The starter course backs up and fills in the spaces between the butt seams or tabs of the first regular course of shingles.

Question

Quizplus · Accepted Answer

The starter course is designed to attach to the eave of the roof and provide a solid foundation for the first regular course of shingles, filling in any spaces or gaps between the butt seams or tabs. This helps to prevent wind-driven rain from getting beneath the shingles and causing leaks.

The Starter Course Backs Up and Fills in the Spaces