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Old 02-03-2018, 07:53 PM   #1
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Attic conversion ventilation concerns


I have a small attic space above the garage that I want to use as a semi-finished guest room. This is not meant to be permanent, so I'm making it all removable and cheap, as it will only be used a few days per year. My concern is how to keep it cool in the summer, without making the rest of the attic even hotter by blocking the vents.

This garage attic space is separated from the house attic by a wall. There are gable vents on either end of the building, and also in this wall, shown here in red.

Here, the garage is shown in yellow, and I'm talking about the space above that. I divide the space in half at the ridge with a heavy curtain, so the "living" area will be about 100 sq ft, (250 cubic feet with the sloped ceiling).

The floor is plywood. I have added R-tech rigid foam insulation to the walls and ceiling. I put a portable room AC in there and run the exhaust duct to a vent, shown here in blue. To seal off that space and keep it cool, I could block the other three vents. But if that causes increased temperature in the rest of the attic, I will have to run the main home central AC more. That's the dilemma.
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Old 02-03-2018, 08:16 PM   #2
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Re: Attic conversion ventilation concerns


I'm sorry, but I sense too many code and safety issues to even try to sort this out. If you tried to pull a permit I believe they would say no so I can't do any better.

Bud
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Old 02-03-2018, 09:05 PM   #3
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Re: Attic conversion ventilation concerns


Quote:
Originally Posted by Bud9051 View Post
I'm sorry, but I sense too many code and safety issues to even try to sort this out. If you tried to pull a permit I believe they would say no so I can't do any better.

Bud


I'm certainly not pulling a permit, are you crazy? This is a tiny project - closer to redecoration than construction.
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Old 02-03-2018, 10:44 PM   #4
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Re: Attic conversion ventilation concerns


Look, I'm not trying to be the bad guy but here on the forum we see both sides of every home, and when there are serious safety issues we each must decide if we should be helping or not. Converting an attic above a garage has some serious concerns and your decision to not pull the several permits necessary says, you don't intend to deal with them.

I didn't see a ridge vent mentioned.

Bud
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Old 02-04-2018, 09:10 AM   #5
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Re: Attic conversion ventilation concerns


Install a thermostatically controlled attic exhaust fan thru the roof on the house side of the wall between the garage and the house attic.
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Old 02-04-2018, 07:08 PM   #6
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Re: Attic conversion ventilation concerns


Just a partial list of things that would be needed to do this legally do this.
With no location in your profile where all going to have to guess what your local codes call for.
Most often it's 5/8 fire code sheetrock on the ceiling in the Garage ceiling.
Arc fault breakers to the outlets.
Minimum sized floor joist.
Code requred ceiling height.
http://evstudio.com/how-low-can-you-...building-code/
Egress window size.
Code size on stairways.
http://evstudio.com/how-low-can-you-...building-code/
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Old 02-04-2018, 07:31 PM   #7
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Re: Attic conversion ventilation concerns


First, I'll need a ten foot pole. Nope, can't touch it still.




If you're going to do it. Do it right. It doesn't sound to me like you want to do it right.
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