Anyone install an Excel chimney flashing?

Prof · May 17, 2019

So I have a fairly new house, and gone through some issues with chimney boot/flashing installs. Without going into a historical rampage, I have had two chimney sweeps (members of the guild) and one roofing guy install/repair the two chimneys. All were favorably reviewed and well recommended. Nevertheless, my chimneys still leak. Currently we have silicone boots installed. one is failing and the other has a slight leak. I'm planning on having an Excel chimney flashing installed by another roofing guy. I will be supervising this install very closely, but was hoping that some of you who have experience with Excel flashings will give me any relative tips.

I have a 12/12 standing seam Fabral roof. The chimneys are very close to the roof ridge--several inches from the ridge. See pictures for a visual. One is 6 inch (stove in basement) and one 8 inch for the masonry heater (1st floor). I look forward to ideas.

I know there are some fans of boots, but I've been down that road, and am uncomfortable with silicone boots that are heavily dependent upon sealants for a water-proof seal.

bholler · May 18, 2019

Prof said:
So I have a fairly new house, and gone through some issues with chimney boot/flashing installs. Without going into a historical rampage, I have had two chimney sweeps (members of the guild) and one roofing guy install/repair the two chimneys. All were favorably reviewed and well recommended. Nevertheless, my chimneys still leak. Currently we have silicone boots installed. one is failing and the other has a slight leak. I'm planning on having an Excel chimney flashing installed by another roofing guy. I will be supervising this install very closely, but was hoping that some of you who have experience with Excel flashings will give me any relative tips.

I have a 12/12 standing seam Fabral roof. The chimneys are very close to the roof ridge--several inches from the ridge. See pictures for a visual. One is 6 inch (stove in basement) and one 8 inch for the masonry heater (1st floor). I look forward to ideas.

I know there are some fans of boots, but I've been down that road, and am uncomfortable with silicone boots that are heavily dependent upon sealants for a water-proof seal.

If it is that close to the ridge I don't know what the issue is the flashing should run up under the ridge cap nothing special needed at all.

willoweep · May 18, 2019

I’ve spoken with Excel on this matter and they absolutely do not allow any rubber boot flashing with their pipe. They do make a metal roof flashing that has tabs that slip about an inch under the standing seam. I more typically use the regular flashing with a slit just wider than the boot, cut perpendicular to the fall line, slid under the standing seam. Sometimes it’s tricky because there’s a screw hiding under the seam that needs to come out. This one is Simpson but you get the idea.

begreen · May 18, 2019

Sorry to hear this Prof, I'm not a fan of flexible chimney boots. Excel's metal roof flashing is a good solution. They have instructions on how to install on page 30 here: http://icc-chimney.com/c/icc/file_db/docs_document.file_en/XLUSA-II_2012-01.pdf

Here are some Excel flashing installation pictures, including one with the top edge tucked under the ridge cap.
https://www.hearth.com/talk/threads/install-components.172594/#post-2314894

webby3650 · May 19, 2019

I’ve installed probably 100, maybe more excel metal roof flashings. It’s a fabulous product. We replace lots of failing/leaking rubber boots with these.

Prof · May 19, 2019

webby3650 said:
I’ve installed probably 100, maybe more excel metal roof flashings. It’s a fabulous product. We replace lots of failing/leaking rubber boots with these.

Great to hear. The flashing will straddle the two seams on either side of the pipe for the chimney on the right. However, it will only straddle one on the Chimney on the right. Any concerns about water getting under the side that doesn't have a seam in the way and getting down the hole? Also, do you caulk the gap between the pipe and the top of the flashing or just rely on the storm collar? I've taken a look at the installation directions--they look pretty straight forward. Anything not in the directions that would be good to know?

webby3650 · May 19, 2019

Prof said:
Great to hear. The flashing will straddle the two seams on either side of the pipe for the chimney on the right. However, it will only straddle one on the Chimney on the right. Any concerns about water getting under the side that doesn't have a seam in the way and getting down the hole? Also, do you caulk the gap between the pipe and the top of the flashing or just rely on the storm collar? I've taken a look at the installation directions--they look pretty straight forward. Anything not in the directions that would be good to know?

I caulk all around the the flashing, leaving several weep holes along the bottom edge of the flashing as a precaution. I also caulk between the pipe and the flashing before pushing the storm collar down into that bead of caulk. That prevents splashing water from the roof making its way in.

Prof · May 19, 2019

webby3650 said:
I caulk all around the the flashing, leaving several weep holes along the bottom edge of the flashing as a precaution. I also caulk between the pipe and the flashing before pushing the storm collar down into that bead of caulk. That prevents splashing water from the roof making its way in.

Thanks for your help!

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Anyone install an Excel chimney flashing?

Prof

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bholler

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willoweep

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begreen

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webby3650

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Prof

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webby3650

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