• WP Flex 1K

    Article No. 044520

    WP Flex 1K

    Single-component flexible waterproofing grout

    Prüfbericht 5258/8964, 5269/9074
    Colour: grey | 0445
    Packaging unit

    Product specifications

    On delivery

    Ready to bear tiles (20 °C) After 12 hours
    Resistant to pressurised water Up to 2 bar
    Maximum grain size 0.5 mm
    Adhesion in composite with ceramic coverings and tiles 1.0 - 1.5 N/mm² with Extraflex
    Slurry applications At least 2
    Waiting time per application 3 to 4 hours at 20 °C
    Water requirement 4.0-4.5 l/20 kg
    Water load (20 °C) After 3 days

    The stated values represent typical product characteristics and are not to be construed as binding product specifications.

    Field of application

    • For use on floors/walls indoors and outdoors
    • Waterproofing in new buildings
    • WTA-compliant retroactive waterproofing
    • Waterproofing of plinths and base points
    • Waterproofing in a bond
    • Horizontal waterproofing in and underneath walls
    • Sealing containers


    • Flexible
    • Good adhesion to the substrate
    • Water pressure tight
    • High sulphate resistance and low active alkali content (SR/NA)
    • Can be applied as a grout and a filler
    • Low-stress and crack-free setting
    • Preparation
      • Substrate requirements

        Clean, dust-free and capable of supporting a load.

      • Preparations

        Remove projecting seams and mortar remains.

        Break off or slope corners and edges.

        Coves must be rounded out.

        Seal off indentations > 5 mm using a suitable filling knife.

        If necessary, provide damp proofing.

        Roughen the surface of plastic pipes with sandpaper; clean and, if necessary, sand metal pipes.

        Seal passing-through pipes by using the product to form a cove around them.

        Primer for untreated surfaces

        Apply Kiesol (1:1 with water) without pressure and avoiding nebulisation moving horizontally along the surface from top to bottom. Proceed by priming one limited area at a time.

        Immediately remove the product in excess.

        All follow-up working steps must be carried out wet-on-wet.

    • Application
      • By brush / mortar cover / trowel application
      • Application temperature: min. 5 °C max. 30 °C
      • Application requirements

        Temperature of the material, air and substrate: from min. +5 °C to max. +30 °C

      • Vertical surface waterproofing

        Apply the material in two layers on the previously prepared substrate.

        Apply the second layer once the first can no longer be damaged.


        Horizontal surface waterproofing

        Apply the material in two layers on the previously prepared substrate.

        Apply the second layer once the first can no longer be damaged.

        After the waterproofing has dried thoroughly, place two layers of PE sheet over the waterproofing before the screed is laid.

        At the edges, the waterproofing layer is applied up to the upper edge of the floor or up to the horizontal barrier.


        Connection details/building element joints

        Corners and connection joints in permanently wet areas should be bridged with the VF Water Stop System.

        Apply the material as a contact layer and work in Water Stop VF 120.

        The connection to rising building elements (e.g. windows and doors etc. that go down to the floor) is carried out using the self-adhesive SK Water Stop System and then finished with MB 2K.

    • Application instructions
      • Once it has hardened, mortar must not be made workable again by adding either water or more wet mortar.

        Protect wet mortar surfaces against frost, rain and drying out too quickly for at least 4 days.

        Mixing by hand and the mixing of partial quantities are not permitted.

        Waiting time for containers approx. 10 days.

        Apply waterproofing material to the side facing the water (positive water load).

        Rigid preliminary waterproofing is required in the case of moisture penetration from the rear.


        Protecting the coating

        Protect coated surfaces from damage.

        If the waterproofing material is used directly, a protective layer must be applied.

        Apply Kiesol to the waterproofing material to increase its resistance against liquid manure.


        Laying ceramic tiles

        Lay tiles once the waterproofing material can sustain foot traffic without being damaged.

    • Working tools / cleaning
      • By brush / mortar cover / trowel application
      • Mixer, wide brush, paintbrush, smoothing trowel, grout broom, filling knife

      • Clean tools with water while the material is still fresh.

    • Storage / shelf life
      • Protect form moisture
      • Shelf-life 12 months
      • If stored in an unopened container and in a dry place, the product will keep for approx. 12 months.

    • Usage
      • 1.3 kg / mm thick layer / m²
      • Approx. 1.3 kg/m²/mm

    • Application examples
      • Layer thicknesses and application rate for use in interior and exterior areas

        Load group
        Minimum layer thickness (mm) (dry)
        Application quantity of fresh mortar (kg/m²)
        Powder application rate (kg/m²)
        Yield 20 kg (paper bag) (m²)
        Waterproofing in and under walls≥ 2.0
        approx. 3.1
        approx. 2.6approx. 7.5
        Splashing water/plinth waterproofing≥ 2.0
        approx. 3.1approx. 2.6approx. 7.5
        Soil moisture and non-pressing water≥ 2.0
        approx. 3.1approx. 2.6approx. 7.5
        Standing seepage water and pressing water≥ 3.0
        approx. 4.7approx. 3.9approx. 5.0
        Water containers with water depths up to 8 metres≥ 2.0
        approx. 3.1approx. 2.6approx. 7.5
        Waterproofing in a composite system
        ≥ 2.0
        approx. 3.1approx. 2.6approx. 7.5

    • General information
      • The mixing water must be of drinking water quality.

        May contain traces of pyrite (iron sulphide).

        Low chromate content in accordance with Directive 2003/53/EC.

        The characteristic data of the product were calculated under laboratory conditions at 20°C and 65% relative humidity.

        Deviations from applicable regulations must be agreed separately.

        The relevant test certificates must be observed when planning and carrying out work.

    • Disposal instructions
      • Larger quantities of leftover product should be disposed of in the original containers in accordance with the applicable regulations. Completely empty, clean containers should be recycled. Do not dispose of together with household waste. Do not allow to enter the sewage system. Do not empty into drains.

    • Safety / regulations
      • For further information on the safety aspects of transporting, storing and handling the product and on disposal and environmental matters, please see the current Safety Data Sheet.

    Possible system products