| 1. Match the Metal to the Environment | Base metal and corrosion resistance | Identify whether the shingles use steel, aluminum, copper, or zinc, and review protective coatings, exposed cut edges, and fastener compatibility. | Coated steel is commonly selected for general residential use. Aluminum is often considered in coastal or high-moisture areas because it does not rust like steel. Copper and zinc have different appearance, cost, and maintenance characteristics. | Unspecified metal thickness, unclear coating information, or fasteners made from a metal that may cause galvanic corrosion. |
| 2. Verify the Roof Pitch and Building Compatibility | Roof slope, structure, and local requirements | Measure the roof pitch, inspect the roof deck and framing, and confirm compliance with local building codes and the product’s minimum slope requirements. | Metal shingles are not automatically suitable for every low-slope roof. The roof must have adequate structural support, a sound deck, suitable drainage, and properly designed flashing. | A proposal that ignores roof pitch, snow or wind loads, ventilation, deck condition, or permit requirements. |
| 3. Compare Installation Methods | Direct-to-deck versus batten installation | Determine whether the system is installed directly over the roof deck or over battens, and check the required underlayment, clips, fasteners, and spacing. | Direct-to-deck systems can provide a lower-profile appearance. Batten systems may create a ventilation space, but they can alter roof height and require careful detailing around eaves, valleys, walls, and penetrations. | Missing installation drawings, non-approved fasteners, exposed fastener heads without sealing details, or no plan for flashing transitions. |
| 4. Evaluate Weather and Impact Performance | Wind, hail, snow, rain, and fire resistance | Review tested wind resistance, impact classification where applicable, fire classification, snow retention needs, and the system’s drainage design. | Performance depends on the complete roof assembly, including panels or shingles, underlayment, clips, fasteners, flashing, and installation quality. Requirements vary by climate and location. | Claims based only on the metal type without test documentation for the complete assembly or without site-specific wind and snow-load information. |
| 5. Check Appearance and Thermal Details | Profile, color, reflectance, noise, and expansion | Request physical samples and review color-retention information, thermal movement details, roof ventilation, and insulation requirements. | Metal roofing can be installed with underlayment, solid decking, insulation, and ceiling assemblies that reduce rain noise. Lighter colors generally absorb less solar heat than darker colors, although overall energy performance depends on the entire building envelope. | Color samples viewed only on a screen, no provision for thermal movement, or promises of reduced cooling costs without project-specific calculations. |
| 6. Assess Maintenance and Repair Requirements | Serviceability and long-term upkeep | Ask how to inspect the roof, clean debris, repair scratches, replace individual shingles, and maintain sealants and flashing. | Metal shingles generally require less routine maintenance than many traditional roofing materials, but valleys, penetrations, fasteners, coatings, and areas exposed to debris should still be inspected periodically. | A system that requires walking directly on fragile areas, lacks replacement procedures, or relies on incompatible touch-up coatings and sealants. |
| 7. Read the Warranty Coverage Carefully | Product, finish, and installation protection | Separate the material warranty from the paint or finish warranty and any workmanship warranty. Check duration, coverage limits, transfer rules, maintenance duties, and exclusions. | A material warranty may address manufacturing defects, while a finish warranty may address problems such as excessive chalking, fading, or peeling. Workmanship coverage usually comes from the installer and may be separate from the manufacturer’s terms. | Verbal warranty promises, unclear prorating, no written exclusions, coverage dependent on an unverified installer, or no stated procedure for filing a claim. |