Guest User
4/7/2005
Experts, I’m having discussions with a client right now concerning “oil canning” on a standing seam metal roof. They are considering rejecting the roof because of visual deflections. The roofer I use is very reputable and I'm sure it's a good installation, however it does seem to have alot of dents. Does anybody have any thoughts on what is acceptable or within industry standards? Or is there a technique that my roofers should be using to minimize the “oil canning” effect. I’ve tried to explain it cannot be eliminated completely due to movement of the metal. I just don’t know what is considered excessive. Please advise. Homebuilder
Todd Miller
Isaiah Industries, Inc.
4/7/2005
There are numerous things which can contribute to oilcanning. Keep in mind, too, that oilcanning is not inherently bad by any means. Here are factors: 1) The flatness of the base metal 2) Gauging of the rollformer 3) Handling and transportation of panels 4) Condition of substrate (roof deck) 5) Proper fastening including not over-tightening fasteners There are no particular guidelines on oilcanning. You may wish to contact the roofing manufacturer and solicit their input and ideas.
Guest User
3/13/2008
oil canning is a common problem, as is deflection in the metal in the light a certain angles. This is usually not cuase for rejection by manufactures. You will always see some type of deformity in metal.
Guest User
3/19/2008
One option if you have not already done so is put the screw in the outer hole of the clip this will at least help. Also, if this is going over an already existing roof you may want to put your strapping closer together approximatel 12 inches apart instead of the standard 18. Oil canning will not go away completely but these techniques may help minimize it as much as possible.
Todd Miller
Isaiah Industries, Inc.
3/21/2008
Thanks. As far as screw placement in the clips, though, it is important to adhere to how the panel and clip have been tested.
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