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ARDEX WPM 750 Undertile Butynol  

ARDEX WPM 750 Undertile Butynol - Rubber Membrane Waterproofing System 

Undertile butynol specification

ARDEX WPM 750 (Undertile Butynol) is made up of synthetic rubber with properties which resist ageing from heat, sunlight and ozone and is heat weldable. Polypropylene filaments are welded onto both sides of the membrane for better wetting by water based adhesives. It has excellent gas impermeability and toughness and remains flexible at low temperatures. Laps and corners are to be heat formed and/or welded. Tiling can be done directly on the membrane after 60 minutes with many ARDEX tiling adhesives like X77, X56 STS8/E90, Quickbond/Abalastic, 2 part Optima or ABAFLEX. Undertile Butynol is marketed by ARDEX as a warranted undertile waterproofing product using solvent free adhesives and fixed by their trained and experienced approved Applicators. 

Undertile butynol material specifications 

  • Ardex requirements for long term warranty necessitate that the Undertile Butynol meets these typical technical 
  • Specific Gravity to ASTM D297: 1.30 +/-0.05
  • Hardness IRHD to ASTM D1415: 65 +/-5
  • Tensile Strength to ASTM D412: 4.86 MPa min
  • Elongation at break to ASTM D412: 300% min
  • Water Absorption to ASTM D471: 1.65% (by mass)
  • (for 1mm Butynol): 0.72% (by volume)
  • Water Permeability to ASTM E96-92 Vapour Flow Resistance (for 1mm Butynol): 12414 (MNs/g)
  • Vapour Flow Rate (for 1mm Butynol): 0.013 (g/m2d)  

requirements: Note: Interesting comparable figures for water permeability are: 

  • Polythene 156, Asphalt 1830, P.V.C. 4900.
  • K Values on 1mm Butynol sheeting
  • K Value (Thermal Conductivity): 7.4 x 103 Cal/cm/sec/deg C.  


  • Standard 0.5mm - For undertile waterproofing
  • RESISTANCE Undertile Butynol resists tearing, flex cracking, bubbling and abrasion. It is extremely strong, has a long life and is versatile.
  • PACKAGING In rolls of nominal 1.4m width and 20m long. Each roll is packed in polythene wrapper trademarked Undertile Butynol.  

SUBSTRATE SPECIFICATION Plywood & Timber Substrates must be dry when Undertile Butynol is applied. The plywood and timber substructure shall have a maximum moisture content of 20% when Undertile Butynol is adhered. NOTE: The use of LOSP (Light Organic Solvent Preservative)treated plywood must NOT be used under Undertile Butynol in any circumstances or conditions.

OTHER SUBSTRATE TYPES Fibre cement compressed sheet, closed cell polyurethane foam, wet wall linings i.e. Gib Aqualine, VillaBoard.

New Concrete Must be cured for a minimum of 28 days and all curing compounds removed prior to application. A reduction in cure time can be achieved by utilising the ARDEX HydrEpoxy System (consult ARDEX Technical Department for details)

Old Concrete Must be clean from any contaminants prior to application 


WPM 750 Adhesive: A specially formulated water based adhesive for most applications. plastic containers.

WPM 09A: The standard contact brushing, spray grade and rolling solvent free adhesive for fixing to the substrate. Supplied in 20L plastic containers.

Catalyst: Catalyst to assist adhesion in adverse conditions. 


Undertile Butynol when fixed according to ARDEX instruction will meet the NZBC requirements of B2.3.1(b) 15 years. Refer BRANZ Appraisal Certificate No 727 2011. 


When laid by an approved Applicator in accordance with ARDEX’s specifications, a material warranty for up to 20 years is available. ARDEX is not responsible for any costs arising from installation of the Membrane and does not provide any warranty other than where a written ARDEX material warranty has been issued. 


A warranty for workmanship shall be provided directly by the approved Applicator. The period and terms of the workmanship warranty shall be determined by the conditions of the contract or the approved Applicator. 


1. Preliminary Refer to the Preliminary & General Clauses of this specification and to the General Conditions of Contract which are equally binding on all trades. This section of the specification shall be read in conjunction with all other sections.

2. Scope This section of the contract consists in general of the provision and laying of the Undertile Butynol in wet areas.

3. Workmanship The whole of the work shall be carried out by skilled tradesmen using adequate and proper equipment and methods in accordance with best trade practice, and following the specifications methods and recommendations as laid down by the manufacturers.

4. Sub-contractors The work included in this section of the contract shall be carried out by a firm of waterproofing experts conversant with and specialising in the supply and fixing of this materials and shall be a firm approved by ARDEX.

5. Warranty When laid by an approved Applicator in accordance with ARDEX’s specifications, a written material warranty of up to 20 years is available. It is the responsibility of the approved Applicator to confirm proper installation and to request ARDEX to issue a material warranty on behalf of the customers following completion of installation. ARDEX is not responsible for any costs arising from installation and does not provide any warranty other than where a written ARDEX material warranty has been issued.

6. Materials

6.1 Undertile Butynol Membrane a. Shall be 0.5mm thick Undertile Butynol in all wet area surfaces, where membrane is to be overlaid with tiles.

6.2 Adhesives Shall be recommended by ARDEX specially formulated for Undertile Butynol and suitable for the particular application and the relevant temperature and conditions applicable.

7. Laying of Undertile Butynol  The Undertile Butynol installer shall check the substrate before laying any membrane to ensure that the surface is completely sound, screw fixed to specifications: screw heads flush, sheets spaced to provide for thermal movement or shock.

8. Completion On completion carefully and thoroughly clean off and remove all scraps and other rubbish from finished surfaces and leave in tidy order.

9. Extent of Work Observe the foregoing specification and supply and lay Undertile Butynol sheeting to all wet areas as shown and detailed in the drawing and in accordance with AS/NZS3740. Failure to comply with the above specifications will result in all warranties being null and void. 


The sub-contrator for the work called for in this trade will be a Company of Person approved by ARDEX. The approved installer shall examine all drawings and provide for the surface to which Undertile Butynol is to be fixed shall be clean, smooth, dry and free from sawdust, grit or sharp objects. Membrane laying shall not start until defects have been corrected. On completion the installer will provide the owner with a Workmanshop Warranty and obtain from ARDEX a Materials Warranty. Failure to comply with the above specifications will result in all warranties being null and void. 


Roll out ARDEX Undertile Butynol and cut to the measured length. Smooth ARDEX WPM 750 Undertile Butynol on contact to minimise air entrapment beneath the membrane. Floor sheets of ARDEX Undertile Butynol must extend up the wall at least 150mm. Make sure the Undertile Butynol is laid tightly into all corners. Wall sheets of Undertile Butynol should overlap the 150mm upstand. Weld seams and laps with the a suitable hot air welding gun. Roll with a rubber roller to ensure seams and laps are secure.

Walls, internal corners & transitions Apply the ARDEX WPM 750 Undertile Butynol membrane 1800mm up the walls or to a height of 150mm above the shower rose. For unenclosed showers the membrane must extend a minimum of 1500mm out from the shower rose. 

PROTECTION ARDEX WPM 750 Undertile Butynol is not suitable as a trafficable surface. ARDEX WPM 750 Undertile Butynol is compatible with undertile heating systems. For electric undertile heating, the wire must be covered by a thin screed prior to laying the membrane. It is the responsibility of the main building contractor to ensure all sub-trades likely to be working in the vicinity of the membrane are aware that a waterproofing membrane has been installed and all care must be taken to protect the membrane from damage. The tiler must lay tiles in accordance with best practice guidelines


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