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Old 06-01-2012, 05:12 PM   #1
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Ridge vent "AND" power fan?


First post. I tried searching, but found various topics and not a real straight forward answer to this. So I appologize if this has been asked over and over.

I am getting ready to redo the roof on my home. I currently have a ridge vent on the house and no vent at all over the garage. There is also a power fan on the roof about 12" away from the ridge vent. It doesn't work.

I am going to put a ridge vent in everywhere, but my question is should I replace the power fan while i'm at it?

I've heard the fan will pull air from the ridge vent and defeat the purpose...is this true?

All the soffit venting i have are those 2" strips with holes in them. Sorta like this But the are all over the entire house. Cedar house by the way.

Going with OC TRUDEF Duration if anyone is curious.

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Old 06-01-2012, 05:24 PM   #2
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Ridge vent "AND" power fan?


Remove the old power vent and patch the old hole. There's no need for it if you have a ridge vent.

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Old 06-01-2012, 05:32 PM   #3
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Ridge vent "AND" power fan?


This was my initial thought, but it gets real hot up there. I'm going to put a temp sensor up there within the week to determine how hot, but it seems unusually hot. Although I can feel air movement between the rafters. Not much, I can feel it.

Maybe the current roof vent is pulling more from the power fan hole?

Although my shingles have been up there since '85. And they probably would last another few years, but some are starting to curl and a few have been damaged by wind recently. But all in all for a 25+ year roof its in real good shape. Even the roof above the garage with no venting is surprisingly in pretty good shape. So I guess my venting has to be doing "something" right.

Last edited by kris77; 06-01-2012 at 05:34 PM.
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Old 06-01-2012, 05:48 PM   #4
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Ridge vent "AND" power fan?


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Originally Posted by kris77 View Post
Although I can feel air movement between the rafters.
Not much, I can feel it.
There is a relationship between the ridge vent opening area (few are adequate) vs the overall house area... and the soffit vent opening area (even fewer are adequate) vs the ridge vent area (at least 1:1) to achieve adequate air changes. Convection does the rest.
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Old 06-01-2012, 05:58 PM   #5
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Ridge vent "AND" power fan?


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Originally Posted by kris77 View Post
This was my initial thought, but it gets real hot up there. I'm going to put a temp sensor up there within the week to determine how hot, but it seems unusually hot. Although I can feel air movement between the rafters. Not much, I can feel it.

Maybe the current roof vent is pulling more from the power fan hole?

Although my shingles have been up there since '85. And they probably would last another few years, but some are starting to curl and a few have been damaged by wind recently. But all in all for a 25+ year roof its in real good shape. Even the roof above the garage with no venting is surprisingly in pretty good shape. So I guess my venting has to be doing "something" right.
I don't think temperature has a ton to do with it. It's more air flow and letting the warm, moist air from the house escape through the roof. All attics in the summer are going to be very hot. You don't need both the fan and the ridge vent.
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Old 06-01-2012, 07:17 PM   #6
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Ridge vent "AND" power fan?


What is the temp & humidity that you are getting up there? My attic gets about 105 at the highest, with our power vent running, and by six I have seen it drop down to 91. Without the power vent, it would get as high as 130.

As for your's, with the power vent being within 1 foot of the ridge, it will not work like it should to help cool the space off quicker. As long as there is proper convection current, it should stay around no more than 110 on a hot day, if the passive system is working as it was designed. I would be looking for insulation in the way of the soffits and if it is, get the baffles to keep it away, so there is proper air flow.

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