SIL-LOCK is an innovative PVC membrane designed for waterproofing subterranean areas such as basements, car parks, cellars, lift pits, tunnels and similar water retaining structures. The design of the membrane provides one face that is “T” shaped that provides a secure mechanical bond to concrete ensuring long term secure adhesion of concrete to the membrane. Furthermore the durability of T-Lock is a key benefit for critical underground applications with the ability to withstand mechanical damage, chemical spillages and weather resistance.