BORNIT^® Dachbit

status technical data sheet

16th July 2026

Areas of application

BORNIT^® Dachbit is used as a topcoat in maintaining bituminous and mineral roofing membranes. Not suitable for corrugated bituminous sheets. The roofs must have a pitch of at least 3%, in order to exclude permanently standing water. In order to improve adhesion, and on absorbent substrates, use BORNIT^® Grundbit as a primer.

Type and properties

BORNIT^®-Dachbit is a water-based, polymer-modified protective coating based on a bitumen emulsion. It is free from organic solvents (solvent-free) and is used as an alternative to solvent-based bitumen coatings. The product is applied cold and can be brushed, rolled or sprayed using an airless spray system.

BORNIT^®-Dachbit meets the requirements (Annex 313 / Items 10.1 and 10.2 – Bitumen-based building products) of the state quality label for sustainable buildings (Quality Label for Sustainable Buildings (QNG)). The label is issued by the German Federal Ministry for Housing, Urban Development and Construction.

Advantages

Surface

The substrate must be firm, clean and free from separating substances (oils, greases, etc.). It may be slightly moist, but not wet. In case of highly weathered and chalking or absorbent, mineral substrates, prime with BORNIT^® Grundbit.

Processing

BORNIT^® Dachbit is manufactured ready for processing. Topcoats must be applied undiluted. In that, at least two coats are recommended. The second coat is applied following sufficient initial drying of the first one. Application is undertaken with a coating broom, small or large brush, roller or airless spraying equipment. The processing equipment must be pre-wetted! Clean the respective processing equipment with water immediately after use. Hardened material can be removed with BORNIT^® Bitumen Cleaner.
BORNIT^® Dachbit must only be applied in dry weather and under no circumstances in case of frost or rain or impending rain, resp.

Consumption

approx. 0.4 l/m² per coat (at least 2 coats)

Product type

latex-modified bitumen emulsion

Base

bitumen emulsion, latex

Solvent

water

Density at +20 °C

1.00 g/cm³

PH-value

11,0 - 11,5

Consistency

viscous

Film-forming components

approx. 60 %

colour(s)

black (brown in the fresh state)

Dilution

water

Application

small or large brush, roller, spraying equipment

Processing temperature (ambient and substrate)

not below +5 °C and not above +30 °C

Cleaning

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

storage

at moderate temperatures, not below +2 °C up to +30 °C sensitive to frost!

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

Health and fire protection, occupational safety

Caution - Only use in well-ventilated outdoor areas. Not suitable for use in closed rooms or poorly ventilated pits!
Do not eat, drink or smoke while working, keep away from sources of ignition.

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

In originally sealed containers storable for 12 months. Protect from frost!

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 information set out above supersedes all previous technical information relating to the product. The previous information is therefore no longer valid. The details have been compiled in accordance with the latest state of the art in application technology. Please note, however, that depending on the condition of the building, it may be necessary to deviate from the working method recommended in this data sheet. Unless otherwise agreed in an individual contract, all information contained in this data sheet is non-binding and therefore does not constitute an agreed product specification. We reserve the right to make changes to the information contained in this data sheet at any time.

The product illustrations are to be understood as examples. No legally binding claim can be derived from them. We reserve the right to make changes to the product’s appearance.

Our packaging complies with the relevant legal requirements and with Regulation (EU) 2025/40 on packaging and packaging waste (PPWR). The technical documentation in accordance with Annex VII is available and can be provided on request by email to info@bornit.de.

GISCODE

BBP10

UN-number

Kein Gefahrgut im Sinne der Transportvorschriften.

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: