When installing ridge cap shingles, what is a key alignment guideline for symmetry?

• A. Align with the centerline and ensure consistent overlap.
• B. Ignore centerline and stagger randomly.
• C. Place caps only at ends.
• D. Place caps on top of each other without overlap.

Answer: (A)

Symmetry comes from lining up each ridge cap with the ridge’s centerline and keeping a consistent overlap between caps. When caps sit along the centerline, the ridge line looks balanced on both sides, and the amount each cap overlaps the previous one is uniform. This not only creates a neat, even appearance but also ensures weatherproofing—the joints stay tight and water flows off the roof rather than seeping into gaps. If you don’t line up with the centerline, or you vary the overlap, one side will look lopsided and potential leaks or gaps can form. Approaches that skip the centerline, stagger caps, place caps only at the ends, or stack caps without overlap disrupt the symmetry and the sealing the ridge needs.