Which are the male and female flanges of a metal roof panel?
Tuesday, February 23, 2021
The male side of a fastener-type metal roof panel, such as a 5V or PBR profile, looks the same as the female side—except that it has a short and flat extension at the end. The male flange fits into the female flange and sits under it. The male flange is also referred to as the underlap, and the female as the overlap. Here’s examples of it in three different profiles from a Gulf Coast Supply installation manual.
It’s important to get the lap sequence correct because the male (bottom) flange end provides a surface for the panel to bear on the roof sheathing. Also, the interlocking shapes are anti-siphon when lapped correctly.
As you may have guessed, the photo at the top is an example of how not to do it. The two arrows point to the edge of a male flange on top.
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