Fasteners must suit the panels, substrate, environment, and specified assembly. Choosing a fastener only by appearance or length overlooks compatibility and installation requirements. Replacement hardware should not be assumed equivalent to the original.
What to do next
Ask the roofer to identify the required fastener specification and the reason for any substitution. Keep the information with maintenance records. Where deterioration is present, investigate surrounding components rather than replacing visible screws without assessing the larger detail.
Related Perkins guidance
Contact Perkins Roofing to discuss your roof and the appropriate next step.