Waterproofing compound

Product description

Fescon Waterproofing Compound is a water-soluble, one-component, fibre-reinforced waterproofing coating based on synthetic rubber latex. Certificate No. VTT-C-870-06.


  • Easy to apply
  • Sufficient dry film thickness easily with just two applications
  • Jelly-like consistency


  • Waterproofing of floors and walls in indoor areas when the surface will be ceramic tiles
  • Not suitable for outdoor use or in areas under constant water load, such as pools
  • Must not freeze even when dry, for example outdoor saunas
The product is listed in the portal for building products that can be used in Nordic Swan Ecolabelled buildings.

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EAN code Product name Product number Package size
6416841259097 Waterproofing compound 3L 25909 3 l
6416841259035 Waterproofing compound 12L 25935 12 l


Pretreatment of the base
  • The base must be dry, dust-free and level, solid and immobile
  • Remove any cement paste and weak or eroded surface
  • Level uneven floors with Fescon Floor Levelling Compound and walls with Fescon Levelling Compound for Wet Areas WTT
  • Treat the bases with Fescon Adhesive Primer according to the instructions
  • Switch underfloor heating off two days before waterproofing
  • If necessary, mix the insulation before use.
Spreading the waterproofing compound

The temperature of the room and the base must be between + 10 and + 30 °C. The moisture content of the concrete base must be below 90% RH. The working conditions must remain constant throughout the entire work.

Spread the waterproofing compound first into corners, joints, lead-throughs and around the floor drain. Fasten a reinforcement strip in these locations using a brush or a roller. Make sure that the strip is wet throughout. Place a 2 x 30 x 30 cm fibre membrane around the floor drain, or drain flange flexible KL-B 370x370 mm (installed on set adhesion promoter). Do not apply waterproofing compound inside the floor drain.

Next, apply the waterproofing compound to the entire area to be treated. Allow to dry for four to eight hours. After drying, the waterproofing compound is grey in colour. Apply a second layer of the waterproofing compound. Allow to dry for twelve hours before beginning to lay tiles. Cut a hole at the floor drain with a diameter 40 mm smaller than the drain diameter, fold and clamp the membrane to the inner surface of the drain using a clamp ring. Wash tools and equipment with water immediately after completing thee work.

Waste handling

Storage and handling of waste. See the separate storage and disposal instructions https://www.fescon.fi/en/material-bank

Technical information

Material usage

walls: approx. 0.7 l/m2
floors: approx. 1.0 l/m2

Package size 3 l and 12 l

18 months in a warm location


1 l = 1.3 kg

Lowest usage temperature

+ 10°C

Drying time

1-8 h/1st treatment. Approx. 12 h after the second treatment before tile laying (colour change)

Film thickness 0.4 mm/wall, 0.6 mm/floor
Method of application brush or roller
Transport Warm transport

The information is based on tests and practical experience. We cannot affect conditions at the work site so we cannot assume responsibility for the end result affected by local conditions.


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