Interior Insulation and Draught Proofing: Comfort Upgrade Guide
Cut heat loss and improve year-round comfort by combining insulation upgrades with targeted draught sealing. This guide focuses on the highest-impact steps for existing Aussie homes.
Difficulty
Intermediate
Estimated time
1 weekend to 1 week
Typical budget
AUD 500-6,000
Cut heat loss and improve year-round comfort by combining insulation upgrades with targeted draught sealing. This guide focuses on the highest-impact steps for existing Aussie homes.
Objectives
- Prioritise ceiling, wall, and gap-sealing actions by impact.
- Avoid condensation and moisture traps when adding insulation.
- Create a staged plan that suits older homes and mixed construction.
Materials & prep
- Bulk insulation batts (ceiling/wall as applicable)
- Weather seals for doors and windows
- Caulk, gap filler, and backing rod
- Downlight covers or compliant alternatives
- Vapour-permeable sealing tapes (where suitable)
- PPE: mask, gloves, eye protection
Step-by-step checklist
- 1 Inspect existing insulation depth, gaps, and compression areas.
- 2 Seal obvious air leaks at skirtings, penetrations, and architraves.
- 3 Address moisture sources before adding more insulation.
- 4 Upgrade ceiling insulation first for fastest comfort gains.
- 5 Retest rooms during hot and cool periods and adjust weak points.
Mistakes to avoid
- Blocking required ventilation paths in roof spaces.
- Installing insulation over unsafe light fittings.
- Assuming new insulation will fix uncontrolled air leaks by itself.
Compliance notes
- Follow manufacturer installation guidance and electrical safety clearances.
- Some upgrades intersect with NCC energy provisions in renovations.
- Use licensed electricians for any lighting or wiring changes.
References
FAQ
Should I insulate walls or ceiling first?
In most existing homes, ceiling insulation delivers the best first return, then air sealing and targeted wall work.
Can draught proofing cause mould?
It can if moisture sources and ventilation are ignored; fix damp issues and ensure controlled airflow.
How do I know if it worked?
Track room comfort and energy use across similar weather periods before and after upgrades.