Ripples in new roof

David Nichols
2/3/2014
This is a new install on a 20 year old house. They used peal and stick underlayment. Should the roof have so many ripples? Contractor stated it was normal because no roof is completely flat. You could see some unevenness in the old shingle roof. I’m concerned they over tightened the screws or the material is not correct. If its normal fine but if they screwed up I don't want to look at it for the next 30 years. Thanks David
Todd Miller
Classic Products, Inc.
2/3/2014
Did you have the opportunity to observe the panels for ripples before they were installed?
David Nichols
2/3/2014
Yes. They came bundled by length. All looked flat on the ground. But I didn't really pay much attention.
Todd Miller
Classic Products, Inc.
2/5/2014
They used a lot of fasteners which I suspect was required by code in your area. Unfortunately, it is what it is at this point. The number of fasteners is probably a contributing factor. Unevenness in the roof deck could be a factor. Over tightening the screws could be a factor. The thickness or other physical properties of the metal may be an issue. And, finally, there could have been an error in how the panels were formed but that does not appear to be the case. I have seen roofs that showed more ripples. This type of metal roofing is one that is more prone than others to ripples.

If you would like to reply to this thread, please log in. If you do not have an Ask the Experts forum user account, create one here.

Find a Contractor

Get Started Today

Take the first step to increasing the value of your home with a great looking, durable, fire resistant and energy efficient metal roof. Browse our list of qualified MRA Member Roofing Contractors in your area for a free consultation and estimate.