Manufacturers may offer multiple products with different substrates, finishes, and exposure terms. Comparing brand names alone can hide those distinctions. The exact model or system identification is necessary for meaningful technical and warranty review.
What to do next
Ask each bidder to list the proposed products and relevant documents. Resolve alternatives and substitutions in writing. Keep appearance samples labeled with the exact product so the selected color does not become detached from its underlying material specification.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.