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Best Metal roof flashing around Chimneys, Skylights, HVAC units - 138 T Standing seam metal roofing
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- Опубликовано: 13 мар 2020
- In this video you will be introduced to the best metal roofing flashing detail for chimneys, curbs, HVAC units, and skylights you have ever seen. This is not just some variation of another sheet metal detail, it's an entirely new way of doing metal flashings around roof top obstacles. It does not require a welded custom curb and can be taught to most sheet metal workers relatively easily.
All metal roofing, not just standing seam, has had to combat the problem of what to do when something blocks the metal pan and water is trapped behind the curb, chimney or unit.
Over years we seen just about every type of flashing job in failed attempts to stop leaks around units, chimneys and skylight including tar, caulk, metal roof coatings, spay foam, did I mention tar, caulk, and coatings?
Let me introduce you to the way metal flashings are done with the 138 T standing seam metal roofing, It is called the traverse panel detail. The idea is simple, instead bottlenecking water behind a roof top obstacle, we will divert the water to the sides with the same metal roofing panel as we used on the roof, the 138 T, hence the name traverse panel detail.
Heres how it works
Step 1 . We start off by roofing in the home or building with the 138 T metal panel and we don't have to make any real adjustment to where the metal falls in relation to the curb, skylight, chimney, etc. We simple cut the metal around the obstacles and use normal sheet metal techniques like bending the sides of the cut panel upwards to divert water away from the curb.
Step 2. We then install our Z flashing around the front of and up the sides of the curb so that our head wall and side wall trim can “hook up” to the Z . We don’t stop our Z behind the curb, instead we let it run up to and under where the ridge cap will sit.
Step 3. We start with the front apron piece of flashing making tabs on the sides of the curb. Then we jump to piece of flashing behind the curb. We make this piece of flashing out of a piece of the 138 T metal.
Step 4. To make the piece of flashing that goes on the back side of the curb we simply cut the leg of a piece of 138 T metal roofing panel and fold it until we have an a bend accurate to the roof pitch.
Step 5. We now know where the back piece of flashing is folded and we can install the side wall flashing and turn it up at the right point to make a good clean fit. Then we fold the shared edge of the the back flashing over the edge of the side wall.
Step 6 Next we use 1.5 “ roofing insulation to fill in the gap in the metal ands precede to install the rest of the travers panels making sure that there is buytle tape on the z and on the sides of the 138 t travers panels with the tab on the up hill side.
Step 7. We run the travers panels up to the ridge and cut the leg off the last panel and make a hem so that it can be covered by the ridge.
As you can see this type of flashing system is
-Easy to do
-Uses the same 138 T metal roofing as the roof
Takes the water and diverts it way from the curb
Totally leak free design
Even if screws fail they fail outside the system.
Doesn’t matter where or how metal falls around curb the flashing detail still works.
No custom curb needed- just the same 138 T metal from the roof.
This is just another one of the amazing features of the 138 T style standing seam
ARRON MOST OF YOUR STUFF IS PRETTY GOOD ,,BUT IF YOU PUT THAT ON MY JOB YOU WOULD BE TEARING OFF AND DOING IT RIGHT
Why? Now a heavy stream of water isn’t hitting the obstacle. Seems like a great idea.
i have been doing standing seam for over 20 years, this scream " i dont know how to do this" . if i ever did anything like this on a job i would be fired. it looks terrible.
hahaha! Same!
Thanks for sharing your knowledge
If it's just 1 or 2 panels from the ridge cap I think it's ok but for something like that I'd say you need to make a cricket
I am so impressed. Have you ever thought about would it be possible to lay the custom bent top side flashing to work with the transverse panels laid at a slight angle to direct the water to either one side or the other? My chimney is above a valley that constantly clogs with fir tree needles so I would have to think would it be better to direct all the water to the low side of the valley or maybe on purpose to the high side to wash it down. I have even thought about installing water jets at the top of these valleys so I can hose them down remotely before they get completely filled with needles.
Looks 👍🏾
could you use that detail on a 5/12 with the snap lock?
Also a standing seam roofer and I would never install that on a house roof. Looks terrible.
Looks better than a water failure, no?
What water failure? That’s not an option.
Put a fucking cricket there! lol
Has potential for sure
Where is the videos where you flash chimney on the top of a ridge?. As 90%+ chimneys are on the top ridge in older homes.
I guess no one on the internet knows how to do it.
I wonder
Why even bother to install the panels that you put the board in??
The "Z"
Cool idea but it looks like hell...
NOT A COOL IDEA,BUT I AGREE WITH THE LOOKS,,,WHY NOT JUST TAKE A PANEL AND FOLD IT OVER THE RIDGE,? IF LOOKS DON'T MATTER
No need for horizontal panels
Jeez. Not for me.
That chimney flashing system looks like crap, how is that even an option?? 🤦🏻♂️
I agree with Aaron it looks so ugly you cannot be doing this
Looks better than a water failure, no?
It does look like pooh, but if it keeps my roof from leaking then that's the important part. I got here because some jackass who installed skylights on my metal roof put the whole flashing under the metal. They sealed it with some dense rubber sealant and it worked for years i guess, but now it's leaking, meh!
You are trapping water and snow dude.
This is a unnecessary detail, I would never
Looks like it holds snow
Yeah that looks like sh!t...
Looks better than a water failure, no?
This is very unattractive. Kind of like reinventing the wheel.
😂😂😂 guy hasn’t done much metal roofing that’s for sure
Looks awful
No hate brother that looks terrible