I am getting a Kynar coated galvalum metal roof, replacing an old ugly asphalt shingle roof. My furnace in the attic is a direct-vent condensing type. I wonder if the flue gasses would create a rust issue in this spot. The 2 in PVC pipe that carries the combustion gasses through the roof, terminates approx. 40 in above the roof surface and has a 90 deg. elbow on it. I noticed some spots below on my old shingle roof, wondering if years of small drips in that area could have slightly degraded the shingles. I don't want this to happen to my new metal roof, obviously.
Is corrosion in this spot a problem you have seen? If so, what can be done to mitigate this? Seems like the 90 deg. elbow on the end might make additional condensations drips more likely.
Is corrosion in this spot a problem you have seen? If so, what can be done to mitigate this? Seems like the 90 deg. elbow on the end might make additional condensations drips more likely.
source https://hvac-talk.com/vbb/showthread.php?2223371-metal-roof-and-corrosive-furnace-flue-gases&goto=newpost
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