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best ventilation

Posted by hanyparekh on July 18th, 2007 11:11 PM

I'm replacing 22 yrs old roof in colonial house in michigan. Contractor suggesting replacing your 4 vents with ridge vent on top and other contractor suggesting add 2 more vents and replace all 6 vents with 960 no.
I have hot rooms upstairs in summer and cold in winter. How do I know what ventilation is the best for my roof?
How do I know condensation problem?
I have roof area is around 2100 sq feet.

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