1) In general, an intermediary is a person or service that is involved as a third party between two or more end points in a communication or transaction.n the World Wide Web, the role of an intermediary is sometimes said to be no longer necessary as, for example, when you look up legal or medical information directly yourself or when you share files with other Internet users directly (see peer-to-peer).
A roof covers a building or home structure, protecting any belongings found within. There are a large number of materials that can be used to roof a building or home, including several types of metal roofing materials. These materials include steel, aluminum, copper and tin.
Raw materials. Concrete roof tiles provide an aesthetically pleasing, affordable, durable roof for life. The materials used in their manufacture are sources locally. River sand is mixed with a clean finer pit sand to provide the correct sand grading before 42.5MPa Portland cement is added and mixed with water.