I was watching current affairs last year and there was a family who had their new home built by a major Melbourne based builder. Problem was the builder did not install any ceiling battens and their ceiling fell down. 

Lucky for the family, they were out at the time and no one was killed. They approached the builder and because there was 7 year warranty period was up, the builder refused to do anything about it. 

The builder then went on to blame the failure on a lack of roof maintenance by the owner. In all my years in the construction industry I have not come across any maintenance for a roof other than to clean the guttering out. 

It is clear to me that the building company was making excuses due to their poor construction methods, with not providing ceiling battens for the plaster to be fixed to.

Plasterboard is a product that should be fixed to battens if used in a ceiling application due to its inability to cope the movement. A truss roof is designed to be under load and to flex so a break needs to be installed between the two substrates thus the use of battens. The install of battens in a 18 square home is around $1000, not much if you think about it. 

The builder needs to wake up before somebody is injured or killed by their poor construction methods.