Just curious, is there a formula that will tell you how many sq/in of vent ratio to sq/ft of attic space?? A lady called me the other day and said her attic was damp. She says she has vents and an attic fan w/thermostat. She says she needs more vents. I think the ceiling is insulated but not the roof so I assume this is a cold space. Gonna have a look this Sat. and see what’s up.