The blue-gray rooftops of Paris get their color from zinc panels which were to start with set up within the 1830s. A wonderfully flat, zero-degree roof would possibly not be perfect for any making, which is why “flat roofs” are roofs with a very slight slope of about one-two levels. https://webchewy.com/finding-the-right-commercial-roofing-services-in-chicago-expert-tips-for-business-owners/