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Ultraflex Liquid Waterproofing

Save £55.40 inc.VAT

Size: 15KG
Color: Grey
Sale price£117.60 inc.VAT Regular price£173.00 inc.VAT


ULTRAFLEX® is cold-applied, single-component, moisture-reactive, polyurethane liquid membrane that forms a continuous waterproof membrane that is perfect for waterproofing roofs. For new constructions and restoration work.

  • No Primer 

  • No Waiting Time 

  • No Wastage 

  • Useful life of over 25 years

  • Dark Grey

  • Roof Kits

High-Performance Liquid Waterproofing System - BBA certificated and NHBC Approved.

Roof Kits Available

ULTRAFLEX® is ideal for new constructions and restoration work.
Perfect for waterproofing roofs, terraces, balconies, car park decks, canals, drains, and more

ULTRAFLEX is designed to be used by industry professionals and used in conjunction with Ultraflex matting, the system forms a seamless membrane which can be applied to a variety of surfaces.

Torch-on membranes | Single ply | Plywood | Metal | Asphalt | Concrete | others

Ultraflex  Ultraflex Ultraflex
Introduction Videos



1 tin of ULTRAFLEX® can waterproof 8–10 m2, depending on the type of surface.

    Application Video
    • BBA certified for life in excess of 25 years.
    • NHBC and Green Roof Approval.
    • Ultraflex can be used on new or existing roofs, walkways, balconies, gutters, etc.
    • Ready to use straight out of the tin, application with solvent resistant roller.
    • Use fully reinforced with Ultraflex matting ensures easy ‘wet on wet’ application.
    • Can be used all year round – moisture curing.
    • Fully traffic-able when cured (24 hours).
    • Instantly rain resistant once the matting is encapsulated.
    • Once installed, forms a seamless membrane.
    • Excellent adhesion to different substrates: plywood, bitumen membranes, asphalt, metals, brick, concrete, wood etc.
    • Fresh concrete must be cured for 28 days.
    • 15-year guarantee for non-trained installers, 20/25 years for trained installers
    Application Overview
    • Check the substrate is clean and in good condition.
    • Application temperature must be between 5 – 35ºC.
    • All trims must be fixed prior to Ultraflex application.
    • Use Ultraflex sealant to seal any cracks or gaps.
    • Open the drum and stir before applying Ultraflex.
    • If product is left to stand on site, stir again before application.
    • Apply Ultraflex liquid as described below, first to details and perimeters and then to the flat area.
    • Apply Ultraflex liquid wet-on-wet by applying a generous coat of liquid first, then dry rolling the matting into the liquid and finally applying more liquid on top to achieve the required thickness. Ensure the matting is fully encapsulated without pinholes or tenting.
    • At this stage the roof is watertight and will resist rain.
    • Typical coverage is 8-10 sqm per drum although this may vary depending on substrate.
    • After applying the waterproofing layer, check for pinholes or any dry areas that may require more liquid.
    • Once the Ultraflex membrane is dry, apply a layer of Ultratop topcoat within 48 hours.
    • Check the full application sheet for specific substrates and systems.
    • On EPDM and TPO it is recommended to install a patch test to check compatibility.
    • Do not use silicone sealants. Always use ULTRA-FLEX sealant or other compatible PU based mastics.
    OSB Roof


    Carrier Membrane


    Corrugated Sheet


    Ceramic Tiles




    Concrete Roof


    Green Roof


    Paving Tiles


    Structural Waterproofing


    Application Video
    Pipe Application Video
    Ultratop Application Video

    Technical Information
    Specific gravity (kg/m³) 1.320 ~ 1.420 DIN 53 217
    Viscosity at 23ºC 2.650 cps ASTM D2196-86
    Dry extract >90 EN 1768
    Flash Point (ºC) 42ºC ASTM D93
    Ashes at 450ºC % weight 42 ~ 47% EN 1879
    Temperature 2ºC and rising and not exceeding 30ºC
    Hardness Shore A at 23º C > 75
    Tensile strength Reinforced with Ultraflex matting >10MPa *
    Dry time 2-8 hours. Fully traficable 24 hours
    Overcoat time ±5 ~ ±48 hours
    Elongation >400%
    Water vapour resistance µ=2.500
    Concrete adherence >2 MPa

    *UN-REINFORCED Tensile strenght >3MPa

    Warranty Information

    15 YEARS: Ultraflex and Ultratop at the recommended coverage
    20 YEARS: Ultraflex and Ultratop at the recommended coverage
    25 YEARS: Ultraflex and Ultratop at the recommended coverage. Extra layer required 0,5kg
    additional ultraflex
    Offered to the contractors who have attended to a training, not demo.
    Maximum length 20 years.
    Cost 5% of the contract value
    Must be requested prior to starting the job.
    The IBG requires the contractor to be credit checked by the insurance Company and approval will
    depend on his rating.
    10 years with ULTRAFLEX and ULTRATOP
    15 years with ULTRAFLEX and ULTRATOP + aggregate sealed with clearcoat
    20 years if protected with paving slabs
    15 year with ULTRATOP



    Ultraflex Data Sheet

    Ultratop Data Sheet

    Safety Data Sheet


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