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-   -   attic venting - ridge vent with soffit inlet AND gable vent (http://www.houserepairtalk.com/f34/attic-venting-ridge-vent-soffit-inlet-gable-vent-17711/)

raycyrx 06-01-2014 01:04 PM

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?

oldognewtrick 06-01-2014 01:25 PM

Take some plastic and close off the gable vents. You will short cycle the air circulation.

And :welcome: to House Repair Talk!

Wuzzat? 06-01-2014 04:17 PM

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.

nealtw 06-01-2014 08:24 PM

Close the gable vents.

Wuzzat? 06-02-2014 12:00 PM

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. . .

nealtw 06-02-2014 04:22 PM

Quote:

Originally Posted by Wuzzat? (Post 105784)
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.

Wuzzat? 06-02-2014 05:17 PM

Quote:

Originally Posted by nealtw (Post 105802)
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.

nealtw 06-02-2014 05:25 PM

http://homeenergypros.lbl.gov/forum/topics/the-short-circuit-theory-keep-or-remove-those-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.

Wuzzat? 06-02-2014 05:56 PM

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-Facts-World-Disinformation/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.

???

nealtw 06-02-2014 06:42 PM

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/resources/troubleshooting.shtml


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