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  • How to Install Pitch Transition Trim

  • How to Install Pitch Transition Trim


    Now we're going to look at something that does happen quite often. You'll have a steeper part of your roof turning into a lower slope, so there's a steeper pitch up top and a lower pitch on the bottom. We’re going to do a pitch transition or change. We need to do something where that change happens so the panels can go down, and water can come off, hit the lower slope and come off the roof.

    If you look here at the lower slope roof, you can see that we've already put panel on it and installed Z trim as we have been doing elsewhere on this project. The piece that's going to allow us to join the panels on the lower slope and the panels on the higher slope is the pitch transition flashing or the pitch change trim. It's the same piece, and I'm going to show you how to install that now.

    The piece that allows us to join the two different slopes is the pitch transition trim. We're going to install it over top of the panels that have already been installed on the lower slope. This allows water to flow off the upper panels, out over the trim, onto the lower panels and exits the roof at the eaves.

    I've already prepared this trim, and you can see beneath it that we're going to install it using Z trim, as we have throughout the rest of the project. I'll make sure to use tape seal in between the flashing and the top of the Z, and we'll use pop rivets for a concealed fastener installation. I'm going to do that now, and we'll come back and continue with the installation.

    Now that I've finished installing the transition trim, we can install an offset cleat so that we can clip our upper panels into it. We have our pitch change trim installed with an offset cleat on top of it, and we've made sure to use tape seal in between the cleat and the transition trim. I've also installed the small panels as we come across the top. You can see here that the panel is clipped into the offset cleat for a concealed fastener installation. I'm going to install a couple of screws, and then we can install our last panel.

    Earlier, we talked about how water hits the upper panel, flows down across the transition trim and onto the lower panel and exits the roof at the eave. That's exactly what we've done here. We would have water coming off this panel, coming across and over, down the roof, and exit.

    We're going to put the last panel on this section, and as you can see as I put it up here, clearly, it's wider than the space we have to fill, so I'm going to have to take off this rib, come back, and install it.

    I've installed the last panel on our pitch transition, and what we see here is how water flows off the upper panel, onto the transition trim, and onto the lower panel and off the roof. We've used an offset cleat for a concealed fastener installation, and now we can move on with our project.

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