DIY Home Improvement, Remodeling & Repair Forum > DIY Home Improvement > Roofing and Siding > attic venting - ridge vent with soffit inlet AND gable vent




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Old 06-01-2014, 02:04 PM  
raycyrx
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Default attic venting - ridge vent with soffit inlet AND gable vent

I recently had my entire exterior redone. Started with the roof and had a ridge vent installed with the redo. New soffits were then done with 100% vented pieces (the nice hidden vents in the groove).

When the siders did their part, they were supposed to install DECORATIVE vents on each of my three gables, but instead put in functional vents.

My question is, will the ridge vent with soffit intake still do their job properly WITH the functional gable vents or should I cover up the gable vents from the inside?



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Old 06-01-2014, 02:25 PM  
oldognewtrick
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Take some plastic and close off the gable vents. You will short cycle the air circulation.

And to House Repair Talk!



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Old 06-01-2014, 05:17 PM  
Wuzzat?
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Or you may want to block off the gable vents all year, or part of the year, for other reasons. At least now you have the option.

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Old 06-01-2014, 09:24 PM  
nealtw
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Close the gable vents.

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Old 06-02-2014, 01:00 PM  
Wuzzat?
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This seemed to me controversial and usually that means everyone is right at least some of the time no matter what their position on this.

I couldn't find a building science pdf link on this and running experiments with thermometers and looking up Cooling Degree Days is burdensome.

Oh, well. . .

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Old 06-02-2014, 05:22 PM  
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Quote:
Originally Posted by Wuzzat? View Post
This seemed to me controversial and usually that means everyone is right at least some of the time no matter what their position on this.

I couldn't find a building science pdf link on this and running experiments with thermometers and looking up Cooling Degree Days is burdensome.

Oh, well. . .
You don't need code to figure it out. The idea is to cool the roof as much as posible, winter and summer. As warm air leaves at the ridge it suck air in the soffets causing air flow under the whole roof. Dewpending on the wind the gable vent will introduce air instead of using soffet air or soffet air will leave by the gable vent leaving the ridge hot. So no gable vent unless there is no other choice.
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Old 06-02-2014, 06:17 PM  
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Quote:
Originally Posted by nealtw View Post
You don't need code to figure it out. The idea is to cool the roof as much as posible, winter and summer. As warm air leaves at the ridge it suck air in the soffets causing air flow under the whole roof. Dewpending on the wind the gable vent will introduce air instead of using soffet air or soffet air will leave by the gable vent leaving the ridge hot. So no gable vent unless there is no other choice.
Why doesn't the gable air cool the ridge?
I'd think as long as the air is moving, outside air is cooling the entire attic volume by some route and the Stack Effect mostly assures all the air is moving upward.

All of this ASHRAE stuff is complex, it's worse than other types of engineering, although civil engineering does also depend somewhat on climate.
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Old 06-02-2014, 06:25 PM  
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http://homeenergypros.lbl.gov/forum/...se-gable-vents

This one agrees with you all the way to the end when they make one mention about wind. My question is who lives where there is no wind.
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Old 06-02-2014, 06:56 PM  
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I saw that one early on and then saw the NACHI people heatedly arguing, so that's when I decided it's controversial.

Usually, asking for specifics for each option, dollars saved or comfort gained or shingle lifetime extended, makes most people pick up their marbles and go home.

When all else fails and the issue is important, read
http://www.amazon.com/unSpun-Finding.../dp/1400065666

This book says 'extraordinary claims require extraordinary proof' but the claim of either side is not extraordinary.

I have gable vents, no soffits & no ridge, and for a long time I had an attic fan which finally failed, and then some people said the cost of elec. to run the fan is more than the savings.

???

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Old 06-02-2014, 07:42 PM  
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As with anything else,as long as someone is making nice looking gable vents, they will be adding to the confussion

http://www.airvent.com/professional/...shooting.shtml



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