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What is the optimal roof overhang size for an urban villa with a hipped roof?

We are building an urban villa with a hipped roof (roof pitch about 22°) with 2 full floors.

Now I became aware of the roof overhang problem. One of the suppliers called 15 cm sufficient. After studying the information on the Internet as positive aspects, in addition to appearance, mentioned the protection of the facade from moisture and shading.

What do you think?

• roof overhangs