Metal roof provides increased wind resistance when compared to other roofing materials. This is because metal roofing systems use interlocking panels. The disadvantages of metal roofs include the noise created from rain hitting the roof, and, in snowy areas, the tendency of snow to easily fall off the roof and onto pedestrians or property. Originally, metal roofs were made of corrugated galvanized steel: a wrought iron–steel sheet was coated with zinc and then roll-formed into corrugated sheets. Another approach is to blend zinc, aluminum, and silicon-coated steel. These products are sold under various trade names like "Zincalume" or "Galvalume". The surface may
Why Is the Crow Black-Coated Why Is the Crow Black-Coated Why Is the Crow Black-Coated () is the first Chinese animation in color produced at the Shanghai Animation Film Studio by Wan Laiming and Wan Guchan. The story is about a very arrogant bird that enjoys life. He sang and danced in the forest in China, showing off his beautiful tail to everyone. Autumn would come and the other animals in the forest are busy preparing food for the winter. The bird continues to live life leisurely. The winter would come instantly with a heavy snow storm. The bird is now homeless in the cold