Is This Proper Ventilation? - Roofing/Siding - DIY Home Improvement | DIYChatroom

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Old 08-15-2009, 06:13 PM   #1
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Is this proper ventilation?

I have gable roof with a 90’ foot ridge. I plan on using a Ridge vent (Cobra Snow Country) to help ventilate my attic. According to 1/300 rule (2700 sq. ft. of attic), I calculated that I need 648 Sq. inches of NFVA exhaust ventilation and 648 sq. inches of NFVA intake. The ridge vent I plan on using has specs of 16 sq. inches per lineal foot NFVA that comes out to (16x90ft) 1440 sq. inches of NFVA. Is this too much or can I balance this out with more under eave vents? I have the feeling that my 1960’s home doesn’t have the proper amount ventilation passing through the eaves. What should I do? Does anybody have a better recommendation for ridge vent other than Cobra? Are my NFVA calculations correct?


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Old 08-15-2009, 07:54 PM   #2
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Shingle Vent II from has 18 square inches per foot.

But, you really need to address the amount of Intake Ventilation to make any type of Exhaust Venting work properly.



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