METAL ROOF OIL CANNING - How to Lessen the Effect

[@joefran11]

Installed metal snap lock roof panrls have minor oil canning on roof. My concer is on the gable end the last panel is screwed every 12" along the edge with the z trim to support the gable trim witch is creating major oil canning what did I do wrong?

[@metalroofinguniversity7839]

With flat pan, it's really hard to say for certain. It could be the cutting of the last panel, or perhaps the fasteners on the Z Trim are a bit over-fastened. There's also a reality with flat pan metal - you can do everything right and still oil canning can occur.

[@theresamarian6575]

I just put on a new metal roof galvanized July and I just found like a lump in the canning middle area ---how does that get fixed or do I need a new panel??

[@metalroofinguniversity7839]

It depends on what caused it. There are a few things that can cause oil canning. Usually if it's just one or two panels then the cause may be the panel being over stressed or having too many screws installed too close together. If the panels were over stressed on installation you may try reinstalling it (if it's through fastened you'll likely need to replace it). Keep in mind oil canning is just an aesthetic issue and doesn't affect the performance of the roof.

[@therooftube]

thank you!! I needed that info :-)

[@theresamarian6575]

I called my contractor roofer told him about three panels with a slight lump he said they don't repair it . Then I contacted the county inspector supervisor they say it's normal it's how the roof is done it will shape it's form or something but it's normal on metal roofs. My thing it was not w a slight lump for several months we recently getting alot of wind heavy wind and rain I'm thinking it's air going g under the metal lifti g up the metal ---- what if it becomes with bigger lump??

[@metalroofinguniversity7839]

Light gauge steel is more susceptible to oil canning. If you have 29ga or 26ga steel you then it may be more noticeable and not be a cause for concern. I would keep an eye on it and if you notice the seams beginning to separate then that is definitely not normal and your contractor should fix it.

[@asm101]

Was this properly explained to you before the roof was installed? Did you sign a contract?

[@skipperruhl1430]

What is oil canning?

[@nickcollins5273]

Oil canning has entered the Chat

[@metalroofinguniversity7839]

Nick Collins has left the Chat

[@77.88.]

@@metalroofinguniversity7839 I would leave to!

[@77.88.]

If you can't make it right, go back to engineering!

[@willysnowman]

CTE Coefficient of Thermal Expansion