Adding roof vent during re-roofing?

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Old 08-04-16, 12:28 PM
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Adding roof vent during re-roofing?

Soon I will be re-roofing my hose with tin (aluminum). My question is on whether to eliminate the small vents that are covered with snow all winter and install a second whirly vent.(fewer flashings to contend with) Any advise? I have another whirly on hand.Name:  20160802_211216[1].jpg
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Old 08-04-16, 01:04 PM
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If you are talking of the small vents toward the top of the roof, ditch them and let the roofer install a proper ridge vent system. Air will move more freely in the warmer months. They'll probably still get covered with snow, but it won't last long.
 
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Old 08-04-16, 02:00 PM
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I agree. Dont worry about the ridge being covered by snow... it happens. You will benefit from the continuous ventilation in summer months.

Just another thought... you may want some snow brakes / snow guards installed over doors so that no one gets nailed by an avalanche.
 
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Old 08-05-16, 05:04 AM
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Question. Is your switch to a metal roof an attempt to resolve ice dam issues? If so, the source of ice dams is air sealing and insulation between house and attic along with good ventilation.

I agree with Chandler and X that a ridge vent combined with full soffit venting is best. I've seen many snow storms that have covered the ridge vents but they open up very quickly. Gable vents also provide a good backup for the ridge vents.

Bud
 
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Old 08-05-16, 04:05 PM
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What wont last long,the snow? Roof is usually covered from Nov-April.
 
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Old 08-05-16, 04:09 PM
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Xsleeper,I was thinking of that too.
 
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Old 08-05-16, 04:15 PM
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Bud9051 I don't have issues with ice dam,roofing just needs replaced.I'm not sure if my soffits are vented or solid.Snow cover here lasts for months,up to 3 feet, but I suppose it wouldn't stick around on that slippery surface as it did on the shingles.
 
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Old 08-05-16, 04:35 PM
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Well, there is Canada snow and then there is CANADA snow, yours sounds a bit farther north than central Maine. However, we do get a lot of snow occasionally and just due to snow load we have to clear it off. But some form and some amount of ventilation is advisable.

The key to natural venting is the difference between the high and low elevations, along with the vent sizes. All high or all low is not the best. And with your deep snow even the roof or whirly vents could become an issue. Check to see what you have under the eaves for venting. It is one of the best places for vents as they are well protected. Then consider gable vents to replace existing roof vents. If your current whirly has not been a problem, keep it and add another if you choose. They are taller and perhaps less susceptible to snow depth.

Bud
 
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