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TOPIC: I Have An Existing Metal Roof and Have A Question

Metal Chimney Pipe Flashing for Ribbed Metal Roof

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Hi Folks... I'm installing a woodstove in my new room addition.

The cathedral ceiling kit offered by DuraVent comes with a metal chimney-pipe flashing, basically just a flat sheet with a metal cone in the center. I see no way to install this on my ribbed metal roof.

I don't want to lay it atop the roofing and just slobber caulking all over it, as so many want to tell me to do; that's not flashing, that's a patch! And it won't last to awfully long, either.

It's been suggested that I cut a 1/8" slot in the metal roofing, and slide the up-slope end of the flashing into the slot and underneath the metal roofing. Well, yeah, I can see that, but what about the ribs? Installed this way, it's just going to sit in the air, atop the ribs. Am I supposed to shape the flashing to conform to the ribs? Am I supposed to flatten the ribs underneath the flashing?

Still others have suggested a high-temp silicone boot type of flashing... not sure that would work in this application, and I'm not a big fan of boots anyway. And again, it's not flashing; it's a patch, set on top of the roofing and sealed with caulking. I just don't see this as a permanent solution, or even a good one.

DuraVent makes mention of a "Flashing for Metal Roof" on their site, but it's just offered as an option when buying the kit... no explanation of how it differs from a regular flat one, no pictures, nothing. I really don't want to just buy it and charge in blindly, hoping it will be just what's needed.

Anyone have any experience with a similar problem? Thanks!

Karl Harris
Karl Harris

3/10/2019
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Many people use Dektite flashings which do involved sealants and exposed fasteners but they have a good track record. Slitting the panel is a possibility but it doesn't look the best and, yes, seams and ribs are an issue. I'd be curious what the special DuraVent kit entails.

Todd Miller
Todd Miller
Isaiah Industries, Inc.

3/10/2019
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