How to cut for penetrations in a metal roof. We are putting the metal directly over the shingles. Your shingles act as both barrier and insulation, and save a massive amount on your labor costs. Doesn’t matter if you are DIYing the project or paying someone. We all only have so much time.
00:00 You will usually need to cut the metal for roof penetrations
00:17 How you need to measure it
00:49 Marking the metal
01:45 Tip to cut out the penetration
03:30 We have all the tools, but try to give you ways to do the job with simple tools too
03:57 How to seal the flange over the metal ridges
05:00 Fasten from the middle and move out to keep it spread out
07:15 Why I don’t use sealant
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Okay, guys, there’s another delema that you run into is having to cut the penetrations for the roof. In this case it doesn’t fallout anywhere on. It’s going to go right over the top.
What I’m going to do again is to lap over, going to measure to show 4″ to 14. Then measured from the top need 13, which I can actually write there, make a mark and 23. That’s the area that I’m going to cut it and then I’ll show you how I cut. One of the ways that I can cut.
Okay, the 13 and the 4″. Let’s see a 4″ and a 14, actually. A four right there, right beside the rib. 14 right there, and then there’s a mark right here here, so we can… See the mark is right here. All right, so we have a square here, that we’re going to cut out.
Now, you can get snips and then cut it. But a lot of times it ends up being a real nuisance. Usually I use a sharper screwdriver than this, let’s see what happens. Using the hammer. To drive that edge through. We’re hitting that screwdriver. A lot of times it won’t go all the way through one side, from one direction. So you go…. There’s your hole.
So I have four different kinds of cutters at the Shears. I have the dual wheel, that spins different directions. I have nibblers, I have all kinds of cutters. You can use a saw and turn the saw blade backwards.
All of them have a risk of stuff getting in your eye. So this is not an old man. You, me? I’m old now, so you can do this without. Any special tools. We’re putting the vent over a hole that was cut. If you noticed the vent is much, the flange is much bigger than the ribs. So, what I do is I get the center of where that rib is going to be might no fall exactly in the center of the vent. And then I cut so that there’s a v, and then I can fasten these down. And these on the outside edge when it’s close like that I’ll let it get mashed down and fold it over.
But I’m going to do it on the top. Also. All right, and then when you fasten, you want to make sure you start in the middle, work your way out. That way. Everything’s so I’m spreading myself out. I’m going to go to the top.
You see how that vent, that v that I cut in that vent flange that’s around that metal to wrap down around. That way I can seal it all up, and it will have a good tight fit before you can get to sealing it. I don’t
recommend using a screw gun for a hammer.
I’m going to tell you something about sealant before I even show you how I do it. A lot of people, you’ve got some really high engineered and expensive silicones that come in tubes and they work, okay. Anything that
comes in a tube, is going to shrink and that’s why I quit using it. Because I got a ton of leaks and keep going back, because it shrinks after it dries. A little bit here and there. So I don’t do that anymore. No matter that companies are encouraging you to buy their thing.
So I’ll show you later how I seal it all up.