Town on my case

We installed a Galvalum roof on our house 3 years ago and went through all the correct protocol with the town to do so. Last year a town employee (works in the building dept) drove by our house and noticed a reflection from our roof. He went to the office and looked up our permit. Our builder gave the town a materials data sheet describing the materials and paint to be used in our remodel including the Galvalum metal roof , but forgot to write roof replacement on the permit. They are capitalizing on this technicality. The town is now saying the reflectively of our roof is abnormal and is asking us to either treat the roof or replace the roof. The town itself has many buildings with metal roofs (some similar to ours) but is saying ours needs to be changed because it is too reflective. We have met with the town and shown them pictures of roof reflections from their roofs (including town hall) and other roofs in town but they are adamant that we have to treat or replace our roof. We met with the town at our house recently (a year since being sited) and they still think the roof is too reflective and needs to be treated or replaced. The town has treated many of their roofs with white vinegar to dull the sheen. This treatment voids the warranty and typically rusts the roof. We do not want that for our roof. The town said if we treated the roof they would have to come back and determine if it was acceptable or if we would need to treat it again. What the town can't determine and there is nothing written in their building codes stating what is an acceptable amount of sun reflection from a roof.

My question to the experts is, can sun reflection or glare from a metal roof be measured? Is there a level of sun reflection or glare from a metal roof that is acceptable by industry standards?

Thanks, frustrated home owner.

Thanks Todd.