• WP Flex 1K

    Article No. 044515

    WP Flex 1K

    Single-component flexible waterproofing slurry

    0445 | grey
    Size / Quantity

    Product specifications

    Ready to bear tiles (20 °C) After 12 hours
    Maximum grain size 0.5 mm
    Adhesion in composite with ceramic coverings and tiles ≥ 0.5 N/mm² with FL Fix
    Layer thickness Max. 2 mm dry per application corresponds to approx. 2.3 mm wet
    Slurry applications At least 2
    Waiting time per application > 4 hours at 20 °C
    Water requirement Approx. 3.8 l/15 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
    • Subsequent exterior waterproofing in existing buildings
    • Horizontal waterproofing in and underneath walls
    • Waterproofing of plinths and base points
    • Waterproofing in a bond
    • Container sealing up to max. 3 m filling height


    • Very low emissions (GEV-EMICODE EC 1Plus)
    • Flexible
    • Good adhesion to the substrate
    • Can be applied as a grout and a filler
    • Water pressure tight according to DIN EN 14891
    • Preparation
      • Substrate requirements

        Load bearing, clean and dust-free.

        Roughen non-mineral and pore-free substrates.

      • Preparations

        Remove projecting seams and mortar remains.

        Break off or chamfer 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.

        W1-E: seal pipe penetrations by using the product to form a cove around them.

        Prime absorbent mineral substrates with Kiesol MB.

        Immediately remove excess product.

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

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

        Horizontal surface waterproofing

        Apply the product 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

        Bridge corner and connection joints with the Tape VF joint tape system.

        Apply the product, embed Tape VF over the entire surface, ensuring that there are no bubbles or creases.


    • Application instructions
      • In the case of liquid-applied waterproofing materials, direct sunlight and/or wind exposure can cause accelerated skin formation and accompanying blistering.

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

        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.

        Protect the fresh waterproofing layer from rain, direct sunlight, frost and condensation water.

        Protect the dry waterproofing material from mechanical damage.

        Add a further load-distributing layer if using the product for waterproofing under raised floor supports.


        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
      • In unopened original containers stored cool, dry and protected from frost for 1 year.

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

      • Apply to a large enough trial area to determine the precise amount required.

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

        Water impact classes according to DIN 18533
        Minimum layer thickness (mm) (dry)
        Application quantity of fresh mortar (kg/m²)
        Powder application rate (kg/m²)
        Yield 15 kg (PE sack) (m²)
        Waterproofing in and under walls≥ 3.0
        approx. 5.2
        approx. 3.9approx. 3.8
        Splashing water/foundation waterproofing≥ 3.0
        approx. 5.2approx. 3.9approx. 3.8
        Ground moisture and non-pressing water≥ 3.0
        approx. 5.2approx. 3.9approx. 3.8
        Standing seepage water and pressing water≥ 3.0
        approx. 5.2approx. 3.9approx. 3.8
        Water containers with water depths up to 3 metres≥ 3.0
        approx. 5.2approx. 3.9approx. 3.8
        Waterproofing in a composite system with tiles and panel coverings (AIV-F) according to DIN 18534
        ≥ 3.0
        approx. 5.2approx. 3.9approx. 3.8

    • 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.

        Current regulations and legal requirements must be taken into account and deviations from these must be agreed separately.

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

        Always set up a trial area/trial areas first.

    • 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

    Tools, accessories and PPE