How To Look At A House
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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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Here’s links to a collection of our blog posts about METAL ROOFS:
• What is the difference between galvanized and galvalume metal roofing?
• What are the pros and cons of a standing seam metal roof?
• What is the average lifespan of a metal (galvalume) roof?
• Can metal roofing be used on a low slope/pitch roof?
• What are roofing purlins and battens?
• What is the stuff you paint an old mobile home metal roof with to extend its life?
• Why are there leaves in my attic?
• How do you flash skylight, chimney, and pipe vent roof penetrations on a metal roof?
• Is a metal roof for a mobile home approved for HUD Wind Zone 3?
• Can I install a new metal roof over an asphalt shingle roof?
• What is the code required minimum pitch/slope for a metal roof?
• What color metal roof is best?
• What is a cool roof made of?
Visit our ROOF AND ATTIC page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.
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