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About product and suppliers:
        Alibaba.com offers 51,932 double roof products. About 10% of these are roof tiles, 1% are waterproof membrane, and 1% are steel sheets. 

A wide variety of double roof options are available to you, such as plastic, steel. You can also choose from aisi, astm, and gb. As well as from free samples, paid samples. 

There are 51,932 double roof suppliers, mainly located in Asia. The top supplying country is China (Mainland), which supply 100% of double roof respectively. 

Double roof products are most popular in Africa, North America, and Domestic Market. 

You can ensure product safety by selecting from certified suppliers, including 14,057 with ISO9001, 3,749 with Other, and 2,877 with ISO14001 certification.