Sovereign have a complete range of cavity drainage membrane for waterproofing new build and existing basements. Cavity drainage membranes are fixed to earth retaining walls so that water penetration can be managed via channels in the floor to a sump and pump which then diverts the water to external drains. This leaves the inside of the basement dry and habitable. Various membranes are available for internal and external fitting, along with drainage channels, fixings, sumps, pumps, jointing tape, rope and corner strip. The membranes can either be finished with dry lining on to battens with insulation between, plastered or dot and dabbed with plasterboard depending on the type of membrane fitted. Sovereigns’ range of membranes are BBA Approved and a free of charge specification is available for all contracts.