A brief recap of my situation: I have to do a mid-winter emergency soffit-vent retrofit to try to stop the moisture/condensation/mold that has come after a new roof was put on, with only a Cobra ridge vent (nailable mesh kind).
The carpenter is coming any day now and I’m trying to spec a continuous soffit vent (aluminum) with maximum NFA.
Why maximum? Because (1) I don’t want to take any chances of underventilating my roof, (2) I may upgrade the ridge vent to get more NFA, and (3) I’m considering adding screening to the soffit vents to keep bugs/flies out.
(Note: I nixed using round mini-louvers, even the big 4" ones in every bay, partly because I don’t think I’d be able to get enough air flow)
Q1: Anyone have experience w/ screen being added on top of continous venting?
Q2: Someone from Airvent thought screens would lower NFA by 20% or more. Anyone ever heard any other estimates on this?
Q3: Do you think my chances of clogged venting is A LOT higher with screen than without?
And about aluminum vent manufacturers. I’ve looked at Airvent, Tamlyn, Lomanco. They’re all about 9 SQ.IN per foot or less. I was hoping for something higher, especially if I diminish it by 20-30% due to screens.
Q4: Anyone know of an aluminum product 2-3" wide with NFA of 10-11 SQ.IN per foot?
Q5: Most products seem to have two sets of louvers one pointing out & one pointing in. However some products all point the same way. Is either better than the other for maximizing air flow?
Thanks for your advice!