Metal roof penetrations

I have looked at a couple of metal roof installs in my area with penetrations flashed in this manner. I called out the last inspection, the roof contractor told the client it is installed correctly. Anyways, can you please look at these pictures and let me know what you think. I am not sure how the water that enters into the penetration is going to shed back out to the exterior side of the roof covering. Your thoughts and recommendations including how to write this up is much appreciated. Thanks.

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Try and find manufacture recommendations for roof penetrations. it does not look right to me, water can get under metal

It looks suspect. See below.

See page 3.

It’s possible that the the lower shingle is covering the bottom of a correctly installed vent flashing but I also question if the boot is properly sealed against the vent pipe and see a wrinkle in the boot near the top.

More info:

Metal roofs are not the old barn metal roofs anymore. They have been busy getting their products into the 21st century. I use this resource a lot.

Mark, I am not familiar with that product, but agree with you that it does not look right.
I would try to find out the Manufacture and do some research to back up you stance with the roofer.
Even better, get the roofer to prove to you by detail that it is correct. :slight_smile:

installed incorrectly write it up!

picture 2 shows that water can get under metal roofing. not that it maters but is this a re-roof over existing asphalt shingles?


We’re you able to access the area from the attic to see if there was any evidence of leaking? Putting a moisture meter on the suspect area could goca long way solving the question, in addition to looking at the mfg recommendations.

Jeff Tatlock

May not be allowed but then we are not code! :-;;

Metal roofing over existing asphalt shingles is not considered 2-layers by most code officials as the 2nd layer is metal and doesn’t add any extra weight… and so is often permitted, even in jurisdictions where only one layer is permitted. Complete tear-off not required. Old asphalt layer acts as metal roof’s underlayment.

There was no asphalt shingle(s) under this metal roof covering and as far as I could tell it was cedar shake/shingle prior to this installation. The penetrations in the roof covering did not appear to be leaking from the attic inspection. From the picture view it just does not make alot of sense to me how the water is not intruding. I was hoping someone could explain it to me. Perhaps there is/was non accessible sealant that is preventing water leakage but we all know what happens to sealant over time…

Yeah that sure looks like water would go between the metal and the rubber boot.

This is more direct

Page 3 for Details; :):smiley:

Installed properly, I think you would find additional blind metal flashings below doing the job if you were tearing off the roof. Your photo can not show the underlying flashing that may exist. This flashing keeps water from reaching the phelt paper, weeps out where the cosmetic metal roofing spot is, but also a sealant is applied too, so the water is shed down surface for years until sealant compromised. The custom flashing done properly, retains the ability to keep asthetics maintained. I have been doing these for 30+ years and have not had one leak yet. Check from attic to see evidence of leak from below penetration, if not, do not note as defect. With Asphalt we lexonite a cosmetic piece of shingle doing same.
Rhode Island Home Inspections 401-782-5589

I agree, but I also disagree (in red).

It the inspector cannot definatively state that the install is correct, he/she should make note of the issue on the report. Basedupon what I can see in the photo, and the OP’s statement in post#1, there is nothing else evident.

In this situation, I would not *not *note as a potential defect, because if you’re wrong, you’re screwed when it does start leaking.

You have observed, now notate.

Good points. I stand corrected.

It’s wrong. Even if using oversized panels, a metalsmith/roofer would modify the installation to ensure the water can exit the roof. I’ve never passed one of those, nor done one in a way that ensures water will go under the roof like that one does.