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Planter Boxes - Gripset C1P Liquid Membrane

Product and System Installation Requirements

The installation of the Gripset waterproofing membrane system should be carried out in strict accordance with relevant, current Technical Data Sheet (TDS). All other materials used in conjunction with the membrane system must be compatible and approved by the manufacturer. The membrane system is to be installed in accordance with recommendations outlined in AS4654.2- 2012 

1. Substrate Preparation

Substrates to which the membrane is to be applied must be structurally sound and stable. All building surfaces which the membrane system is to be applied are to be installed as per manufacturers recommendations, in line with relevant building standards in force at time of the application. Surfaces must be smooth, dry and clean. Rough surfaces, voids, hollows and surface depressions to be evened or filled first and all brick/block surfaces to be pointed flush. All movement joints to be filled with appropriate flexible sealant. All general surface defects including cracks to be filled and repaired – Refer to Gripset 11Y/DM repair mortar and Gripset SB Sealant. All surfaces are to be free of sharp protruding objects, loose material, de-bonded or existing coatings, curing membranes/agents, release agents, wax residues, foreign particles, laitance, algae and moss, grime, oils, animal fats, grease remains and any contaminants that could compromise the adhesion of the overlaid membrane system. Structurally unsound layers and surface contaminants are to be mechanically removed by abrasive blasting, blast tracking, grinding, high pressure cleaning or equivalent methods. Base of planters to have adequate falls to drainage, Concrete to be cured for a minimum 28 days and screeds left to dry for at least 7 days prior to the membrane application. Leak control flanges are to be rebated into floor surface enabling lip of flange to sit flush with surrounding substrate.

2. Priming System

Gripset 11Y Slurry Primer

High bonding, textured primer for porous and non-porous substrates. Apply 1 x coat by brush or roller at minimum 1mm thickness


  • Apply primer to total floor and wall surfaces, extending over wall onto capping sections
  • Apply primer to all PVC and metal fixtures, flanges and turn-ups of pipes/penetrations to where the membrane is to be applied

3. Detailing System 

Elastoproof B50 Joint Band: Elastic bond breaker joint band

Prefabricated Corners: Prefabricated 90° and 270° corners used with the Elastic Joint Band as the system bond breaker

Elastoproof Base Collars: Waterproof Elastic sleeves for sealing floor and wall penetrations

BRW PF Squares: Self-adhesive butyl square for sealing floor wastes and leak control flanges


4 Membrane System 

Gripset C-1P 1-part flexible cementitious membrane

Coverage: Apply 2-3 coats by brush or roller at total minimum coverage of 1.9kg per m2 forming a 1.5mm dried film thickness


  • Apply membrane to total floor and wall surfaces extending over walls onto capping sections
  • Dress membrane down into floor wastes and turn membrane up at and seal to penetrations and fixtures

5. Membrane Curing

  • Minimum 5 days before backfilling

6. Membrane Protection

  • Prior to backfilling with aggregate or soil, polypropylene/corflute protection board is to be applied over membrane to total wall and floor surfaces.
  • Drainage cells and Geofabric systems to be installed over corflute protection sheeting as required.

7. Flashing Details

  • Protective metal flashing, textured finish or capping tile to be installed over membrane to capping sections of planter box