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Old 02-19-2019, 02:46 PM   #1
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No vents in garage build. Will I experience issues?


Hi everyone, im currently building out my detached garage to be used as a work space. Im planning on putting up some drywall and doing an exposed joist ceiling like the picture example below. There arent any air vents in the garage and im wondering if I will encounter any problems down the road if I dont put any in. I live in southern ca so its very dry in the summer, it can rain pretty hard this time of year but usually not for prolonged periods of time.

Any insight on how I should proceed?

p.s. please dont judge my messy garage

I also plan on installing a mini split system that will do double duty of sucking out the humidity in the air as well as cool and heat.

Ceiling Reference:


Current state of garage:
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Old 02-19-2019, 03:00 PM   #2
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Re: No vents in garage build. Will I experience issues?


You should have soffit and ridge vent don't plan on a floor above, ceiling strong enough to have drywall would be enough work on it's own and you will want insulation too.


That is a poor picture but a guess would make it 20 feet x 20 feet?
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Old 02-19-2019, 03:12 PM   #3
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Re: No vents in garage build. Will I experience issues?


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Originally Posted by Nealtw View Post
You should have soffit and ridge vent don't plan on a floor above, ceiling strong enough to have drywall would be enough work on it's own and you will want insulation too.


That is a poor picture but a guess would make it 20 feet x 20 feet?
here is a larger image. But yea, 20x20. The exposed joist ceiling will mostly be for aesthetics and double as easy storage when its an attic. Ill look for some soffit and ridge vents again...

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Old 02-19-2019, 03:23 PM   #4
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Re: No vents in garage build. Will I experience issues?


Any kind of floor would require at least one engineered beam maybe two,
Exposed from below would change everything to do with insulating the upper part.
The storage you have up there now is way to much for the structure.
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Old 02-19-2019, 03:35 PM   #5
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Re: No vents in garage build. Will I experience issues?


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Any kind of floor would require at least one engineered beam maybe two,
Exposed from below would change everything to do with insulating the upper part.
The storage you have up there now is way to much for the structure.
So just had another look, definitely no soffit or ridge vent. The plan is to get 12 22' 2x4's and lay some planks along the top of them for storage/insulation. Would I not just insulate it the same way I would if I were just installing drywall? (laying R38 or something similar over the boards)

I figured I was over engineering it by not having drywall on the ceiling...
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Old 02-19-2019, 03:46 PM   #6
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Re: No vents in garage build. Will I experience issues?


20 foot 2x10s with floor will sag under it's own weight, been there done that.


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Old 02-19-2019, 03:48 PM   #7
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Re: No vents in garage build. Will I experience issues?


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There arent any air vents in the garage and im wondering if I will encounter any problems down the road if I dont put any in. I live in southern ca so its very dry in the summer, it can rain pretty hard this time of year but usually not for prolonged periods of time.
So I'll probably get flamed for saying this..... but don't be so quick to listen to the folks telling you to add vents.

It's all about location.. location.. location.

Every home I've ever owned had a copious amount of vents in them.. except for our current home.

It was built in 1978. I has one small roof vent and no soffit vents. We live in the mountains of Central Colorado.

The attic looks like it was built yesterday.

The kicker... very low humidity (we have cactus growing in our yard) and it doesn't get very hot here (no air conditioning).

Additionally, roof vents can be a big problem in areas prone to forest fires. If there is air flow through the attic, then that same air flow can pull airborne embers up into the attic.

And you can't ask the local building / zoning folks... they will simply quote you chapter and verse from the IBC (International Building Code) That code has the same rules for the hot humid everglades of Florida... as it does for the hot arid desert of Arizona.

Like I said.. folks will disagree with what I have written here. But I've got a 41 year old home, with one vent, and no signs of any issues.

The best indicator of what works well.. is what other older homes have in your area, and what condition their attics are in.
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Old 02-19-2019, 03:50 PM   #8
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Re: No vents in garage build. Will I experience issues?


I guess we should ask location.
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Old 02-19-2019, 04:04 PM   #9
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Re: No vents in garage build. Will I experience issues?


@HenryMac not really a flame, but do you really advise everyone to follow your example which probably represents less than .001% of the population. Anecdotal guidance can be far from the best when those examples only fit rare and specific environments.

Glad your home is doing well but codes and guidance are meant to help a wider population.

Bud
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Old 02-19-2019, 04:06 PM   #10
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Re: No vents in garage build. Will I experience issues?


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I guess we should ask location.
.....

Quote:
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I live in southern ca so its very dry in the summer, it can rain pretty hard this time of year but usually not for prolonged periods of time
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@HenryMac not really a flame, but do you really advise everyone to follow your example which probably represents less than .001% of the population. Anecdotal guidance can be far from the best when those examples only fit rare and specific environments.

Glad your home is doing well but codes and guidance are meant to help a wider population.

Bud
Nope, I don't advise "everybody", what would make you say that?

The OP in this thread lives in Southern California...
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Old 02-19-2019, 04:26 PM   #11
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Re: No vents in garage build. Will I experience issues?


If your advice doesn't rhyme with the local codes where the op lives then it is bad advice. Sorry to be a pain, but lacking research beyond a one of a kind example doesn't give that argument much weight. Even when there is evidence pointing one way or another it is the local authority that decides which path to follow.

Bud
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Old 02-19-2019, 04:37 PM   #12
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Re: No vents in garage build. Will I experience issues?


I can understand the fire hazard and maybe no vents in that really dry area but you must have a good seal between the house and attic.


The problem here besides the structural issues is that a mini split would not keep up with a full cavity of the garage if he insulates the rafters. So ceiling insulation is called for but that also calls for a sealed ceiling. With out sealing the ceiling the insulation is pointless and if it is installed and allows some air movement then venting becomes even more important.
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Old 02-19-2019, 04:40 PM   #13
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Re: No vents in garage build. Will I experience issues?


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Even when there is evidence pointing one way or another it is the local authority that decides which path to follow.

Bud
You are absolutely right.

Logic and proportion have fallen sloppy dead.
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Old 02-19-2019, 04:51 PM   #14
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Re: No vents in garage build. Will I experience issues?


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20 foot 2x10s with floor will sag under it's own weight, been there done that.


I should have mentioned there will also be some vertical 2x4's for support so that the long 2x4's dont sag. Truth be told, this is not going to have an inspection, like most DIY projects. But that doesnt mean it shouldnt be up to safety standards. This is going to be a space for me to work and have clients over, the storage space that would be added by putting planks along the top wouldnt hold much more than what is currently up there. Drywall is the least inspiring material, certainly gets the job done effectively but this needs to be an inviting room that people feel creative in. And in my opinion drywall isnt the answer.
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Old 02-19-2019, 05:15 PM   #15
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Re: No vents in garage build. Will I experience issues?


Understood, I would like to be able to give some ideas that would solve all the problems you could have but I don't think I can.
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