CM8 Waterproofing Membrane

CMbba 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).

More about CM Interior Basement Waterproofing System

Product reference:  CM Interior Basement Waterproofing System.
Membrane: [CM 8]. – 8 mm stud height. Walls or floors. [CM 20]. – Walls or floors. [CM Floor].
Hanging (walls):  [Horizontal]. [Vertical].
Drainage:    [Aqua channel]. – 2 m rigid lengths. [Aqua drain]. – 50 m or 150 m coiled lengths. [Channel outlet]. – To sump. [Jetting eye].
Accessories: [Corner strip]. – Joins wall drainage membrane to floor drainage membrane. Self adhesive.

Guidance for CM Interior Basement Waterproofing System from Wykamol Group

Membrane

• Not suitable for horizontal soffits.

CM 8:

• HDPE. High density polyethylene with moulded compression studs.
• Compression (maximum): 150 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).

Drainage

Aqua 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.

Product code: CM8
Roll size: 41 sq/m (2.05m x 20m)
Colour: Blue

Downloads

• CM8 Data Sheet
• BBA Wykamol Waterproofing System
• Wykamol Membrane Installation Guide