Can't say I've ever heard them doing it when they cool down, but when the sun hits them in the morning, it can happen. If they're mounted to an aluminum facia, that can also transfer noise when expand ... read more
Big +1 to Abe's feedback.
He is 100% right on the differences.
Inserts can be done very effectively with no weak links in the system in a vast majority of the cases. Where it really pays dividends to ... read more