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20 Years Warranty 2 Layers Sheet Membrane System for Exposed Roof :  


WPM 114 is an APP (Atactic Polypropylene) plastomeric type modified bitumen membrane vented base sheet, consisting of a specially formulated bituminous compound of distilled asphalt modified with selected high-grade viscoelastic polymers. WPM 114 is suitable for application in all climatic zones, with excellent cold flexibility (-10oC) enabling an easy application and this also means the membrane is ideally suited for application in areas with harsh climates. The exceptional elongation properties of APP, combined with the strength and dimensional stability of the reinforcing, provides an excellent waterproofing membrane in roofing applications. WPM 114 is coated with a sanded polymeric film PE/PP, while the bottom surface has thermo-adhesive strips that activate with heat.  


  • BRANZ Appraised
  • European CE certification - GB06/69203
  • CodeMark AQ-030516-CMNZ
  • High flexibility during application at sub-zero temperature with no physical strains
  • High malleability
  • Accommodates structural movements
  • Resistant to chemical attacks
  • Withstand thermal shocks
  • Proven performance in colder regions
  • Good elongation and flexibility 



  • WPM 114 is used as part of a multi-layer system in roofing applications for waterproofing. It has been designed to be used in situations where there may be potential moisture issues in the substrate and can only be used as the base sheet of a multi- layer roofing system. WPM 114 membrane must be protected from UV.
  • Is a specially designed vented base sheet for use in a multi-layer waterproofing system.
  • Virtually eliminates bubbles and blisters forming underneath the waterproofing layer.
  • Allows vapour permeating through the deck to diffuse underneath the waterproofing where, ideally, vents should be installed to allow the vapour to escape to the atmosphere.
  • Eliminates the creation of stresses in the waterproofing layers, thus greatly reducing failures in the waterproofing caused by deck movements.
  • Is the ideal solution for controlled, partially attached first layer in a multi-layer system. 



Substrates need to be clean, smooth, dry and free of sharp edges, loose or foreign materials, oil, grease and other materials that may damage the membrane. All surface voids greater than 5mm wide should properly filled with an acceptable fill material. Ensure concrete substrate has been allowed to cure for at least 28 days before commencing application. The relative humidity of concrete substrates must be 75% or less before membrane application.  


The application of WPM 114 should be carried out by an approved Applicator. Installation shall be undertaken in accordance with all relevant technical information related to the selected installation method, including information contained within the specification. Prior to the application of WPM 114, the surface may require priming with WPM 240 (Shelter Primer). Coverage of primer will depend on the porosity of the substrate. WPM 114 is normally bonded to the prepared substrate with side laps of 100mm and end laps of 150mm. Overlaps shall be sealed by a torch. WPM 114 may be used in various combinations to produce a variety of specifications tailored to suit the individual waterproofing need. The exact specification will depend on functional and economic requirements.  


WPM 114 is not classified as dangerous goods. During installation, exercise caution when working with an open flame. Examine all surfaces to which the flame has been applied for smouldering or burning conditions. Do not use an open flame on or near highly combustible materials. Follow all local fire codes.  


All rolls of WPM 114 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 10 m Roll weight: Approximately 40kg Rolls per pallet: 23 .    

WPM 185  (Shelterbit Mineral Membrane) 4.5kg/m2 mineral coated APP bitumen membrane Excellent resistance to atmospheric agents Resistant to chemical attacks High puncture resistance   

Product Description

WPM 185 (Shelterbit Mineral) is an A.P.P. (Atactic Polypropylene) Plastomeric type modified bitumen membrane, consisting of a specially formulated bituminous compound of distilled asphalt modified with selected high grade visco-elastic polymers and reinforced with a combined reinforcement (Polyester and Fibreglass). WPM 185 is coated with a slate mineral granule topping, 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.   

Features and Benefits  

  • Positive vapour barrier.
  • Excellent resistance to atmospheric agents.
  • Cold flexibility 5oC.
  • Excellent elongation.
  • Resistant to chemical attacks.
  • Withstand thermal shocks.
  • Heat welded laps provide homogenous joint.
  • High puncture resistance.  



WPM 185 is used as a cap layer in exposed membrane systems (allowing light foot traffic for maintenance). WPM 185 is available in slate grey   


The application of WPM 185 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 185

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.  Note: when used as an intermediate layer over a base sheet, primer is not required.

A layer of WPM 185 (Shelterbit Mineral) shall be installed over all surfaces to be treated by LPG torch application techniques by an accredited applicator. The WPM 185 (Shelterbit Mineral) must be fully bonded 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.   

Safety Precautions

WPM 185 is non-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 185 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 8m
  • Roll weight: Approximately 36kg.  



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