There are growing calls for top-level action to tackle the "widespread" use of cheap imported building products in Victoria, as a probe continues into the installation of flammable cladding linked to last year's Docklands tower fire.

The aluminium construction material was found to have contributed to the spread of the blaze which moved quickly up the 23-storey Lacrosse Building last November. This week it was revealed that the Chinese-manufactured cladding, known as Alucobest, had been used in two other apartment projects by the same builder.

David Jager, a resident of Aura Apartments on Flinders Street. Credit:Paul Jeffers

The product was discovered at Aura on Flinders Apartments in Melbourne and Mitcham Village Apartments, after the Victorian Building Authority (VGA) used its performance audit powers to compel builder LU Simon to provide the information.

Earlier this month the building regulator sent out about 20,000 letters to architects, builders, surveyors and other industry professionals seeking their help to track down other properties where Alucobest has been installed.