Sopro FDF Tanking Membrane

Sopro FDF Tanking Membrane is a Highly elastic, ready-to-use, one-component liquid waterproof coating for water-proofing indoor spaces to DIN 18 534 Part 3. Liquid admixture for tinting Sopro FDF flexible sealing compound to provide contrast colour for application of second membrane coat. To help distinguish between and keep a check on different membrane coats.

Used in moisture-exposed spaces not subject to hydrostatic pressure, e.g. bathrooms, showers, washrooms, and sanitary facilities. Suitable for Moisture Exposure Classes A (walls) to Construction Products List A issued by DIBt (German Institute for Construction Technology) and A0 to ZDB (Federation of the German Construction Industry) datasheet.

Liquid waterproof membrane for waterproofing indoor spaces to DIN 18 534, suitable for W0-I “Low water action” and W1-I “Moderate water action” applications (floor/wall), and W2-I “High water action” applications (wall). Suitable for installation of waterproof membranes below ceramic tile and natural stone coverings in showers, bathrooms, sanitary facilities etc. Sopro DSF 523 one-component flexible sealing slurry, Sopro DSF 623 flexible RS sealing slurry, Sopro DSF 423 two-component flexible sealing slurry or Sopro TDS 823 two-component turbo sealing slurry shall be used for permanently underwater applications, e.g. in swimming pools. Sopro PU-FD surface sealant shall be used for applications involving exposure to chemically aggressive waters or media.

Related Downloads

icon-pdf TDS Sopro FDF Tanking Membrane

icon-pdf EPD_Sopro FDF Tanking Membrane


icon-pdf SMET Professional Tiling Systems Brochure


Featured Benefits of Sopro FDF Tanking Membrane

  • For indoor walls and floors
  • waterproof membrane for incorporation below tile finish
  • Available in contrast colours (grey and light grey)
  • Contrast agent for tinting liquid waterproof coating also available in a convenient syringe
  • Sopro FDF-KM 027 contrast agent easy to stir in without equipment
  • Suitable for floor heating systems
  • Crack-bridging
  • For brush, roller, trowel and spray application
  • Solvent-free
  • EMICODE system of GEV (German Association for the Control of Emissions in Products for Flooring Installation, Adhesives and Building Materials): EC1PLUS (“very-low-emission-plus”) rating
  • DGNB (German Sustainable Building Council): Top quality level 4, Line 9, based on DGNB (German Sustainable

Technical Details for Sopro FDF Tanking Membrane

Coat Thickness See datasheet.

In compliance with good practice, liquid waterproof membranes shall be applied in at least two
coats using contrast colours.
Stated consumption rates are minimum values. Separate, good-practice evening out of substrate,
e.g. through application of a skim coat, is a prerequisite. Under DIN standards, an extra coat thickness
of 25 % is required for wet coat thickness.
FDF-KM 027: 1 ml contrast agent per 1 kg FDF 525/527

Drying Time Surface-dry after the first coat: 1.5 – 2.5 hours Surface-dry time after second coat: 3.0 – 5.0 hours
Suitable Substrates Cement, lime/cement and eminently hydraulic lime renders, masonry cement, gypsum plasterwork,
gypsum plasterboard and gypsum fibreboard drywall panels, concrete, lightweight concrete,
aerated concrete, flush-jointed masonry, grade V 100 GE 1 particleboard to DIN 68763,
cement, mastic asphalt, magnesium oxychloride (magnesite) and calcium sulphate (anhydrite)
screeds, existing ceramic coverings. Composite extruded polystyrene units; existing, firmly bonded
adhesive residue from PVC flooring or carpeting. Where used in conjunction with timber
substrates, please contact our Technical Service team.
Packaging FDF 525: 20 kg bucket, 15 kg bucket, 5 kg bucket, 3 kg bucket
FDF 527: 20 kg bucket, 15 kg bucket, 5 kg bucket, 3 kg bucket
FDF-KM 027: Box (6 x 10 ml syringes)
Specified times Apply for normal temperature range of +23°C and 50% relative humidity; higher temperatures shorten and lower temperatures lengthen these times.
Application Temperature Between +5 °C and +35 °C
Coverage see datasheet
Shelf Life FDF 525/527: Approx. 24 months in original unopened containers, protected from frost
FDF-KM 027: Approx. 12 months in original unopened containers, protected from frost
Tools and equipment Lambswool roller, foam roller, sawtooth trowel, finishing trowel, stirrer; wash tools with water immediately
after use.


FDF 525: 20 kg bucket, 15 kg bucket, 5 kg bucket, 3 kg bucket
FDF 527: 20 kg bucket, 15 kg bucket, 5 kg bucket, 3 kg bucket
FDF-KM 027: Box (6 x 10 ml syringes)