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What is an easier alternative to shingles?

The roof is about 30 years old and urgently needs to be replaced, the substance is no longer adequate.

Unfortunately, because of the weight, installing shingles is not possible. The maximum weight is about 15 kg / sq. m.

Does anyone have any experience with alternative roofs for residential buildings where shingles cannot be used – because of the weight?

It would be important to me that it is not as noisy, especially when it rains in an apartment building, which can be the case with a metal roof.

• germany
• shingles