CM Interior Basement Waterproofing System Membranes, drainage and accessories for remedial interior isolation of damp basement walls and direction of surface water.
Water entering through walls is contained behind membranes and directed to drainage at base of wall. Requires sump and pump or equivalent passive water disposal system. (Sumps and pumps specified separately). Not suitable for horizontal soffits.
CM 8: HDPE. High density polyethylene with moulded compression studs. Compression (maximum): 120 kN/m². Suitable for basement walls or floors with active water penetration. Fixed to walls at 450–600 mm centres by drilling through membrane studs and inserting brick plugs. Horizontal laps: Overlap by three studs and seal with Rope seal. Vertical laps: Overlap flange area and seal with tape. Above DPC level, leave 20 mm gap to bottom of wall membrane and 10 mm gap to top, as ventilation for water vapour. Insert profile strips into applied finishes or offset skirtings and covings. Walls typically finished using dry lining. (Dry lining specified elsewhere). Loose lay to floors with studs down. Seal flanges using tape. Seal other edges using Overtape. Floors can be overlaid using expanded polystyrene insulation with T&G floorboards, conventional screed or anhydrite screed. (Floorboards or screeds specified elsewhere). DrainageAqua Channel: PVC drainage profile for perimeter drainage of basements. Designed for drainage of water contained behind Wykamol Cavity Drain Membranes and subsequent diversion to sump. Predrilled with 19 mm holes at 70 mm centres for water ingress. Suitable for use behind DPM to reduce water pressure. Can be fitted with jetting eyes for periodic flushing. Aqua Drain: 60 mm diameter drainage pipe for perimeter drainage of basements. Designed for drainage of water contained behind Wykamol Cavity Drain Membranes and subsequent diversion to sump. Fully perforated for water ingress. Fitted with continuous geotextile sheath to prevent ingress of particles. Lay below floating floor or screed and DPM. Lay in floorslab channel (w x h), 125 x 75 mm, filled with small grade aggregate. Suitable for use behind DPM to reduce water pressure.
