New Zealand’s Department of Building and Housing is to undertake an investigation into allegations that under-strength timber has been used in truss and timber frame manufacturing.

Building and construction minister Maurice Williamson announced the investigation after allegations arose of the use of under-strength timber in some new buildings built in the Auckland region during the past 18 months. Department officials are now working with industry representatives and local government officials to determine the nature and extent of the problem.

“Any issue involving the misuse of building materials is obviously cause for some concern,” said Mr Williamson. “Active steps are being taken to identify where problems may exist.”

Mr Williamson added “only a small number of frame and truss manufacturers are thought to be involved”, but the Certified Builders Association of New Zealand (CBANZ) said the supply chain was an integral part of making homes fit for purpose.

“Builders have an obligation to provide products that are fit for purpose to the people they build homes for,” said CBANZ chief executive Derek Baxter. “Obviously we look to our supply chain to provide that.

“Our members are pleased with the rapid action by [Mr] Williamson and by our suppliers to provide advice and assistance to builders, customers and councils should they have concerns over the issue,” he said.