Asphalt shingle batch problems (poll)

Without looking up the answer, do you know what asphalt shingle batch problems are and how to identify them?

I have taken your shingle courses.

  1. installing shingles from different batches on the same roof.

I call them lot numbers, but I guess it’s the same thing. Sometimes very prominent on roofs. You can definitely tell if the install was stepped or racked from the street.:shock: