Understand the system
A retrofit should address the existing assembly, occupancy and intended service life before selecting an exterior panel.
What to discuss
Gather roof records, known leaks, rooftop equipment and operational restrictions. Ask the project team to compare replacement and retention options against the actual condition of the building.
Build a clear scope
Define survey, design, temporary protection, trade coordination and handover responsibilities. A retrofit proposal needs more than a price for panels; it should explain how the existing building becomes the finished assembly.
Before selecting a contractor
Request the product documentation, a relevant scope, evidence of applicable qualifications and current coverage, and references you can check. Installation methods and warranty terms must be confirmed for the proposed project.