Replies

1. 
   davidmeiland | Apr 15, 2007 07:20pm | #1

   I'd say no. I have a 24-gauge 12" rib roof on my shop and it doesn't oil can much at all, maybe just a hair if you really stare at it. I think the reason is that it was installed in the heat of summer, when the panels are their widest, and so any movement is shrinkage, which puts them under slight tension. It may also have to do with the interlock detail, not sure about that.

   I have seen plenty of oil canning on what I think are 26-gauge roofs. A client of mine has a metal roof where the ends of the pans were folded under 180 degrees, locking over the drip edge, and it looks very flat although the thicker ends are not as clean looking to my eye.

1. 
   dockelly | Apr 15, 2007 08:12pm | #3

   I see alot of commercial applications around here and have seen some oil canning. Wondered how long it lasts, guess that depends on the weather.

2. 
   seeyou | Apr 15, 2007 08:12pm | #2

   They do it worse when they're new and more when they're laid when it's cold. They'll oilcan less as time passes, because they eventually move themselves into a more "comfortable" position. The thicker the material, the less visible the oilcanning will be.

   http://grantlogan.net/