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Discussion Starter · #1 · (Edited)
Hi All,

About to replace the roof on a detached two-car garage, heated (only when I'm working on a cold day as needed), no ceiling. There is insulation in the rafters (kind of a mess in pic, I will clean that up), no ridge vent, soffit vents outside but nothing keeping air between the insulation and roof deck. Walls are insulated and wood-paneled.

There is also a powered vent fan (pictured, about halfway up the rafters, I've read it should be higher).

This is all previous-owner stuff.

Not sure what to do here. I read that a ridge vent -and- a powered vent fan together is not recommended, so should I just have the roofers remove it entirely?. Or is there some logic that in extreme heat the fan could still play a role? Also, if the new roof will have a ridge vent, I think I need to install soffit vent baffles (right word?) to keep some space between insulation and roof deck so the soffit vents can do their part.

Any and all advice appreciated.

Pics:
www.slt1.com/grgfull.jpg
www.slt1.com/grgfan.jpg



 

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Discussion Starter · #3 · (Edited)
Thanks for the reply. I do work on my motorcycle and cars there but not too often, and only the bike resides full time. But there are also summer/winter tires (seasonally), good bicycles, large compressor, etc. Definitely want to air to be moving efficiently avoid overheating.
 

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retired framer
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The fan is a different bag of rags. It is more for keeping it cool in the summer or for moving air if you were running an engine inside. Rather than a roof leak I would adapt it to go in the back gable gable.

If you are just heating on a day by day bases when you are working out there. A lower uninsulated ceiling might be just as good or better than a high insulated ceiling.

If you are heating with a ventless heater, running the fan for an hour at the end of the day would be a good idea.

If you are doing insulation you should have full venting from the soffit to the peak.
Foam insulation and paper faced insulation should both be sealed behind a wall surface,
 
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