How To Look At A House

McGarry and Madsen's home inspection blog for buyers of  

site-built, mobile/manfuactured and modular homes

Can metal roofing be used on a low slope/pitch roof?

Sunday, August 5, 2018

The traditional metal roof types, such as 5V-crimp (shown above) and corrugated, are rated by the manufacturers for use down to a 3/12 pitch—three inches of vertical “rise” for every foot of horizontal “run.” Because of the shallow height of the undulating ridges of the 5V and corrugated profiles and the use of exposed metal fasteners to screw the metal to the roof deck, they are limited to a slope that will shed rain quickly. 

   But the taller profiles, like standing seam and PBR (shown below), can be installed on roofs with as low as 1/4” or 1/2”  in 12” pitch. Their fasteners are either  concealed or screwed at the top of a ridge, which makes them less likely to leak.

     A great place to learn more about all the different metal roof profiles, color choices, what minimum slope each profile is rated for, and installation standards is the Gulf Coast Supply and Manufacturing website at www.gulfcoastsupply.com

    Also, see our blog posts Which are the male and female flanges of a metal roof panel? and How do you flash skylight, chimney, and pipe vent roof penetrations on a metal roof?

 
     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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