Seal Gable Vents After Ridge Vent Installed?

 
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Old 09-09-2007, 08:09 PM   #21
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Re: Seal Gable Vents After Ridge Vent Installed?


reveivl, my thoughts exactly.
http://roofersreview.com/htmlpage2( my page on the subject )

Ed,
I would prefer not to put too much emphasis on anecdotal evidence posted on forums or otherwise. You never know the exact circumstances. Was the vent installed or designed properly? Was the story related by a friend of a friend? etc. I can understand rare circumstances, say when fine dry snow for example, blows through a vent under heavy winds. But i don't think it's the norm.
As for no ventilation, I think it's possible. Depends on a lot of variables though.

Still readin.
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Old 09-09-2007, 10:25 PM   #22
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Re: Seal Gable Vents After Ridge Vent Installed?


actually the canadian topic I read from the ministry study is more to your line of thinking Dennis--they feel that sealing the attic from the home heating area is more important-a friend gave it to me ,I`ll see if I can get the link to e-mail you a copy
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Old 01-16-2008, 04:47 PM   #23
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Re: Seal Gable Vents After Ridge Vent Installed?


Dennis,

I found theat Hinrichs, 1962 document you were looking for.

http://www.osti.gov/bridge/servlets/...e/10186298.PDF

Ed
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Old 01-17-2008, 07:51 PM   #24
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Re: Seal Gable Vents After Ridge Vent Installed?


Ed, thanks. But I've already got that one.

The one I was looking for was the original Hinrichs study. I found it after a bit of searching.
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Old 01-17-2008, 10:42 PM   #25
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Re: Seal Gable Vents After Ridge Vent Installed?


I posted that link before I thoroughly read it, but it was too late.

Can you share the original 1962 Hinrichs with me, either in a post or via e-mail?

Thanks,

Ed
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Old 01-18-2008, 08:12 PM   #26
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Re: Seal Gable Vents After Ridge Vent Installed?


Ed, I scanned it and have it as a pdf, but the file is too large to upload here.

Send me your email and I will pass it along.
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Old 01-18-2008, 09:50 PM   #27
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Re: Seal Gable Vents After Ridge Vent Installed?


Thanks Dennis.

Message sent to you.

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Old 04-23-2012, 07:45 PM   #28
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Re: Seal Gable Vents After Ridge Vent Installed?


Heres the ticket... there is a scientific formula for calculating the proper attic ventillation. In most states, local codes are now requiring that you have a 300 to 1 ratio for your attic venting. Check with your local building code to see if this applies to you. Most manufacturers of roofing products will void their warranties if this is not met. Here is the formula Sq. Footage of roof i.e (using a round number)

1000 square feet of roof....... 1000/300=3.33333. then take that number and multiply it by 144 putting it in square inches. 3.33333x144=479.99999. now divide that by 2. this will give you the exhaust amount and the intake amount. in this case would be, 239.999 (just round up) to 240 for exhaust and 240 for intake.
Ridge vent typically equals 11 sq in. per foot
soffit vents =24 sq in.
box vents=50 sq in.


so for this case you would just divide your final number for the top by 11 and the bottom by 24.

240/11=22 ft of ridge vent
240/24=10 soffit vents.
Hope this was helpful. no need to ask for docs as this was a harvard study.

Josh (roofing specialist)
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Old 04-23-2012, 07:52 PM   #29
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Re: Seal Gable Vents After Ridge Vent Installed?


Harvard study?

Well knucklehead has been studying this for years and his conclusion is , the more the better. Vent the heck out of it.
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Old 05-13-2012, 11:13 PM   #30
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Re: Seal Gable Vents After Ridge Vent Installed?


The more the merrier. Temperature equalization between the attic and the outside air temperature is what counts. Having ventilation intake/exhaust at various locations around the house enables ventilation to occur no matter which way the wind is blowing. I would keep gable vents in place and functional. Ridge/soffit ventilation is superior to gable venting only because it fully ventilates (draws) from the lowest point to the highest. A lot of roofers really have no understanding of the real dynamics involved. Hope this helps and info doesn't get to you too late to do you any good.
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Old 05-13-2012, 11:18 PM   #31
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by knucklehead View Post
Harvard study?

Well knucklehead has been studying this for years and his conclusion is , the more the better. Vent the heck out of it.

Good call knucklehead, I agree 100%. Push or pull, equalization (temperature) is what you are ultimately after with ventilation in the first place.
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Old 05-15-2012, 08:19 PM   #32
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Re: Seal Gable Vents After Ridge Vent Installed?


what compelled someone to write on a 4 year old thread?
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Old 05-15-2012, 09:25 PM   #33
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by bluebird5 View Post
what compelled someone to write on a 4 year old thread?
Often, it's as simple as just failing to notice the dates on the posts. But in the larger picture, why does it matter as long as it's good input? Forums are good not only for immediate consultation; they can be invaluable as a reference.
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Old 05-15-2012, 10:21 PM   #34
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by jskjtm View Post
A lot of roofers really have no understanding of the real dynamics involved. .
how is this a sensible saying?? you got REAL roofers(who know the "dynamics") and wanna be's and part time guys that might not know..but to sit here and say roofers in general is crap..
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Old 05-18-2012, 02:39 PM   #35
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by bluebird5 View Post
what compelled someone to write on a 4 year old thread?

Ahh, isn't this a 4 y/o thread that you're writing on?
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Old 05-18-2012, 05:49 PM   #36
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by bluebird5
what compelled someone to write on a 4 year old thread?
I've heard stories that Tin has commented on threads he originally started in the 30s...
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Old 05-18-2012, 06:16 PM   #37
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by BamBamm5144 View Post
I've heard stories that Tin has commented on threads he originally started in the 30s...
Sometimes they need a little update...
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Old 05-22-2012, 09:40 AM   #38
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Re: Seal Gable Vents After Ridge Vent Installed?


Quote:
Originally Posted by jskjtm View Post
The more the merrier. Temperature equalization between the attic and the outside air temperature is what counts. Having ventilation intake/exhaust at various locations around the house enables ventilation to occur no matter which way the wind is blowing. I would keep gable vents in place and functional. Ridge/soffit ventilation is superior to gable venting only because it fully ventilates (draws) from the lowest point to the highest. A lot of roofers really have no understanding of the real dynamics involved. Hope this helps and info doesn't get to you too late to do you any good.
Nice thought however erroneous it is. I think I've seen several of your roofs, the ones that had a power vent, some turbines and some ridge vent. The more the merrier.
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Old 05-23-2012, 09:56 AM   #39
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Re: Seal Gable Vents After Ridge Vent Installed?


There's more to adequate ventilation than just cuttin the ridge and pokin some holes in the soffet, the roofer can do all that and do it right. Some "roofers" could care less about proper ventilation, regaurdless of when a roof is put on there is one step that goes on inside the home that regulates everything that happens inside the attic. That one thing is the "insulator", if you or someone in the know isn't there to stop them, they will always close off the space between the top plate and the roof deck, allowing "NO" air into the attic. That and not putting any baffles up is the number one issue in new homes not being properly ventilated.
The other side of the coin is the GC not wanting to spend money on any more than a couple gable vents or the roofer isn't educated in the importance of ventilation. Some roofers just put up a quick ridge vent and don't worry about the intake, the customer learns the hard way about intake, the roofer just keeps boppin along not knowing any better.
The code changes are made and licensed roofers in this area are notified of every change, the building contractors are responsible for the soffet vents and the roofer is responsible for the roof vents, box vents are easier so guess what gets put up most.
The rolled ridge is worthless and ridge vents with filters right along with them. My opinion, but I have seen a lot of evidence that my opinion is right on.
Gable vents, just like anything else don't work with any efficency if there is no air supply from the lower end of the roof, once the screen in the gable vents corrodes or fills with cobwebs it is no longer worth anything but asthetics.
I block them off because it just makes sense to make the soffet to ridge system work right.
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Old 05-24-2012, 09:07 AM   #40
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Re: Seal Gable Vents After Ridge Vent Installed?


Always love seeing the infamous Attic fan next to the ridge vent...where do you think that powered fan is pulling air from???

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