Drossbach Ducting

Drossbach Duct is manufactured in Christchurch supplying the South Island while our Auckland branch is able to supply to our North Island customers.

Drossbach Duct is used as a duct former for a variety of precast and cast – insitu concrete work including:

  • Precast connectors
  • Service penetrations
  • Formers for starter bars
  • Post-tensioning ducts

The semi-rigid metal duct is strong and durable for casting into concrete and is easily tied into position adjacent to reinforcing steel. Standard grout injection tubes, grout vents or blanked ends can be supplied on request.

Key features of Drossbach

  • Duct sizes from 33mm to 130mm ID as standard.
  • Fabricated from 0.30mm thick galvanised strip steel
  • Cutting service provided (charges applicable).
  • Grout and vent tubes, blanked end - available on request (charges applicable).

Contact your local BBR Contech office to discuss your specific requirements or email

chc@contech.co.nz for any orders.

BBR Contech stays at the forefront of technology and maintains a high level of industry participation by membership and affiliations with the following organisations: