your weather. I'm not sure if your roof is EPDM, modbit, 4-ply and the "DIY-ability" varies greatly depending on the membrane. Simply sealing it at the level of the existing roof is not an acceptable practice. A drain pan below is a silly idea and you'll find you will have a rotten deck.
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