There are both physical and chemical methods for accomplishing damp proofing. The physical one entails sawing into the masonry and insert¬ing a damp proof membrane. There is the chemical method, which has been in use now for some 50 years. It involves drilling holes into the masonry and injecting a chemical damp-proofing agent that spreads out across the masonry to form a horizontal barrier. Our Company uses CPS-B37 composite, its main position is the horizontal proofing and that is structural composition contains Methyl group (CH3).