Question

the areas where rainfall is heavy, the roofs are​

Answer 1

Answer:

The only solution to make roof in heavy rainfall regions are clay roof tiles. All other materials are bad in this region.

Explanation:

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Answer 2

Answer:

shingles, and clay half pipes. More modern materials include sheet metal, which tends to be the best choice, but requires advanced industrial processes to produce.

Not to be too harsh but this would seem obvious, even without a google search, unless our OP is trapped in the midst of the Sahara