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Old 07-24-2012, 11:54 AM   #1
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Ridge vent with two different ridge heights?


We're going to have to re-roof the house we just bought. I want to vent the attic properly (because we want a whole house fan), and from what I've read, a continuous ridge vent is the way to go.

However, this is a single-story ranch with two different ridge heights -- the taller over the house, and the shorter over the attached 2-car garage. I understand that the "chimney effect" is critical for attic venting, so I'm inclined to not ridge-vent the shorter garage ridge for fear it will spoil the soffit-to-ridge airflow on the rest of the house.

Other data -- the roof is hip (well, there are tiny "Dutch" gables, so it's mostly hip), but the attic spaces are interconnected with each other. I understand it's hard to get enough venting on a hip roof, so that makes this decision even more critical.

Thoughts?

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Old 07-24-2012, 03:50 PM   #2
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Ridge vent with two different ridge heights?


My thoughts are with a whole house fan you will need all the venting you can get on your hip roof, those fans put out a lot of air and I may be wrong but I don't think the ridge vents alone will be enough. If your whole house fan is pressurizing your attic space too much some of the air could find its way back in the house. I also have a hip ranch style home and am thinking about more vents with maybe even a small dormer on the back fitted with an attic type vent also.

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Old 07-24-2012, 04:04 PM   #3
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Ridge vent with two different ridge heights?


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My thoughts are with a whole house fan you will need all the venting you can get on your hip roof, those fans put out a lot of air and I may be wrong but I don't think the ridge vents alone will be enough.
Agreed. Currently there are far too few soffit vents, so I will be adding enough vents that there is a bit more square footage in soffit vent as there is ridge venting. And of course I'll make sure that all of that will add up to equal or exceed the amount needed for the WHF.

Looking more closely at my roofline though, I think I changed my mind. I think the garage should be ridge vented, as there is a valley between the garage and the house. With no ridge vent, this would let a bubble of hot air stay trapped in the garage attic with nowhere to go... I guess that settles it then. Vent it.
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Old 07-24-2012, 08:04 PM   #4
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Ridge vent with two different ridge heights?


What type of ridge vent do you plan to use? The reason I asked is there are many who say to stay away from the Cobra Ridge Vent.
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Old 07-24-2012, 10:29 PM   #5
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Ridge vent with two different ridge heights?


Not sure what brand yet, but I know I want to avoid the squishy stuff. Rigid for me.
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Old 07-25-2012, 07:50 AM   #6
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Ridge vent with two different ridge heights?


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Originally Posted by jiju1943 View Post
What type of ridge vent do you plan to use? The reason I asked is there are many who say to stay away from the Cobra Ridge Vent.
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Originally Posted by tylernt View Post
Not sure what brand yet, but I know I want to avoid the squishy stuff. Rigid for me.
Big +1

While, when installed properly, it can work. I have seen enough instances of poorly installed versions that created big issues.

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