• MB FL 2K - Waterproofing adhesive and grout in one product©
  • MB FL 2K - Waterproofing adhesive and grout in one product©


MB FL 2K heralds in a new era of bonded waterproofing. This wonder product combines the properties of a mineral waterproofing slurry, flexible tile cement and water-tight grout. The 3 in 1 bonded waterproofing material can be used for a wide array of applications, but it’s in the restoration of old buildings that it really gets a chance to shine. MB FL 2K can be used on substrates such as old tiles without any problems. The waterproofing system is certified according to ETAG 022 and is approved for all water impact classes from W0-I to W3-I.

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3 in 1: waterproofing, bonding, grouting

MB FL 2K is the new, innovative solution for bonded waterproofing. It combines the properties of a mineral waterproofing slurry, flexible tile cement and water-tight grout in a single product. There are many advantages to using MB FL 2K.

Talent mustn’t be wasted!

Tested safety on every terrain

MB FL 2K can be used for a diverse range of applications in compliance with the relevant standards, whether renovating an old building or constructing a new one. The waterproofing system is certified according to ETAG 022 and is approved for all water impact classes from W0-I to W3-I. MB FL 2K can be used for long-lasting and reliable waterproofing not just in domestic bathrooms but also in commercial shower facilities and areas around swimming pools. Conventional bonded waterproofing materials under ceramic floor coverings traditionally represent a weak point. Although the wearing surface made from tiles or slabs is water-tight, water can still penetrate into the construction through the mineral grouting. Thanks to its special material composition, MB FL 2K offers significantly greater protection against penetrating moisture, making it an especially good choice for exterior areas such as balconies or terraces.

Waterproofing with a feel-good factor!


Bonded waterproofing: a rising star

The method of installing waterproofing as a composite structure with tiles and slabs has become increasingly popular in recent decades, and with good reason. First introduced in 1987, this method has established itself as a commonly used and highly durable waterproofing system that is backed up by real-life practice as well as regulatory frameworks. Bonded waterproofing has had the status of a standard-compliant waterproofing system since 2017, with the introduction of the DIN 18531–18535 series of standards.
Three sections of this standard deal with liquid-applied waterproofing materials in a bond with tiles and slabs (referred to as AIV-F for short). With a wearing surface made from tiles or slabs, bonded waterproofing can be used in compliance with the standards for waterproofing the following:

  • Balconies and walkways (DIN 18531 part 5)
  • Interiors (DIN 18534)
  • Tanks and pools (DIN 18535)

Compliant waterproofing, the easy way!

One product, 3 applications – waterproofing, adhesive and grout


The mineral waterproofing slurry guarantees reliable and straightforward application every time. Thanks to fast drying times, surfaces are ready for further work after just a few hours.

Tile cement

The main strengths of MB FL 2K are its exceptional flexibility and long open time, making it ideal for use on complex substrates such as old tiling.


As a water-impermeable grout, MB FL 2K is ideal for exterior use. Thanks to its light base colour, the grout can be tinted to give a variety of colour finishes.

Simple solutions for fast results

Balcony waterproofing layer structure

1. Sloped screed (e.g. with Betofix R4 EM)

2. Priming with Kiesol MB

3. Scratch coat of MB FL 2K

4. First waterproofing layer of MB FL 2K

5. Embed Tape VF

6. Second waterproofing layer of MB FL 2K

7. Adhesive bed of MB FL 2K

8. Tiling

9. Grout tiles with MB FL 2K

Note: The dry layer thickness must be at least 2 mm and must be applied in 2 coats.

Picture MB FL 2K Balcony Nonconform©
  • MB FL 2K

    Article No. 300120

    MB FL 2K

    3 in 1 composite waterproofing Combines the functions of waterproofing, tile cement and joint filler in one material

    3001 | MB FL 2K
    Size / Quantity

    Product specifications

    Base Polymer binder, cement, additives, special fillers
    Bulk density of fresh mortar Approx. 1.14 kg/dm³
    Consistency Paste-like
    Layer thickness 1.2 mm wet layer thickness yields approx. 1 mm dry layer thickness
    Water impermeability Approx. 1.5 bar

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

    Field of application

    • For use on floors indoors and outdoors
    • 3 in 1: waterproofing, tile cement and joint mortar
    • Interior and exterior, floor areas
    • Waterproofing in a bond under tiles (AIV-F) according to DIN 18534-3
    • Suitable for new and old buildings
    • Waterproofing balconies and covered walkways according to DIN 18531-5
    • Waterproofing bathrooms and transition areas in swimming pools


    • Highly flexible
    • Water impermeable
    • Reactive drying
    • A light colour shade enables pigmentable joint colours
    • Joint width of 6 - 12 mm
    • For heated floor coverings
    • Preparation
      • Substrate requirements

        The substrate must be clean, dry, flat and capable of bearing a load, and free of dust, oil, grease and release agents.

        Roughen non-mineral and pore-free substrates.

        Absorbent mineral substrates, not self-compacting concrete (SCC), may be slightly damp.

      • Preparations

        Remove projecting seams and mortar remains.

        Break off or chamfer corners and edges.

        Prime absorbent mineral substrates with Kiesol MB.

        Create a scratch coat using the product as a contact layer and in order to prevent blisters.

        If necessary, use suitable products to level out any sloping (e.g. Betofix R4 EM).


        Reinforce connection areas such as floor-to-ceiling doors and window elements, internal corners, floor-to-wall connections and transitions to balcony edge profiles with joint tape from the Tape VF series.

        In interior areas:

        Interiors: calcium sulfate screeds must be sanded then vacuumed.

        Residual moisture CA/CAF screed heated < 0.3 CM-%/ unheated <0.5 CM-%.

        Prime gypsum-based substrates (Primer Hydro F).

    • Application
      • Application temperature: min. 5 °C max. 25 °C
      • Working time 45 min
      • Waterproofing:

        Apply at least two coats of the product to the prepared substrate in accordance with the regulations.

        The total dry layer thickness must be ≥ 2 mm.

        Connection details/building element joints

        Reinforce internal corners and connection joints, as well as connections to non-mineral building components with joint tape from the Tape VF series.

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

        Laying the tiles:

        Existing waterproofing layers must be completely dry before further work is carried out.

        Apply the product as a thin-bed mortar using a suitable notched trowel, and lay the covering material in the fresh mortar bed before a skin forms.

        In outdoor areas or when laying large-format tiles and slabs, application using the buttering floating method is recommended.

        Immediately remove any soiling / mortar residue on the surface of the covering with water, keep the joint area free of mortar residue.

        Grouting tiles:

        The joints must be completely dry to avoid trapping moisture in the joint. Apply MB FL 2K grout to the joints with an epoxy grouting scraper in sections. If necessary, the consistency for use as a grout can be adjusted by adding max. 300 ml clean water (to 6.67 kg material). Wipe surfaces promptly with a sponge and wash clean with a sponge float and water. After complete drying, residues/adhesions can be cleaned with Remmers Clean FL.

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

        Do not use in direct sunlight.

        Do not use on untreated aluminium.

        The scratch layer does not as a rule count as a waterproofing layer.

        The maximum total wet coat thickness must not exceed 5 mm.

        Moving the material (e.g. by stirring) in the mixing bucket can prevent premature skin formation.

        Mortar that has already set cannot be made workable again by adding
        water or fresh mortar.

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

        Once dry, protect from mechanical damage.

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

        Ensure sufficient ventilation when applying the product in closed areas (wear respiratory protection if necessary).

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

        Any material that has already begun to dry can only be removed mechanically.

        Dry, adhering material can be cleaned with Remmers Clean FL.

    • Storage / shelf life
      • Store frost-free and cool / protect for moisture / close containers
      • Shelf-life 9 months
      • If stored unopened in its original container in a cool, dry place and protected against frost, the product will keep for at least 9 months.

    • Usage
      • 1.3 kg / mm thick layer / m²
      • As waterproofing:
        Min. 1.3 kg/m²/mm dry layer thickness

        As tile cement:
        8 mm tooth: approx. 2.9 kg/m²
        10 mm tooth: approx. 3.5 kg/m²
        12 mm tooth: approx. 4.4 kg/m²

        As joint filler:
        Approx. 0.2 kg/m² (6 mm joint width, tile 30/60 cm, 6 mm thick, total joint length 410 cm)

    • General information
      • 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.

        Certificates of suitability (EAD) must be observed during planning and execution.

        Special agreements and certificates of suitability can be downloaded online at www.remmers.com.

        Always set up a trial area/trial areas first.

        Peel tests are neither suitable nor authorised for assessing the suitability of the product for use.

        Joints in exterior areas: To prevent possible green growth on surfaces grouted with MB FL 2K, it is recommended to add Remmers Protect MKT 1.

    • 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.