BORNIT^® 1C Bitumen Thick Coating

status technical data sheet

25th June 2025

areas of application

BORNIT^® 1C (Thick Bitumen Coating) is used for permanent, flexible external waterproofing of building structures in the area in contact with the ground and is applied with a trowel or spraying equipment. The product is suitable for application on horizontal and vertical surfaces.
BORNIT^® 1C (Thick Bitumen Coating) can also be used for intermediate waterproofing (under screed) of floor slabs, balconies and terraces as well as for adhering rigid-foam insulating panels to bituminous and mineral substrates in the area in contact with the ground.
BORNIT^® 1C (Thick Bitumen Coating) adheres well to all dry and mineral substrates as well as bituminous substrates with sufficient stability (e.g. old cold and hot coatings or thick coatings).

type and properties

BORNIT^® 1C (Thick Bitumen Coating) is a single-component, polystyrene-filled and polymer-modified thick bitumen coating (PMBC) based on a bitumen emulsion. The product is solvent-free and environmentally friendly. Following thorough drying, a firm, yet still flexible and waterproof foundation coating results due to evaporation of the water content in the emulsion. The coating is flexible, crack-bridging and resistant to any aggressive substances occurring in natural soil. BORNIT^® 1C (Thick Bitumen Coating) is suitable for waterproofing according to the current DIN 18533 W1-E and W4-E.

advantages

surface

Step 1: The substrate must be free from ridges or sharp-edged unevennesses as well as soil.
Step 2: Unfilled or badly filled depressions like masonry joints, mortar pockets or surface defects larger than 5 mm must be repaired with suitable mortar. With fully and flushly grouted masonry, no plaster layer is required. Voids smaller than 5 mm as well as pores in the substrate can be closed by applying a thick layer of bitumen coating in a scraping manner. Especially for concrete surfaces, application in a scraping manner is likewise recommended in order to avoid the formation of bubbles.
Step 3: It must be observed that the substrate is firm, clean, free from dust and free from separating substances. The substrate should be dry and absorbent. The surface temperature must be at least 3 Kelvin above the dew point temperature of the ambient air.
Step 4: A pre-coat with BORNIT^® Basement Primer or BORNIT^® Unibit (1:2 diluted with water) must be applied onto the substrate. For solidification of sanding substrates, priming with BORNIT^® Solidificator SB3 (diluted with clean tap water in the mixing ratio 1:1) is recommended. Upon application of the thick bitumen coating in a scraping manner, the primer must be applied in advance. A scratch coat does not replace the primer. After drying of the primer, the substrate is prepared for application of the scratch coat or the thick coating, resp.
Important: During the construction phase, thick bitumen coatings can be damaged by water affecting their rear side. In principle, it must be ensured that the coating is not damaged by water affecting the adhesive side. If necessary, water-impermeable intermediate layers of mineral waterproofing slurry (e.g. BORNIT^® Slurry SF) must be applied, which cannot be detached from the substrate by water pressure.

processing

Upon processing BORNIT^® 1C (Thick Bitumen Coating), in principle, the current DIN 18533 must be observed. The processing of PMBC depends on the respective water impact class at the building object. Therefore, it must be observed that the water impact class present is clearly specified by the planner prior to the start of any work. BORNIT^® 1C (Thick Bitumen Coating) is delivered ready for use and applied to the substrate prepared as stated above with a notched trowel, smoothing trowel or suitable spraying equipment. BORNIT^® 1C (Thick Bitumen Coating) must not be applied in case of frost or impending rain. Application should be undertaken at object and ambient temperatures above +5 °C and not exceeding +30 °C. Application of the thick coating is undertaken according to the current DIN 18533 in two layers. In case of waterproofing against ground moisture and non-pressing water (DIN 18533 W1-E), the layers can be applied fresh on fresh. According to the current DIN 18533, hollow fillets must be formed using a mineral material (BORNIT^® Sealing Mortar) as an approx. bottle diameter-sized hollow fillet or with a 2-component thick coating (BORNIT^® Repabit, quick-drying) prior to the surface sealing. As a deviating, yet innovative and secure problem solution, here we recommend the use of BORNIT^® Triangle Tape (bitumen profile, fusible) as an alternative. Special attention must be paid to the proper execution of the waterproofing in the area of joints, connections and terminations as well as penetrations.

The fresh coating must be protected from rain and strong sunlight! The dried sealant must be protected from damage and UV radiation. Protection and drainage layers may only be applied after the sealant layer has completely dried (weather-dependent, from 3 to several days). BORNIT^® Fundamentdicht 1K can be used to bond insulation boards. Suitable protective layers include, for example, plastic pebble membranes with sliding film and filter fleece, as well as thermally or bitumen-bound drainage boards. Backfilling the excavation should be carried out promptly. In doing so, DIN 18533-1 Section 14 must be observed.

We recommend using BORNIT^® 2C Flex Bitumen Thick Coating or BORNIT^® Profi Hybrid 2C in conditions of high humidity, impending rain, or cool weather.

consumption

• water impact class W1-E and water impact class W4-E

approx. 4.3 l/m² = wet layer thickness 4,3 mm = dry layer thickness 3.0 mm

• insulating panel adhesion: approx. 2 l/m²

The provided consumption figures are practical experience-based values.
The consumption for the required scratch coat depends on the roughness of the substrate and must be calculated separately.
The thickness allowance according to DIN 18533-3 must be taken into account.

layer thickness control

According to the current DIN 18533 W1-E, a layer thickness check in the fresh state (wet layer thickness) at the execution object as well as an inspection of the thorough drying state at a reference sample located in the construction pit (e.g. brick) must be performed. water impact class W1-E and W4-E Minimum dry layer thickness: 3 mm

product type

single-component, polystyrene-filled and polymer-modified thick bitumen coating compound

base

bitumen emulsion

solvent

none

density at +20 °C

approx. 0.65-0.68 g/cm³

PH-value

11.0 - 11.5

consistency

paste-like, suitable for trowel application

colour(s)

black

application

smoothing trowel, spraying equipment

processing temperature (ambient and substrate)

not below +5 °C and not above +30 °C

thorough hardening time

3 to several days, depending on air humidity, temperature, layer thickness and substrate

cleaning

in the fresh state with water, in the hardened state with BORNIT^® MultiClean Spray, BORNIT^® MultiClean or BORNIT^® Bitumen Cleaner

storage

frost-free without fail!

shelf life

in originally sealed containers storable for 12 months

GISCODE

BBP10

GISCODE link comp. A

https://www.wingisonline.de/showbetrandoc.aspx?gisbaunr=4/00000018210/000009&docid=1995&lang=de

substances hazardous to health in terms of the ordinance on hazardous materials

none

hazard class according to ADR

none

boiling start and Boiling range

+100 °C

water impermeability

waterproof according to slit pressure test acc. to DIN 52123

possible layer thicknesses

up to 8 mm

Gefrierpunkt

ca. 0 °C

health and fire protection, occupational safety

To ensure safe handling of the product, the physical, safety, toxicological and ecological information provided online, the information in the current safety data sheet and the additional information on the label must be read and followed before purchasing or using the product! The applicable regulations, ordinances and laws must be complied with.

In case of doubt, please contact the BORNIT^® application technology department or the BORNIT^® service hotline on +49 375 2795 123.

storage

BORNIT^® 1C (Thick Bitumen Coating) must be protected from frost! Heat exposure above +30 °C and direct solar irradiation must be avoided. Shelf life in the originally sealed container 12 months.

disposal note

Only recycle completely empty containers. Material residues can be disposed of according to AVV-ASN: 080410 (adhesive and sealing compound residues, except for those falling under 080409).

note

The above information replaces all previous technical information about the product. Thus, this information is no longer valid. The details have been compiled according to the latest state of application technology. Please observe, however, that, depending on the state of the construction object, deviations from the method of application suggested in the datasheet may be required. Unless agreed otherwise in individual contracts, any information contained in the datasheet shall be non-binding and thus does not represent an agreed product constitution. We reserve the right to any changes in the information contained in this datasheet anytime.

GISCODE

BBP10

UN-number

No dangerous good in sense of these transport regulations.

Hazard-determining components for labelling

1,2-Benzisothiazol-3(2H)-on

EUH-records

EUH208: Contains 1,2-Benzisothiazol-3(2H)-on. May produce an allergic reaction.

recommended, personal protective equipment: