Small leak from silicone chimney boot: can't seem to fix...next steps

[NorthernOne]

Good day!

So we put a steel roof on two years ago or so (time flies), I replaced our metal shroud with the silicone boot provided by the manufacturer. First season was fine, but likely some damage from sliding snow has caused a very small leak in a very specific place. I think I have given up trying to fix it, and want to move on to replacing the boot with something like we had before (all metal).

https://www.homehardware.ca/en/6-insulated-galvalume-roof-flashing-012-612-pitch-2-insulation/p/5533454?attributionToken=nwHwngoLCK6_t9MGENqUwz0QARokNmIwMTZjYjEtMDAwMC0yYmY4LTkzMmMtYjhkYjM4ZmJhMmIyKiRkMzhmYTRiMS01YTk1LTRjNzUtYWFlZi0wYWM4Y2M5NjQ5NjkyKJuVpDGo5aotwvCeFdSynRWOvp0VmNa3LZvWty2Q97Iw68-dOIffqTg6DmRlZmF1bHRfc2VhcmNoSAFYAWgBegJiaQ

I can't remember the exact size of the stove pipe, but would something like I have linked work if I get the right size?
I will make a separate post about snow proofing as that is another battle in my mind, I may also take one last stab at the leak.

Work in progress pic so you can see what we have going on, and the amount of snow I am dealing with.

Thank you for reading, and I look forward to posting more and hopefully solving this.

 

[begreen]

Consider getting a boot flashing made for metal roofs like the Excel model. It gets notched on the bottom to clear the seam ridges.

ICC Excel 6" Chimney Flashings

These are OEM ICC Excel 6" Chimney Flashings. These are new ICC chimney flashings that ship with original ICC packaging. These are not after-market

friendlyfires.ca

 

[Moose032]

I bought my house about 4 years ago and the chimney with a similar boot always leaked. The chimney needed to be replaced anyway so I had the whole thing replaced with a new flashing like the one posted above. It still leaked and I sealed it multiple times and couldn’t figure it out. It turned out that the screws in the metal roof had backed out and the water was running along the old shingles underneath and the chimney was the only opening for it to drain out.

 

[MaybeErnie]

I'm interested in this thread because I'm in the middle of installing a chimney through a standing seam metal roof. My chimney will penetrate the roof at a low point so I'll have lots of sliding and melting snow from above. It's also an area prone to ice dams. Not ideal.

It's interesting to me that the 2 installers I spoke with both pushed for using a high temp silicon boot like a Dektite or similar. They prefer them because they're relatively easy to install. However, the chimney manufacturer's support line (Duravent) was adamant that no silicone boot should be used for a stove chimney. Likewise for the advice I got on this site and from an online retailer. I have a metal boot on order but I confess that I'm very anxious about completing the install because this is surely one of those projects that is easy to get wrong the first time you do it. I know that every cut will need to be very precise and sealed perfectly.

Good luck to us both.

 

[begreen]

Personally, I would not install the silicone boot. Just look at the number of screws (ie holes) it needs to hold down. The Excel flashing is stainless. It requires about six screws. Properly installed, it will last as long as the chimney pipe, maybe longer.

 

[MaybeErnie]

Personally, I would not install the silicone boot. Just look at the number of screws (ie holes) it needs to hold down. The Excel flashing is stainless. It requires about six screws. Properly installed, it will last as long as the chimney pipe, maybe longer.

Yes! The part I ordered is Excel 6EMFA (the "6" just indicates the chimney ID) which appears to match the one in your images above. It's the only one I've found that comes with the raised lower edge and it seems to have the best reputation here and elsewhere I've researched.

 

[Tech Guru]

Those rubber flashings are not certified, too. A lot of metal roofing companies claim they won't warranty their roofs if you use anything else, but no chimney manufacturer will support their product running through one of these.

 

[Murray01]

Those rubber flashings are not certified, too. A lot of metal roofing companies claim they won't warranty their roofs if you use anything else, but no chimney manufacturer will support their product running through one of these.

Some are