Posted Jul 12, 2022, 9:44 PM
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Registered User
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Join Date: Jul 2001
Location: Vancouver
Posts: 41,737
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Quote:
Originally Posted by Westbased
A little concerned the black cladding is going to warp overtime. It already looks kind of wavy in some spots.
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"oil-canning". We saw that on Park Boulevard (next to King George Hub) as well. It may be more obvious on darker coloured cladding.
Quote:
Originally Posted by officedweller
Ah, it's called "oil canning":
Quote:
Oil Canning In Metal Roofing: What Is It and Can It Be Fixed?
December 1, 2016 By Mike Gonet
Oil canning in metal roofing is visible waviness, bulking, or rippling of the metal that affects flat surfaces of the roofs between the standing seams. This problem affects all metal panels, including copper, zinc, steel, and aluminum. The degree of the waviness tends to change under different lighting conditions.
What Causes Oil Canning?
This problem occurs due to uneven stresses during the milling process. Metal roof production mills use rollers to form coils and sheets. These rollers have small gaps that separate them, not allowing proper distribution of the stress. Several types of stresses may contribute to oil canning, such as full center, wavy edge, and camber. Other causes of this problem include uneven roof decking, thermal expansion, improper storage and handling, poor metal roof installation, and movement of the supporting structure.
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Can Oil Canning Be Fixed?
The short answer is no. Very little can be done to correct oil canning in metal roofing, and there are no metal roof repairs to help with this issue. For extreme cases, the only solution is panel replacement. However, some flat pan tongue-and-groove wall panels that have waviness can be fixed by adjusting the internal supports to put tension on the face of the panel. Most importantly, the metal roofing company must be careful during the installation process. Be sure to hire a qualified metal roof installer, who is up to date on the latest product improvements and installation methods available to insure the threat of oil canning is significantly reduced or altogether eliminated.
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https://www.classicmetalroofs.com/blog/a...-roofing-what-is-it-and-can-it-be-fixed/
https://www.classicmetalroofs.com/blog/a...-roofing-what-is-it-and-can-it-be-fixed/
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You can see it in this Park Boulevard pic when you enlarge it:
Quote:
Originally Posted by EhJay
Photo by me: 2021/04/15
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Last edited by officedweller; Jul 12, 2022 at 10:59 PM.
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