Waterproofing Materials


BORNIT® 1C (Thick Bitumencoating)

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quick facts

BORNIT® 1C (Thick Bitumencoating)fundamentdicht 1k 32liter 225px
bituminous thick coat compliant with DIN 18195 (2000-08), polystyrene filled, highly polymer-modified, excellent crack bridging, solvent-free, for application without waterproof plaster, stable up to 7 mm layer thickness, for sealing buildings, with general building authority test certificate, for vertical and horizontal surfaces, applicable indoors and outdoors, and suitable for the adhesion of insulation boards. Prime with BORNIT® Basement Primer.
protect against frost!
Color: black

4 017228 004075
4 017228 004082
12 liters
32 liters
44 pails
18 buckets
approx. 4.3 liter/m² depending on water impact class
insulation board adhesion: approx.2 liter/m²
tests / CE declaration of performance

detailed information

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 paste-like and stable consistency of the material enables application of high layer thicknesses in one go. 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.

your benefits
• Particularly easy trowel application due to low material weight
• Sprayable with suitable equipment
• Highly flexible due to high-quality polystyrene and polymer modification
• Immediately ready for processing without mixing
• Waterproof and crack-bridging after thorough drying
• With fully and flushly grouted masonry, no plaster layer required
• No seams as with films or sealing sheets
• Adheres insulating panels to concrete, masonry and thoroughly dried thick coatings
• Solvent-free, hence environmentally friendly

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.

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.

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. In order to achieve an accelerated drying process, BORNIT® Accelerator for 1C can be admixed to the thick coating in portions and under continuous stirring. 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 solar irradiation!
The waterproofing layer must be protected against damages. Protective and drainage layers, however, must only be applied after complete and thorough drying of the waterproofing layer (depending on the weather, 3 to several days). BORNIT® 1C (Thick Bitumen Coating) can be used to adhere insulating panels. Suitable protective layers are, e.g., dimpled plastic sheeting with sliding film and filter fleece as well as thermally or bituminously bound seepage panels. Subsequently, the construction pit can be filled. In that, DIN 18533-1, Point 14 must be observed.

Layer thickness check
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 thoroughly dried state at a reference sample located in the construction pit (e.g., a brick) must be performed.

Water impact classes W1-E and W4-E:    Minimum dry layer thickness: 3 mm

• 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 consumption figures stated are practice-based empirical values. The layer thickness allowance according to DIN 18533-3 must be considered.

Product data in brief
Art Single-component, polystyrene-filled and polymer-modified thick bitumen coating compound
Base Bitumen emulsion
solvent None
Color Black
Density Approx 0.65 - 0.68 g/cm³
Consistency Paste-like, suitable for trowel application
Application Smoothing trowel, spraying equipment
Water impermeability Waterproof according to slit pressure test according to DIN 52123
Thorough hardening time 3 to several days, depending on air humidity, temperature, layer thickness and substrate
Processing temperature (ambient and substrate) Not below +5 °C and not above +30 °C
Storage Frost-free without fail!
Shelf life In originally sealed containers 12 months
Possible layer thicknesses up to 8 mm
Cleaning In the fresh state with water, in the hardened state with BORNIT® Bitumen Cleaner or BORNIT® MultiClean
Substances hazardous to health in terms of the ordinance on hazardous materials None
Hazard class acc. to VbF and ADR None
GISBAU product code BBP 10

System products
BORNIT® Basic Primer  
BORNIT® Triangle Tape
BORNIT® EasyPipe
BORNIT® Basement Primer
BORNIT® Sealing Mortar
BORNIT® Accelerator for 1C
BORNIT® Unibit
BORNIT® Solidificator SB3

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.

Health and fire protection, occupational safety
For information on handling, safety and ecology, please refer to the current safety datasheet.

Forms of delivery
12 l    hobbock    ………………………………………    44 pcs. per pallet
32 l    hobbock    ………………………………………    18 pcs. per pallet

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).

CE marking
1023 / 0432
BORNIT-Werk Aschenborn GmbH
Reichenbacher Straße 117
08056 Zwickau / Germany
EN 15814:2011+A2:2014
Polymer-modified thick bitumen coating
for waterproofing building components in contact with the ground
PMB - CB2-W2A-C1
Watertightness W2A
Crack-bridging capability CB2
Resistance to water Passed
Flexibility at low temperatures Passed
Dimensional accuracy at high temperatures Passed
Fire behaviour Class E
Compressive strength C1
Durability of watertightness and fire behaviour Passed

This datasheet replaces any 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 condition. We reserve the right to any changes in the information contained in this datasheet anytime.


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Stock Note
lösemittelfrei 2020 ani2


Necessary information – particularly for the use and the use of our products – please refer our brochures. We are at your personal disposal.