How much is the roof waterproof and thermal insulation per square meter?

Generally, to achieve good waterproof effect, it must be 80+. The reason why many roofs leak water after a few years is that waterproof materials have poor resistance to thermal expansion and cold contraction, so to achieve the effect, you can choose nano-scale waterproof coatings. Now there is a coating, ultra-thin, waterproof+thermal insulation will not exceed 3 mm