The insulation requirements vary between different building sizes and locations. However, the following are the proved ways of insulating to have a 7 star rating house:
- Install a low-cost 60mm roof blanket (R1.3), which sits in between 20mm timber battens. This gives you 0.2-0.5 NatHERS star rating.
- Insulate the studs to the fullest, which is to use a 32 kg/m3 insulation with an R-value of R2.7
- If you are using metal studs or purlins, use thermal breaks to reduce thermal bridging
- Use a reflective foil-faced insulations where there is an air space available above or near the installed insulation
- Insulate concrete slabs using EPS or XPS boards, especially in colder locations.