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Old 05-24-2011, 04:57 PM   #16
Join Date: Apr 2011
Location: Maryland
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Originally Posted by GBR in WA View Post
Your 2" vents have 1.5" NFVA and the 4' with 2.75" NFVA should have 9"NFVA per foot on each soffit to vent 1/150;

The round vents should be touching each other or continuous for minimum vent supply;

The powered exhaust is pulling conditioned air from the house or crawlspace/basement.
Makes sence.

Based on what I have now, I come out with 90.25" NFVA and need 112" NFVA. So if I were to upgrade 15 of the 2" (22.5 " NFVA) to the continous, i'd be converting about 19', which would give me 239" NFVA.

Current calculations: 51 (2") x 1.5" NFVA + 5 (4") x 2.75" NFVA = 90.25" NFVA

Addition of some continuous: 36 (2") x 1.5" NFVA + 5 (4") x 2.75" NFVA + 19' (continuous) x 9" NFVA = 239" NFVA

Sound right?



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Old 06-04-2011, 07:17 AM   #17
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I began replacing two 8' sections of the round 2" screen vents with the Air Vent continuous vent, which Lowe's sells. I got up on the ladder and found that the screens were mostly clogged. So this could be the cause of the shingle issue.

Next weekend i'll work on the shingles and flashing on the chimney, and take photos and report back what I find.
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Old 06-10-2011, 06:50 PM   #18
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Looks like sheathing or possible tar paper problems. From those pictures it looks like either a DIY or bad workmanship job.


Last edited by Roofster; 06-11-2011 at 07:23 PM.
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