ARDEX Butynol

Synthetic Rubber Membrane for Roofing and Tanking

For use in exposed roofing and tanking applications, ARDEX Butynol is a synthetic rubber membrane with properties which resist ageing from heat, sunlight and ozone. It has excellent gas impermeability and toughness and remains flexible at low temperatures. ARDEX Butynol protects against water, moisture vapour, gases, sun, ozone, frost, acids, chemicals and bacteria.
  • Overview

    Why we like it: ARDEX Butynol is a durable, easy to install and flexible membrane. It is only requires a single sheet for a 20 years warranty, making it cost effective for large span roofs. Being of synthetic rubber composition, its elongation properties far exceed that of bituminous sheet membrane systems, making it a good option as a loose laid membrane where building movement is expected.


  • Description


    • Roofing.
    • External balconies and decks (protected from foot traffic).
    • Gutter linings.
    • Water containment (i.e. pillow tanks, reservoirs, pond liners).
    • Below grade applications.


    • Single-ply, flexible synthetic rubber membrane.
    • Superior weatherability.
    • Potable water AS 4020 certificate approved.
    • High tensile strength and resistance against tearing, flex cracking, bubbling and abrasion.
    • UV stable.
    • Protects against moisture vapour, gases, sun, ozone, frost, acids, chemicals and bacteria.
    • Extremely strong, long lasting and versatile.
    • No maintenance required.
    • Conforms to AS4654.1 - Waterproofing membranes for external above-ground use: Materials.
    • Up to 20 years written material warranty.
    • Gauges available: 1.0 mm, 1.2 mm, 1.5 mm.


    Butynol is manufactured by combining the petroleum gases isobutylene and isoprene at the extremely low temperature of – 100°C (Rubber Technology–Morton). Butynol is marketed by ARDEX as a warranted roofing and tanking product and fixed by their trained and experienced Approved Applicators.


    • Building Code of Australia allows use in all building types under Specification C1.10, Clause 7(e), except in bush fire prone areas.
    • Butynol when laid by a ARDEX Approved Applicator is only covered for up to 20 years if a written material warranty has been requested and provided.
    • All Adhesives and Solvents are HIGHLY FLAMMABLE.
    • Temperature and Humidity: The evaporation of any solvent adhesive system causes a drop in temperature at the interface. At times of high humidity this can result in a micro molecular water layer at the interface which will result in a failure to bond, falsely attributed to adhesive failure. Fixing should not proceed under these circumstances.
    • In cases of extreme absorbency, a priming coat of full strength ARDEX WA 98 Adhesive may assist water shedding and absorption. However, a follow up of full strength adhesive for full bonding should not be proceeded with under four hours, thus allowing full evaporation of solvents absorbed into the substrate. Primers must be time dried not touch dried.
    • As new substrate materials continually appear on the market, consult ARDEX for approval of their use with Butynol.
    • Where periodic ponding is likely and on roofs with a slope of 5% or less, ARDEX Seam Tape and ARDEX WPM 299 Seam Primer must be used on all joints.
    • Laps can be formed on roofs with a pitch greater than 5 with normal brush grade substrate ARDEX WA 98 Adhesive. Laps must be solvent wiped with ARDEX WA 985 solvent prior to applying adhesive. They must however at all times drain dry and have no periodic ponding.
    • Do not use in temperatures less than 6 deg C.
  • Performance



    • Building Code of Australia allows use in all building types under Specification C1.10, Clause 7(e), except in bush fire prone areas.
    • All Adhesives and Solvents are HIGHLY FLAMMABLE


    VOC Content: 30 g/L (DOWNLOAD Test Certificate)

    • Green Star IEQ-11 & IEQ-13
  • Compliances and Accreditations


    • AS 4654.1 (unverified)
    • AS 4020 (unverified)
    • Building Code of New Zealand (verified)


    Third Party Verification

  • Systems & Installation


    General (20 year warranty)

    Primer: ARDEX WA 98
    Membrane layer: ARDEX Butynol (1.0 mm / 1.2 mm / 1.5 mm)

    Tile adhesive: If direct sticking tiles use ABA Optima two-part adhesive.
    Loose Laid: Layer of geotextile fabric followed by 30-40 mm rounded gravel up to 50 mm deep.


  • Compatible Products

    ARDEX WA 98

    Solvent-based roofing contact adhesive for ARDEX Butynol waterproofing systems

  • Spec Clause

    Spec Clause


    Refer to the Preliminary and 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 all the Butynol rubber, for the roofs, decks, gutters and flashings on the buildings. Refer to Clause 12 hereafter for Extent of Work.


    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.


    The work included in this section of the contract shall be carried out by a firm of roofing experts conversant with and specialising in the supply and fixing of this material and shall be a rm approved by ARDEX and the architects.


    The Butynol roofing contractor shall furnish to the main contractor a written guarantee that the Butynol rubber roofing, guttering and flashing together with the adhesives employed will remain watertight and free from any defects that permit the entry of water for a period of twenty (20) years after the installation of the product. Such guarantee shall cover the making good of any defects that may occur from defective materials. The roofing contractor shall obtain from the manufacturer of Butynol rubber sheeting and the adhesives a guarantee covering their materials and shall deliver the guarantee to the Architect. The Butynol Installer shall during the course of this subcontract and at completion make a thorough inspection of the works in order to undertake to furnish a written statement to the main contractor to the effect that all the Butynol roofing, gutters and flashings have been inspected and passed as being fixed strictly in accordance with ARDEX recommendations and instructions and best trade practices.


    6.1 Butynol Rubber

    (a) Shall be 1.0mm thick standard Black Butynol rubber to all roof surfaces, gutters and fascias and walk out decks where membrane is to be overlaid with tiles.
    (b) Shall be 1.5mm thick Butynol to all walk out decks.

    6.2 Adhesives

    Shall be as recommended by ARDEX specially formulated for Butynol rubber and suitable for the particular application and the relevant temperature and conditions applicable. Generally the normal adhesive for substrate and lap bonding shall be ARDEX WA 98 Adhesive. Primer for lap bonding shall be ARDEX WPM 299 Seam Primer used in conjunction with ARDEX seam tapes. When conditions are experienced that are outside the temperature and/or moisture ranges recommended by the manufacturers for the above standard adhesives work will cease.

    6. Seam tapes

    Shall be as supplied by ARDEX and shall be uncured Butyl Cold Gum tape (Refer ARDEX seam tape). For general lap bonding the tape shall be 50mm in width.

    6.4 PVC tape

    All Plywood joints shall be taped with an approved PVC pressure sensitive self adhesive tape of 25mm width or ARDEX approved alternative.


    Shall be 1.5mm thick Butynol for all deck surfaces. All decks to which Butynol is to be fixed shall be clean, smooth, dry and free from dirt, grit or sharp objects. All decks, concrete or sheet materials shall be primed with 50/50 ARDEX WA 98 and ARDEX WPM 290 solvent. The Butynol roofer shall co-operate with the other trades laying the decking to ensure that the final surface is in first class condition for the laying of the Butynol rubber roofing.

    On concrete decks arrange to prime the decks after initial curing again to immediately cover by roofing or the provision of temporary waterproof covers. The Butynol roofer shall check the deck before laying any Butynol to ensure that the surface is completely sound, screw fixed to specifications: screw heads flush, sheets spaced to provide for hydro expansitivity, and if plastered concrete that there is no drumminess.


    All surfaces to which Butynol is to be fixed shall be clean, smooth, dry and free from sawdust, grit or sharp objects. Plywood must be sanded on one side and free from knots. CD Grade Construction Plywood as specified in NZS 3602:1995 Table 2B Amendment No. 1 August 1996, and in conjunction with Australian/New Zealand Standard 2269:1994. Sarking should be overlaid with Plywood, giving an ideal laying surface.

    For normal conditions the Plywood substrate should be 17.5mm and fixed with 3mm gaps between all sheets,
    and counter sunk screw fixed to Plywood manufacturer’s specifications. Fixing centres: edges 150mm, intermediates 200mm. Note that there may be a requirement for closer screwing of the Plywood substrate to suit the particular situation. Plywood is to be laid with the face grain at right angles to the supports. Where roofs are over damp conditions adhesive fixing should be used with screws. Plywood must have sufficient ventilation. Insufficient ventilation will require treatment in line with NZS 3602:1995 Table 2B Amendment No. 1 August 1996. Refer to Plywood manufacturers for screw specification. Staples and nails are not suitable in any circumstances. NOTE: The use of LOSP (Light Organic Solvent Preservative) treated Plywood or composite boards of any type or density must not be used under Butynol in any circumstances or conditions.

    Joins in plywood sheets are to be taped using 25mm Polyethylene tape. Plywood substrates with right
    angled internal corners should have a triangular fillet 50mm x 50mm screwed to each corner. External corners should be rounded to reduce wear on edges and allow an improved finish.

    Downpipe outlet holes should be drilled through timber boxed gutters and decks before installation. Butynol must have a 150mm minimum upstand on decks, therefore provision must be made for timber backing. It is important to leave doors and windows out until Butynol has been fixed. A steel trowel finish is required on all concrete surfaces. New concrete must be cured a minimum of 28 days prior to Butynol installation.

    If any patch or filling of substrate is required it is best to use a fibreglass material, or an ARDEX floor laying compound to resist the heat absorbed through the black Butynol, so it will not break up causing bubbling.

    Pumice surfaces are not recommended as a suitable substrate for Butynol. Light weight concrete surfaces require saw cut grooves for venting purposes.

    On large areas of Plywood, sheets may be preprimed before being screwed to roof framing, to speed the application of the Butynol. Temperature on the substrate surface must not drop below 6°C for adhesives to go off.


    It is the responsibility of the Applicator to ensure that the surface to be covered by the Butynol is in fit and proper condition, suitable in all respects for the laying of the material. Tape all joins in substrate sheets with 25mm wide PVC pressure sensitive tape or ARDEX approved alternative. Apply adhesive to the substrate and the underside of the Butynol rubber sheeting by brush, spray or an approved type roller at a spreading rate of generally not less than 2.5 square metres per litre. Leave to tack dry observing the minimum and maximum allowable times set by the adhesive manufacturer, before bonding the two surfaces together. Lay sheeting by drawing back halfway either longitudinally or transversely. Thoroughly roll or work over the surface of the sheet to exclude all air and to obtain a full bond. In general - all Butynol sheeting shall be laid out on the roof to “relax” the sheeting before fixing. A period of at least 20 minutes is usually required. Do not finally position sheeting with a tension exceeding 2%. All sheeting to the roofs shall be laid out as indicated on the roof plan, ie, at across the slope to an even Patter. End laps shall be avoided wherever possible but where necessary to the Architects approval. All roofs and/or gutters shall be “lap bonded” at all joints. Lap bonding shall be with ARDEX Seam Tape and ARDEX Seam Primers.

    Bonding Laps with ARDEX Seam tape and ARDEX WPM 299 Seam Primer

    Following laying of the Butynol the laps must be sealed. Roofs with a pitch of less than 5° and all guttering and areas subjected to periodic ponding require special lap bonding.

    1. The top lap is positioned and the bottom sheet marked to indicate the edge of the top sheet.

    2. The top sheet is folded back.

    3. The ARDEX WPM 299 Seam Primer is then applied to the Butynol in the area marked on the bottom sheet and 50mm in from the edge on the top sheet. The ARDEX WPM 299 Seam Primer is applied to the mating surfaces using a synthetic scrubbing pad. Scrubbing pads should be replaced as they become dirty. Allow the primer to become ‘dry to the touch’.

    4. Position and unroll the 50mm ARDEX Seam Tape along the seam. The edge of the release paper should be aligned to the mark on the bottom membrane sheet.

    5. Roll the length of the seam with the release paper still in place.

    6. Remove the release paper from the ARDEX Seam Tape by pulling at a 45° angle away from the seam. Keep the release paper low to the roof surface as it is removed.

    7. Fold into place the primed edge of the top sheet.

    8. Roll the completed seam.


    To direct fix tiles to Butynol, ABA Optima two part adhesive should be used. Ensure the Butynol surface is clean and dry before applying the adhesive. All laps must have seam tape.


    The Butynol roofing contractor shall ensure that his fixers only work on the Butynol roofing with soft sole shoes. The Butynol roofer shall co-ordinate with the main contractor who shall ensure that any other trades who work over the completed roof wear soft sole shoes.

    Upon completion of each area the roofer shall get the main contractor to inspect the area and the main contractor will sign off that the area was free from any defects or damage. It is then the responsibility of the main contractor to ensure the Butynol roofing is in no way damaged by other trades.


    On completion of this roofing carefully and thoroughly clean off and remove all scraps and other rubbish from finished surfaces and leave in tidy order with the whole roof waterproof and in first class condition.


    Observe the foregoing specification and supply and lay Butynol rubber sheeting to all roofs, decks, gutters and flashings as shown and detailed on the drawings.

  • Projects & Installers

    Project Showcase

    Christchurch International Airport, NZ

    ARDEX Butynol used to seal the flat plant deck rooftop.



    Te Wharewaka O Poneke, Wellington

    1000m2 of 1.5mm Dark Grey Butynol was used in the hidden and exposed gutters of this complex roofline.



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