A manufacturer name is one part of a roofing specification. Membrane, insulation, attachment, edge details, flashing materials, and preparation must work together as an assembly. Two proposals using the same brand may include different work and warranty terms.
Ask which materials will be retained, what must be repaired first, what product and thickness are specified, and which inspections and closeout documents are included. Read the exact warranty terms rather than assuming a brand reference proves eligibility. The pages below provide context for those discussions. Share the roof condition or proposed specification to identify the questions still open.