The waves may be the result of a lack of ventilation.

A neighbor did a 2nd course of shingles over a failing roof. 5 years later the redo failed and the roof "leaked as often a beer belly" so was torn down to the plywood and done again. Some of the plywood was replaced and the roof was completely re-done. Classic story about the results of a half-assed repair.

All the same: Sting

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Toyota is a leader only because their drivers block everyone behind them. Oh what a feeling.