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Balconies & Decks Liquid Membrane Systems

Product & 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 applicated must be structurally sound and stable. All building surfaces which the membrane system is to be applied are to be installed as per manufacturer's recommendations, in line with relevant building standard in force at the 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 painted flush. All movement joints to be filled with appropriate flexible sealant. All general surface defect 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, greases remains and any contaminants are to be mechanically removed by abrasive blasting, blast tracking, grinding, high pressure cleaning or equivalent methods. Concrete to be cured for a minimum of 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 Selection

Gripset Express H20 Plus - Single part water based primer for sealing green mineral based substrates or surfaces with residual dampness.

Apply one (1) coat by brush or roller at a coverage of 1 Litre/8m2

Gripset GP Primer - General Purpose Primer for porous/absorbent surfaces. Apply one (1) coat by brush or roller at a coverage of 1 Litre/6m2. 

Gripset OP Primer - Speciality primer for non-porous, smooth and dense surfaces and fixtures. Apply one (1) coat by brush or roller at coverage of 1 Litre/10m2.

Gripset E60 Primer - Two-part water based epoxy primer for sealing green substrates or surfaces with residual dampness and negative hydrostatic pressure. Apply one (1) coat by brush or roller at coverage of 1 Litre/3m2. 


  • Apply primer to total floor area and turn up at perimeter walls to 150mm
  • Apply primer to window and door thresholds
  • Downturn primer over perimeter edge onto vertical fascias to drip rail where applicable
  • Apply OP 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 90o and 270o corners used with Elastic Joint Band as the system bond breaker

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

BRW PF Tape - Self-adhesive waterproof tape

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


4. Membrane System Selection

Gripset 38 FC - Single component, fast cure, fibre-reinforced SBR latex membrane

Gripset Express Multi Pro - Ultra-fast cure, handle rain in <60min

Gripset 2P - Two component, latex cementitious membrane


  • Apply membrane by brush or roller over primed areas to floors, thresholds, and wall upturns to minimum 150mm
  • Turn down membrane over balcony fascia onto drip rail where possible
  • Dress membrane down into floor wastes and turn membrane up at, and seal to penetrations and fixtures
  • A minimum of two (2) coats is required to achieve the recommended coverage


Applied at 1.5 Litres/m2 forming a 1.2mm dried film thickness

5. Tiling System Details


Gripset C-Bed - Pre-bagged, polymer enhanced screed

Sand/cement screed - sand/cement screed at 3-4:1 ratio enhanced with Gripset Latex Bonding Agent. Use 1-part Gripset 11Y to 4 parts water as mixing liquid for screed. 

Tile Adhesive

Important: Polymer modified tile adhesives must be used for direct fixing of tiles over Gripset wet area membranes. All tiling to be carried out as per AS 3958.1 - 2007 "A Guide to Installation of Ceramic Tiles"

6. Paver & Deck Support Systems (Paver Jacks) Details

Gripset LS Roof Coat - Non-slip, UV stable top coat


  • Apply LS Roof Coat by brush or roller over Gripset 38/38 FC membrane to floors and wall upturns
  • A minimum of two (2) coats is required to achieve the recommended coverage


  • Applied of 1.2 Litres/m2 forming a minimum 1.0mm dried film thickness

7. Flashing Details

  • Protective metal flashing, textured finish or skirting tile to be installed over membrane at wall upturns when pack/deck support systems are used