What is the minimum amount of insulation I should put in the ceiling?
The minimum amount that should be put in should follow the Building Code of Australia’s guidelines for each of the 8 climate zones. Mostly it is a minimum of R4.1
Even if you don’t currently have the budget for a full home installation, you can still benefit significantly from ceiling-only insulation.
If your home has no easily accessible attic space (i.e. cathedral ceilings), you can still insulate it with polystyrene boards.
Since 25-35% of your home’s heat escapes through an uninsulated ceiling, ceiling insulation is essential to keep your home comfortable and your energy bills low.