Working at Height Working at heights is any height you work on which could potentially harm you if you fall. We can't put a measured distance to it even though Worksafe did classify 5 metres to fill up the particular hazardous work form.
As a working at heights trainer/rope access technician/ WAH PPE inspector, I conduct a refresher training every year for the building wash and roofing team of my company. The refresher consists of specific methods to keep themselves safe while working at heights. I noticed generic 2 days training for 15757 and 23229 do not equipped them with sufficient knowledge to be safe while working on the roofs.
What I added was practical training on pendulum effect, competency assessment on multiple equipment like rope grabs and lifelines, how to read an anchor info plate and determining safe load, basic knots (butterfly and stopper knots) rigging slings, choosing structural anchors etc.
The places the roofers work on change most of the time so having someone who is an expert on setting up lifelines, assessing existing anchors, new hazards and pendulum effects is vital. I don't believe anyone who has no experience on the job process should construct the safe work method statement or JSA for any high risk job.
Making the training program fun to learn is the best way to prevent harm and you will see a change in behaviour. And of course WAH kit that is comfortable fit for them because that's one of the reasons people avoid using them.