We recently had our roof replaced and the roofer in error did not stagger the starter course and the overlay top course resulting in the ends lining up on top of each other. He is suggesting that the starter course underneath the first layer of shingles be bridged with a new starter course as to off- set the waterlines.
Is this good practice? I think it will also effect the appearance. Is there a better alternative? strip of metal?
We live in Massachusetts, so ice dams, roof leaks are a great concern.
These are 50 year premium architectural shingles. We have used this roofer twice before and were surprised by the mistake from his crew.