Hi all,

 I am the customer service guy for our energy improvement company.  Recently, a customer asked what difference the orientation of his ridge vent made in relation to the prevailing wind.  In other words, if the vent axis is north-south and the prevailing winds are east or west, how does this affect the performance of the ridge vent?

thanks,

Bob

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Hi Eric,

@Eric "without wind each night I got cold air come down the ridge vent".  You didn't give a lot of details like, climate zone, outside temp, standard attic, hip roof, or cathedral ceiling? 

With a well insulated cathedral ceiling, the nighttime radiant cooling can make that 1" vent channel colder than the surrounding air, thus the cold air flowing in/down the ridge vent.

As for determining the ratio between the soffit vent area and the ridge there are other considerations, but generally the 60%/40% (soffit/ridge) works fine and shifts the neutral pressure zone a bit lower to reduce the air leakage through the remaining ceiling leaks. What's your reasoning for going to 2 or 3 to one?

@Eric "In a valley I see just heat stack and more mold in attic."  If the attic ventilation is at or near the traditional guidelines and they are getting mold in the attic, I would be looking for other problems. 

Bud

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