Cementitious tanking durability relies on the preparation, type of substrate and the ability to hold back hydrostatic pressure. A properly applied system may be guaranteed for 5 years. Partial failure of the cementitious tanking generally cannot be repaired successfully, as the weakest part will always be on the joint between old and new. The installation of a Cavity Drained Membrane Systems would be the most reliable to protect against hydrostatic pressure. The specification can be designed taking into consideration the recommendations of BS 8102: 1990 (“Protection of structures against water from the ground”). The membrane products used in the construction of the Cavity drain System have a 30 year product warranty against degradation and usually a 10-Year Guarantee will be issued, protecting against the recurrence of water penetration. If you would like any more information, we would be delighted to assist you further.