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Reply by Ted

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Posted on Will a finish garage woodworking shop stop rust?

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Ted

2581 posts in 1180 days


#1 posted 01-27-2013 01:42 AM

The roof ventilation you’re referring to is necessary to prevent ice dams from forming. It involves soffit vents, clear passage between the joists, and a ridge vent to let the air escape. The principal is that heat rising from the living space will melt snow, which runs down the roof and is then re-frozen when it reaches the unheated roof above the soffits. Ice builds up and creates a dam. Not only does the dam itself cause roof damage, but the continued melt-off will pool at the dam and get under the shingles, causing even more damage. You can learn a lot more about it at BuildingScience.com. Here’s the search results for “ice dam” – http://www.buildingscience.com/search?SearchableText=ice+dam

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