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Question DetailsAsked on 5/4/2015

What is the best kind of roof vent to install if you are not installing a continuous ridge vent?

There seem to be two basic choices for roof vents if you do not have a continuous ridge vent. There is the standard square mushroom which is open on all four sides and the slant back with louvers on three sides. Many roofers are installing the slant backs, but the design of the slant back seems like it could allow water infiltration. The collar and base are not constructed from a single piece of metal, rather the collar is a separate piece of aluminum that is seamed to the base. I am wondering if this seam might leak water during heavy rain or snow as the louvers on the three sides of the slant back are angled in such a way that water and snow would be directed inward towards the collar. It also seems like any snow that get inside the boxed in area of the slant back might collect there and not have any easy way out. I would appreciate any thoughts on which of vent is better. and whether the vents should be aluminum or galvanized.

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