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Posted by DesignGuy on August 7, 2007, 4:08 pm
I'm getting ready to have a new roof installed (tear-off old and replace),
and had a question. Right now my roof does not have ridge vents, it does
however have several passive vents ("turtle" vents?), plus one atfic fan
with a thermostat. The soffets are vented also.
Should ridge vents be included in the new roof?
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Posted by Clark on August 7, 2007, 4:51 pm
DesignGuy wrote:
> I'm getting ready to have a new roof installed (tear-off old and
> replace), and had a question. Right now my roof does not have ridge
> vents, it does however have several passive vents ("turtle" vents?),
> plus one atfic fan with a thermostat. The soffets are vented also.
>
> Should ridge vents be included in the new roof?
The ridge vent should not be used with other roof mounted or gable end
vents. They can disrupt the air flow through the attic. A properly setup
ridge/soffit vent system does not need to have power roof vents to help move
hot air out of the attic. Whole house fans work great with a ridge/soffit
vent system. We do not consider them the same thing as the power roof
vents.
How do I figure how much ridge vent I need to use?
Take the square footage of house under roof X .48 divide this number by 20
(for V-600 products), by 17 (for V-400E or X-5) or by 13.5 (for V-300 or
Fold-A-Vent products) this will give the lineal feet of product needed to
meet a 1/150 vent ratio. If you are only going for a 1/300 (code minimum)
vent ratio divide the above result by two. REMEMBER there MUST be an equal
amount of soffit vent (in NFVA) to balance the ridge vent.
http://www.cor-a-vent.com/ventilation-faqs.cfm
Hope that helps
Clark
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Posted by Art on August 7, 2007, 5:02 pm
Have a nice nail over ridgevent installed. Loose the turbines and fan. The
fan will suck ac air out of your house by causing negative pressure in the
attic.
> I'm getting ready to have a new roof installed (tear-off old and replace),
> and had a question. Right now my roof does not have ridge vents, it does
> however have several passive vents ("turtle" vents?), plus one atfic fan
> with a thermostat. The soffets are vented also.
>
> Should ridge vents be included in the new roof?
>
>
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Posted by John Grabowski on August 7, 2007, 9:01 pm
> I'm getting ready to have a new roof installed (tear-off old and replace),
> and had a question. Right now my roof does not have ridge vents, it does
> however have several passive vents ("turtle" vents?), plus one atfic fan
> with a thermostat. The soffets are vented also.
>
> Should ridge vents be included in the new roof?
>
>
I go into a lot of attics. The ones that rely solely on ridge vents for air
flow are always the hottest. I think that they are good to have for a
minimal amount of air flow, but I would keep the other vents and attic fan
as well to help bring the temperature down. Also good and many soffit vents
are important.
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Posted by Bose Kirkland on August 7, 2007, 10:12 pm
"DesignGuy" wrote
> I'm getting ready to have a new roof installed (tear-off old and
> replace), and had a question. Right now my roof does not have ridge
> vents, it does however have several passive vents ("turtle" vents?), plus
> one atfic fan with a thermostat. The soffets are vented also.
>
> Should ridge vents be included in the new roof?
Just hire HomeDepot to do the work.
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