NS Constructions NT Pty Ltd — Insulation in Woodroffe

Ceiling insulation installation costs $1,000–$2,500 for a standard 3-bedroom home (approx 120m²). Glasswool batts are most common at $8–$15/m² installed. Blown-in loose-fill insulation costs $10–$18/m². Wall insulation during renovation costs $25–$50/m². The total depends on existing insulation, ceiling height, and access.

The NCC mandates minimum R-values based on climate zone. In southern Victoria and Tasmania (Zone 7/8): R5.0+ ceiling, R2.0+ wall. In temperate NSW/ACT/SA (Zone 6): R3.5+ ceiling, R1.5+ wall. In subtropical QLD (Zone 2): R3.7+ ceiling. Always install to the NCC minimum for your zone — higher R-values provide better returns on energy bills.

Common types: glasswool batts (Bradford, Fletcher Insulation — most popular), polyester batts (no itch, good for DIY), rockwool (fire-resistant, good for party walls), reflective foil (works by reflecting radiant heat, best in hot climates, often used under roofs), and blown-in insulation (cellulose or glasswool, for retrofitting without removing ceiling lining).

Ceiling insulation (roof space access required) can be DIY-installed with proper safety precautions: N95 mask, safety glasses, long sleeves, gloves. Ensure ceiling space is not contaminated with asbestos before entering. Do NOT install near recessed downlights (fire hazard) unless IC-rated or properly shielded. Wall insulation typically requires professional installation.

Underfloor insulation reduces heat loss through timber floors by 10–20%, providing comfort in cooler months. It's most cost-effective in cool temperate regions (VIC, TAS, ACT, southern NSW) where floors are a major source of winter heat loss. Cost is $15–$35/m² installed. Homes on concrete slabs don't benefit from underfloor insulation.