Garage venting help

[jhl1963]

Hi guys, renovating our garage - new lvl’s/collar ties to raise the ceiling for a lift, insulation and gypsum board, new electric etc. The architect specified removing the existing gable vent with no venting. Spray foam in the walls and battens in the ceiling. Plan is not to a/c or heat, but I would like to stabilize the temperature as much as possible and maximize the life of the roof. I hadn’t thought much about venting until I saw a topic on GJ last night. Curious as to everybody’s thoughts.

Thanks!



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[Kaizen]

There has been some discussion that use of sprayfoam that stops all air movement does not need any venting. Also that adding venting does not extend life of shingles. Think I read on a building science website. I’d default to architect specs with no vent.


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[The Cobbler]

since you're insulating the roof bay with batts, the gable vents are redundant for attic ventilation. (IMO)

edit. I misread your post.
I would follow the engineers spec, but ask if you should put roof vents in low & high to get some attic venting.

 

[jhl1963]

Thanks fellas! Appreciate the input


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[anythingyoucanimagine]

Where do you live?

 

[jhl1963]

Where do you live?

NY


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[unslow1]

I wish I would've thought to raise mine before the new doors, siding and roof.

 

[The Cobbler]

since you're insulating the roof bay with batts, the gable vents are redundant for attic ventilation. (IMO)

edit. I misread your post.
I would follow the engineers spec, but ask if you should put roof vents in low & high to get some attic venting.

it's seems odd, this thread doesn't show in my subscribed threads nor does it show that I've posted. oh well, one of those cyberspace things I guess.

 

[Falcon67]

When you spray foam the envelope, it becomes the "conditioned space". Whether you condition it or not. Any "venting" would be for air exchange - as when you seal up a house with spray foam you have to install something to facilitate air exchanges to keep it fresh.

>Also that adding venting does not extend life of shingles.
I call BS on that, and I know several roofers that would also call BS on it. I've see lake of venting turn 25 year 3 tab into 12 year easy, at least here in Texas. When the underside of your OSB deck gets to 160~180F, you are cooking things.