I just got an expensive standing seam metal roof installed (24 gauge galvalume with Kynar paint). After watching some installation videos online from expert installers, I noticed that my valley details are different. The installers inserted the panel pieces straight into what seems like a receiving channel installed on top of the valley pan.
What I’ve seen online is that the standing seam panels get bent over at the end and then tucked into an offset cleat, similar to what is done at the eaves line, where the panels are hemmed and locked into the drip edge profile.
I poured some water onto a panel that’s interlocked with the valley and observed the following: Some of it spilled over into the trough (as it should), some ran down the inside of the channel and collected at the eaves, where drip edge, valley and channel piece all come together. Notably, some water ran under the hem of two panels and dripped into the gutter approx two panel widths (32 inches) away from the valley center.
It doesn’t seem right to me, and I cannot find a single schematic on the web advertising this design. Am I well advised to ask the roofer to redo these valleys? I am afraid that water will flow under the panels and gather in places where it shouldn’t. In the long run, this cannot be good, right?
The rest of the installation is actually quite proper from what I can tell. I am nervous as this was a big money investment. I informed the roofer and am waiting for a reply. They’ve been really good throughout the process, so I hope they will be responsive to this concern.
Any advise is much appreciated!