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.