corrugated panels...round chimney

I have a patio that used to be roofed with corrugated fiberglass panels applied directly over the framing (no decking). Finally replacing them with corrugated metal panels. The guys doing the work aren't experts but they did fine with installation so far. But now it gets tricky. There is a fireplace/chimney in the corner of the patio that projects through the roof. Two sides are flat and the rest of it is curved. With the fiberglass the former owner just cut the roofing close to the brick and used mastic to seal the gap between the roofing material and the chimney. Once it started to fall apart water started getting thru the gap and eating at the brick. None of the posts I've read seem to have this exact situation. I can live with just gooping the gap...it's a patio not the house. But if anyone has a better idea I would love to hear it. Thanks to all the volunteers! BTW before I could say anything the installer had already cut the roofing to fit around the chimney, so no possibility of creating some kind of lip. Although how that could be done with corrugated I am not sure.
Todd Miller
Isaiah Industries, Inc.
9/11/2011
Any suggestions out there?
David Stermer
9/12/2011
Juanita, I believe that a roof curb around the pipe is the only way to to avoid leaks and standing water when you have a penetration through a corrugated roof panel. The curb will allow the water from upslope to exit the upslope panel and be diverted around the penetration. Regards, David Stermer

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