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If you're under warranty, I think I'd take it in and at least have it documented. I agree that Keystone is likely to claim "cosmetic" and exclude it, but the OSB shouldn't be doing that and if it causes future issues, you'll be able to show that it occurred in the warranty period.
Why did they move to rubber?
1) Versus aluminum, it's certainly cheaper.
2) Versus fiberglass, it's certainly cheaper.
3) It's flexible, relatively easy to repair, relatively easy to maintain, relatively easy to install...
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