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Question DetailsAsked on 3/2/2016

How do I keep the snow from coming in my roof vents? There is an inch wide gap at the apex of my roof.

When I had roof vents installed, the guy cut off an inch of so of the apex and installed the vent over that -- and that was it. I find that snow now comes in to the attic with every storm since it is very windy here and we are situated at a high elevation. Is there some sort of air permeable solution to keeping the snow out?

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Actually the slot in the sheathing should normally have been 1-1/2 to 3 inches wide for proper ventilation - I have never seen one calling for just a 1 inch slot. Varies by manufacturer, and of course also significantly if you have a ridge board (down the center of the ridge, so the slot is on both sides ofthe ridge board).


Anyway, sounds like you probably have one of the vents where you can see right through it - or a coarse mesh rollout type. For your conditions you need a snow baffled vent, not a mesh type, and one rated for snow - like GAF Cobra Snow Country Advanced or similar, with baffles and drain channels so the snow gets trapped before getting to the cutout and also so it has free drainage tothe outside as it melts, which generally means a good deal higher profile than a normal rollout mesh type. In particular, for high-wind areas with dry snow (very likely since you said high elevation), you need a type with wind deflector baffles at the lower edges, so the wind flowing up the roof hits the baffle and shoots up over the vent, which also creates a partial vacuum so it pulls the air out of the attic even better - like this (oprogression of three sketches) -


http://www.diyhomeenergyconservation....


Answered 4 years ago by LCD




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