Anyway, back to soffits… If there aren’t roof ventilation specialists per se, then I guess I’m going to end up getting a general carpenter to do soffit vents. And if so, I have these questions…
Q1: Is installing them usually straightforward, e.g. the 4x16 variety?
My attic footprint is 24’x32’ (ridge=32’). And it’s 8.5’ high from attic floor to peak. It’s an open (cold) attic, with exposed rafters, no insulation in the roof… only the floor is insulated. And the insulation stops just before it reaches the roof at the edges/eaves so that there is at least 2" of channel there for air flow.
I have 19 rafters about 22" on center, so 18 bays. I was told the correct number of 4x16 vents was 10.
Q2: Does that sound right? And would that be 10 total or 10 per side?
Q3: So apparently it’s OK to have one 4x16 vent per every 2-3 bays, true?
Q4: I’ve never seen how (my) soffits are constructed, but I’m wondering if they might be subdivided internally into several cells (for lack of a better word) meaning that it’s not one big long continuous cavity. If so would you have to know where those divisions are and plan your vent locations accordingly?
Q5: Should I expect to be involved in calculating the number of vents so that the soffit/ridge balance is right?
Q6: I’d probably be willing to pay a little more to err on the side of oversizing the soffit vents slightly. Would that be a bad idea? Being slightly out of balance, more intake than exhaust? That couldn’t worsen the air movement underneath the roof, could it?
THANKS, THANKS, THANKS AGAIN for all your advice! I’m always appreciative of forums like these when I have to come up to speed quickly on something.