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20 Years Warranty Sheet Waterproofing Membrane System:  


Below Grade Positive Side

WPM 188 (Shelterbit Garden Tanking Membrane) 3.0mm SBS bitumen membrane Positive vapour barrier Excellent resistance to pollutants and aging Good elongation and flexibility For waterproofing planter boxes, garden beds, roof gardens and flower beds Contains root inhibitor - stops roots from plants damaging the membrane High flexibility during application at sub zero temperatures with no physical strain


WPM 188 is an S.B.S. (Styrene Butadine Styrene) torch applied modified bitumen waterproofing membrane, consisting of a specially formulated bituminous compound of distilled asphalt modified with selected high grade visco-elastic polymers and reinforced with a high quality combined reinforcement (fibreglass and polyester) and treated with preventive chemicals to stop roots from plants damaging the membrane. The exceptional elongation properties of SBS combined with the strength and dimensional stability of the reinforcing, provides an excellent waterproofing membrane for new and existing constructions. WPM 188 is coated with either a sanded or talc top surface finish, while the bottom surface is embossed and protected by a heat sensitive polythene film. This type of finish for the lower surface has been chosen for two specific purposes. 

  1. To act as a temperature gauge during application. When the film melts it shows that the compound is at the correct temperature. 
  2. The embossing is to allow the gases to rapidly escape when heated to its correct installation temperature avoiding possible problems of bubbling and blistering.   



  • Positive vapour barrier.
  • Excellent resistance to pollutants and aging.
  • High flexibility during application at sub zero temperature with no physical strain.
  • Maintains shape stability at high temperatures.
  • High resistance to perforation.
  • Resists root growth ingress into both the membrane and the laps.
  • Good elongation and flexibility.
  • Heat welded laps provide an homogenous joint.  
  • USES   
  • WPM 188 has been especially formulated for the waterproofing of:  
  • Planter boxes.
  • Garden beds.
  • Roof gardens.
  • Flower beds.
  • Green covered civil works etc.  


WPM 188 is used as a single layer or multi layer tanking membrane in horizontal or vertical applications, also for waterproofing balconies, terraces and flat roofs.   


The application of WPM 188 should be carried out by an accredited applicator. Installation shall be strictly in accordance with the manufacturer's recommendations. All surfaces to which the Shelterbit systems are installed must be properly prepared prior to installation. All surfaces must be clean, dry, smooth, and free of sharp edges, fines, loose or foreign materials, oil, grease and other materials which may damage the membrane. New concrete must be cured a minimum of 28 days prior to the installation.   

WPM 188 Apply to all surfaces one coat of WPM 240 Bituminous Primer at a coverage rate of 5 square metres per litre and allow to dry thoroughly. A layer of WPM 188 shall be installed over all positive side surfaces by LPG torch application techniques by an accredited applicator. The WPM 188 must be fully bonded to the prepared substrate with side laps of 7.5cm and end laps of 10cm. The membrane must be detailed in accordance with recommendations. Overlaps shall be sealed by torch. The WPM 188 membrane shall extend to at least 100mm above the backfill level. The top edge of the membrane shall be finished using an Pressure Seal to prevent ingress of water behind the membrane. After all membranes have been installed they shall be protected from mechanical damage by placing Protection Board against the membrane before backfilling. The board shall be fixed using PVC Duct Tape, do not use mechanical fixing that will puncture or penetrate the membrane.   


WPM 188 is hazardous; non-dangerous goods. However during installation, exercise caution when working with open flame. Examine all surfaces to which the flame has been applied for smouldering or burning conditions. Do not use open flame on or near highly combustible materials. Follow all local fire codes.   


All rolls of WPM 188 should be stored in a covered area protected against sunlight and UV radiation. Rolls should be stored in a vertical position on a smooth floor so as not to damage the edges.   


  • Roll size: 1m x 10m
  • Roll weight: Approximately 35kg
  • Rolls per pallet: 28  



The Technical Data shown below are the average results of the Tests, Measurements and Trials, carried out on WPM 188 Waterproofing Membrane.     

  • Length: 10m
  • Width: 1.0m
  • Thickness: 3.0mm
  • Aeric mass: 3.5 kg/m2
  • Heat stability: 90oC
  • Cold flexibility: -20oC
  • Tensile strength Ultimate longitudinal: 720 N/5cm, Ultimate transverse: 420 N/5cm
  • Elongation at break: Longitudinal 40%, Transverse 45%
  • Tear resistance: Longitudinal: 130 N, Transverse: 140 N
  • Reinforcement: 180 g.s.m.
  • Surface finishes: Lower torch film, Top torch film  
  • Note 1) Lower surface; the surface which is applied to the structure being waterproofed.
  • Note 2) Top surface; exposed to underside of covering membrane



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Waterproof Drainage Sheet

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