The Commerce Commission has formally warned Consolidated Alloys NZ for cartel-like behaviour after the Australian-owned manufacturer used a settlement over a patent dispute to try and restrict roofing products available in New Zealand.

In June 2013 the Auckland-based manufacturer negotiated a settlement with competitor Edging Systems (NZ) resolving a commercial dispute about whether Edging System’s EZ-Edge product breached the Consolidated Alloys’ registered patent over soft-edge flashing products used on homes with metal roofs, the competition watchdog said in a statement. As part of…