This document provides information on common building materials used in construction including cement, sand, bricks, and timber. It describes the manufacturing processes and key properties of each material. Cement is produced through mixing, burning, and grinding processes. Sand is obtained from rivers or seas and used as fine aggregate. Bricks are made from clay then dried and burnt. Timber comes from tree trunks and its quality depends on factors like density and lack of defects. The document also lists common types of each material and their uses in construction.