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Question DetailsAsked on 10/16/2015

Is GAF Cobra ridge vent or Snow Country ridge vent better in snowy areas.

Is the GAF Cobra ridge vent or the Snow Country ridge vent better for this NE area of the country. This is for a classic New Englander home with 2 separate attics. Also, has louvered window opening on one end.

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Voted Best Answer

Is this a trick question ? Obviously GAF found out the Cobra lets snow blow in (which it does, and also ices up in winter) so they built the Snow Country Vent to work in snow country - so yes, Snow Country. Minimizes glaciering in all snow country, and is much better at avoiding snow blow-in and blockage in blowing dry snow areas.

I have seen small snow drifts in attics under many types of vents; no more than a dusting and some drips with Snow Country so along with Air Vent Shingle Vent II is probably one of the better ones out there for snow country.

BTW - on the louvered window opening - you presumably mean a gable vent, which if you have eave vents all along the eaves (as you should) detracts from your attic ventilation and should be blocked off after you confirm you have adequate eave ventilation space installed and functional because it causes short-circuiting of the ventilation in the attic. By code, you should have at least 1 square foot of ventilation (both inlet and outlet) per 300 square feet of attic space, and 1 per 150 if the ridge is not vented. In reality, studies have shown that you need about 1 per 100 to 150 even with ridge venting to get decent ventilation and moisture removal, and that the inlet open area should be 50% greater than the ridge (or gable) vent area to prevent the ridge vent from creating a suction in the attic. And any soffits should provide at least 50% greater open area than the ridge vents too - more if screened (as they should be).

You can find more comments on attic venting and insulation in the Home > Roofing and Home > Insulation links in Browse Projects, at lower left.

Answered 4 years ago by LCD

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