Our business

The Building Products Division unites our manufacturing businesses, supplying building materials to a broad range of industries across New Zealand and Australia.

The Building Products Division employs over 3,900 people across more than 150 manufacturing sites in New Zealand and Australia, and creates products used to build homes, buildings and infrastructure – including cement, insulation, plasterboard, and plastic and concrete piping.  

Its businesses include Winstone Wallboards, Iplex, Firth, Humes, GBC Winstone, Rocla, and Tasman Insulation. 

Our business building products GBC Winstone ship
Our business building products Rocla pipe manufacturing

Our Building Products businesses


Building Products logo - Altus

Altus is a joint venture that develops and manufactures premium aluminium extrusions for an extensive range of industries; whether it is windows and doors, commercial systems or specialist aluminium extrusion for private supply.

View website

Building Products - ACP
Australian Construction Products

Australian Construction Products (ACP) is one of Australasia's leading manufacturers and distributors of steel and civil roading.

View website

Building Products logo - CSP Pacific
CSP Pacific

CSP Pacific supply and hire road systems and safety products. Their products include permanent and temporary road safety barriers, lighting and utility columns, poles, and corrugated metal structures.

View website

Building Products logo - Firth

Firth is New Zealand's leading national concrete company and only national masonry supplier. Firth’s products are used across all building sectors and environments.

View website

Building Products - Fletcher Insulation
Fletcher Insulation

Fletcher Insulation is Australia’s leading insulation company, with manufacturing facilities in Melbourne and Sydney. The company’s brands include Pink Batts® insulation, Sisalation® foil and Permastop® building blanket.

View website

Building Products logo - GBC Winstone
GBC Winstone

GBC Winstone is New Zealand's largest manufacturer and supplier of aggregates, cement, and sand and proud providers of Golden Bay Cement and Winstone Aggregates products as well as the Winstone Transport brand.

View website

Building Products - Humes

Founded in 1923, Humes is one of the largest and longest serving infrastructure suppliers in New Zealand with 26 sales centres and seven manufacturing operations across the country. Along with manufacturing a range of premium pre-cast and concrete pipes, they are also experts in providing innovative technology and products to suit New Zealand’s different infrastructure needs. This includes roading, streetware, drinking water, stormwater, and wastewater management.

View website

Building Products - Iplex Pipelines Australia
Iplex Pipelines Australia

Iplex Pipelines manufactures and supplies a comprehensive range of pipe, fittings, and valves in PVC, Polyethylene, Ductile Iron, PE-X, PB, and GRP systems. Products are used to convey potable water, stormwater, gravity, and pressure sewerage, trenchless pipeline rehabilitations, chemical and slurry, irrigation and coal-seam gas; servicing the civil, plumbing irrigation, gas and infrastructure, trenchless, mining, and electrical markets. Iplex supports these markets through extensive technical and innovation capability ensuring customers are kept at the forefront of worldwide developments.

View website

Building Products - Iplex Pipelines NZ
Iplex Pipelines New Zealand

Iplex Pipelines is a leading manufacturer and supplier of plastic pipeline systems in New Zealand. Iplex Pipelines provides products and systems to the water infrastructure, irrigation, civil, telecommunications, electrical, and construction sectors.

View website

Building Products - Rocla

Rocla is a leading Australian supplier of concrete solutions to the building and construction industry, with manufacturing and sales across Australia. Rocla can supply standard products, as well as value-added solutions to meet specific customer needs.

View website

Building Products - Sims Pacific Metals
Sims Pacific Metals

Sims Pacific Metals supplies Pacific Steel with scrap metal which is converted to rebar and wire for sale on the domestic and overseas markets. (Joint Venture)

View website

Building Products - Tasman Insulation
Tasman Insulation New Zealand

Tasman Insulation New Zealand's business is insulation, whether it is for residential homes, commercial buildings, or industrial complexes. Their best-known brands include Pink® Batts® insulation, PinkFit® installers and Sisalation® building foils and underlays.

View website

Building Products - Winstone Wallboards
Winstone Wallboards

Winstone Wallboards is New Zealand's only manufacturer and largest marketer of gypsum plasterboard, drywall systems, and associated products and services. The company has been operating since 1927 and manufactures plasterboard systems under the GIB® brand.

View website