Ridgevents Efficiency In Winter???

 
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Old 02-10-2011, 06:04 PM   #1
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Ridgevents Efficiency In Winter???


Do ridgevents pose a common problem in areas where weather includes snow. Do they allow airflow when covered by snow?
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Old 02-10-2011, 06:08 PM   #2
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Re: Ridgevents Efficiency In Winter???


No.

Ridge vents are very seldom covered with snow.

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Old 02-10-2011, 06:10 PM   #3
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Re: Ridgevents Efficiency In Winter???


What about if they are covered by a foot of snow? On a 4/12 slope?
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Old 02-10-2011, 06:28 PM   #4
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Re: Ridgevents Efficiency In Winter???


Ok i got it thx
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Old 02-10-2011, 06:31 PM   #5
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Re: Ridgevents Efficiency In Winter???


Your welcome!! By the way I love your products and so do my clients! I look forward to future business.
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Old 02-10-2011, 06:50 PM   #6
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Re: Ridgevents Efficiency In Winter???


Quote:
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Your welcome!! By the way I love your products and so do my clients! I look forward to future business.
Do you do roof restorations
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Old 02-10-2011, 09:22 PM   #7
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Re: Ridgevents Efficiency In Winter???


Good question. If there was 2 ft of snow on the roof, wouldn't the ridge vent be covered?
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Old 02-11-2011, 07:05 AM   #8
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Re: Ridgevents Efficiency In Winter???


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Ok i got it thx
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Your welcome!! By the way I love your products and so do my clients! I look forward to future business.
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Do you do roof restorations
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Old 02-11-2011, 07:10 AM   #9
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Re: Ridgevents Efficiency In Winter???


My thoughts also.
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Old 02-11-2011, 07:30 AM   #10
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Re: Ridgevents Efficiency In Winter???


Anyone have solid advice when to avoid using ridge vent and if covered by a foot of snow does it breath??? If sophits are open but ice is on roof, and ridge vent is covered does it function??

Last edited by H.roofing; 02-11-2011 at 07:39 AM.
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Old 02-11-2011, 07:40 AM   #11
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Re: Ridgevents Efficiency In Winter???


Does your mouth function when it's covered?

No, there has to be a way for all that hot air to escape.
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Old 02-11-2011, 07:53 AM   #12
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Re: Ridgevents Efficiency In Winter???


If not... Then why do they recommend ridge vents as best ventilation for roof. Especially when I live in winter climate where a foot of snow is normal. When is best and worst roof to ventilate using ridge vent.
Is it intended for high slope areas?

Last edited by H.roofing; 02-11-2011 at 07:55 AM.
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Old 02-11-2011, 08:26 AM   #13
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Re: Ridgevents Efficiency In Winter???


Without baffles, ridge vents are easily plugged by blowing snow. Heavy snow will also reduce their efficiency.
In snowy climates it's always a good idea to install gable vents along with a ridge vent if possible.

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Old 02-11-2011, 08:57 AM   #14
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Re: Ridgevents Efficiency In Winter???


Take both hands and scoop up a big pile of snow. Now firmly plant that pile of snow against your nose and mouth. Now gently exhale.

Is this simple example significantly different than a slow moving volume of air through a ridge vent?

A warm (relatively) attic space will melt snow directly through the sheathing. The same residual heat readily migrates to the highest elevation in the attic and begins the same process at the ridge.

There was a thread recently describing a 'tunnel' created by the exhausting ridge vent under a snow cap. That is a physical illustration of the process.

Any surface mounted vent, whether at the ridge or below the ridge, will be exposed to the possibility of a snow load.
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Old 02-11-2011, 09:05 AM   #15
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Re: Ridgevents Efficiency In Winter???


if for example, there is NO RIDGE VENT but there are soffits..can that actually make an attic colder if there is no convection current?
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Old 02-11-2011, 09:27 AM   #16
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Re: Ridgevents Efficiency In Winter???


I'm trying to post a couple pics of what I have done with ridge vents on a 4/12 roof with no ridge, hopefully I can do this as I do have trouble posting pics on this forum. I may have to do this twice to get it to work, so bear with me .
The first pic is of how I modify ridge vent to work on a roof without a ridge, the second is of that roof in the winter as I was roofing the home accross the street. As you can see, there is nearly a foot of snow on the roof.
http://www.contractortalk.com/member...7-100-0630.jpg

hhttp://www.contractortalk.com/members/roofsafe-25728/albums/roofing-pics/9088-100-1509.jpg

Last edited by Roofsafe; 02-11-2011 at 09:31 AM. Reason: trying to load pics
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Old 02-11-2011, 09:28 AM   #17
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Re: Ridgevents Efficiency In Winter???


Quote:
Take both hands and scoop up a big pile of snow. Now firmly plant that pile of snow against your nose and mouth. Now gently exhale.

Is this simple example significantly different than a slow moving volume of air through a ridge vent?
The air from your mouth would be about 98 degrees F.

So yes, significantly different.

The air from the attic through the ridge vent will make a "tunnel", a tunnel of ice. Like the inside of an igloo. Try getting air through ice.

In the meantime that residual heat is melting snow through the roof sheathing and causing ice dams.
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Old 02-11-2011, 10:58 AM   #18
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Re: Ridgevents Efficiency In Winter???


Dennis, without being argumentative, I suggest you read building science on this subject. it is a huge no no to have both gable and ridge vents.

Ridge vents with a foot of snow over them will work as the air that is entering the attic is moving up as hot air rises and the ridge vent will then be clear to work.

Secondly, ridge vents being at the apex of a roof will have wind to blow the snow away.

Most ridge vents will be clear in a matter of a few days.
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Old 02-11-2011, 11:50 AM   #19
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Re: Ridgevents Efficiency In Winter???


In general vents when they are working properly will continue to exhaust warm air from the attic space and melt away what ever snow is covering them. If this is not happening quickly it may be that there is not enough intake (soffit) venting to keep the system air moving properly.

The rule of tumb is equal amounts of intake and outflow minimally with slightly higher inflow than outflow preferable.

One other thing to be aware of is that the ridge vents on different horizontal ridges if not at the same height should be seperated in the attic by a barrier. Plastic sheeting, visquene is fine. Otherwise the higher ridge will use the next closest ridge as an intake.

Lomanco is a vent company with a very helpful website and technical staff that has been very helpful for me.
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Old 02-11-2011, 01:44 PM   #20
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Re: Ridgevents Efficiency In Winter???


Framer, just trying to help and don't mean to be argumentative either.

I've been through "building science " and have not yet found the discussion/paper that studies or addresses not using ridge and gable vents together.
Could you, or anyone, give me a link to follow?

As for the breath-ability of ridge vents covered in snow:




I think you can see the layer of ice that has formed on the underside of the snow pack.
Been covered a couple weeks and we haven't had a lot of snow this season.

Of course, one size don't fit all. Generally speaking.

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