DOBAU®-2KS – reliable waterproofing for below-ground structural components according to DIN 18533
DOBAU®-2KS is a two-component, polymer-modified thick bitumen coating (PMBC) based on a bitumen emulsion in a pasty, thixotropic form. It is solvent-free, chemically activated by mixing both components and is used to create durable exterior waterproofing systems for structures in accordance with DIN 18533. DOBAU®-2KS meets the requirements of DIN EN 15814 (PMBC-W2A, CB2, C2A, R3).
Why DOBAU®-2KS?
- High application reliability thanks to the targeted chemical reaction of the two components
- Fast drying
- Seamless, flexible waterproofing with crack-bridging properties
- High heat resistance as well as high flexibility and elasticity even at low temperatures
- High ageing resistance
- Can also be applied well on damp substrates
- Solvent-free – environmentally friendly
Typical applications
- Waterproofing against ground moisture and non-pressing water on floor slabs and below-ground walls
- Waterproofing against moderate exposure to pressing water (e.g. backed-up water up to 3 m)
- Waterproofing against non-pressing water on earth-covered slabs
- Waterproofing against splash water at the wall base as well as capillary water in and under below-ground structural components
- Bonding of perimeter insulation boards (EPS/XPS) in below-ground areas
Application – for professional results
- Substrate: sound, even, free from cavities, ridges, open cracks and contamination.
- Fill depressions > 5 mm (e.g. mortar pockets, open joints, spalled areas) with suitable mortar.
- Level uneven areas and surface profiles if necessary (e.g. thin levelling plaster, sealing slurry or scratch coat).
- Note on the negative side: If water exposure from the negative side is expected during the construction phase, pre-treat the substrate with mineral sealing slurry (MDS).
- Primer: DOBAU® Primer E (solvent-free) is required for improved adhesion.
- Mixing: Briefly stir component A (emulsion) slowly, add component B and mix intensively for approx. 2–3 minutes until a homogeneous, lump-free compound is formed.
- Pot life: approx. 1 hour at around 20 °C.
- Application: like plaster, at least 2 coats (with or without reinforcing insert) using a trowel, spatula or float.
- Reinforcement insert: for W2.1-E and W3-E, embed a glass mesh reinforcement after the first application step (after sufficient intermediate drying).
- Coves: Form internal corners and wall/floor junctions as coves (possible with DOBAU®-2KS, max. radius 20 mm).
- Weather conditions: component surface and ambient temperature > 5 °C. Protect from rain and frost during application and drying.
- Cleaning: clean tools with water while fresh.
Consumption & layer thicknesses (guide values)
The values given are practical wet film thicknesses and may vary slightly depending on the substrate. The waterproofing is applied in 2 coats.
| W1.1-E |
Ground moisture / non-pressing water: minimum dry film thickness dmin 3 mm, wet film thickness approx. 4.0 mm |
| W1.2-E |
Minimum dry film thickness dmin 3 mm, wet film thickness approx. 4.0 mm |
| W4-E |
Splash water at the wall base / capillary water: minimum dry film thickness dmin 3 mm, wet film thickness approx. 4.0 mm |
| W2.1-E |
Moderate exposure to pressing water, backed-up water up to 3 m: 2 coats with glass mesh reinforcement, minimum dry film thickness dmin 4 mm, wet film thickness approx. 5.5 mm |
| W3-E |
Non-pressing water on earth-covered slabs: 2 coats with glass mesh reinforcement, minimum dry film thickness dmin 4 mm, wet film thickness approx. 5.5 mm |
Note: In accordance with DIN 18533, an additional layer thickness allowance (dz) of at least 25% of the minimum dry film thickness must also be included (increase the wet film thickness accordingly).
Protective layer / insulation layer
According to DIN 18533, structural waterproofing systems must be provided with an additional protective layer after sufficient drying. Suitable options include EPS/XPS rigid foam boards, dimpled membranes with slip layer or foam glass boards. Protective layers can be spot-bonded with PMBC (approx. 1–2 kg/m²). If perimeter insulation boards are used, they can, depending on flatness, be fully bonded with DOBAU®-2KS (guide consumption approx. 3–4 kg/m²).
Application control
According to DIN 18533-3, the wet film thickness must be checked regularly during application (at least 20 measurements per project or per 100 m²). The wet film thickness must be checked separately for each coat.
Packaging & storage
| Packaging |
15 l unit packs (consisting of emulsion and reactive component) |
| Storage |
at least 12 months in unopened packaging; store frost-free; avoid direct sunlight and strong heat |
| Cleaning agent |
fresh with water; cured material with DOBAU®-SWS bitumen cleaner or standard solvents/petrol |
Standards & certifications
- Waterproofing according to DIN 18533 (Part 1 and Part 3)
- Meets DIN EN 15814 (PMBC-W2A, CB2, C2A, R3)
- General building authority test certificate (abP) for use in transitions to concrete components with high water penetration resistance (PG ÜBB)
Data sheet & application
