The building envelope is the construction elements that separates the internal and external environments, to maintain a level of thermal comfort for the occupants. Construction practices have the potential to impact upon the effectiveness of the building envelope in achieving and maintaining a thermally efficient building envelope. The building envelope is the combination of your home’s exterior walls, ceiling, floor, doors and windows. Insulation plays an important role in providing a thermally efficient building envelope.

ICANZ Bradford Ceiling Insulation
ICANZ Fletcher Insulation Installing Wall Pink Batts Roof

Ceiling insulation

Select the highest R value appropriate for your climate to avoid heat loss in winter in cooler climates and heat entry in summer months. Avoid compressing batts and cover the entire ceiling area, whilst adhering to any clearance requirements about ceiling mounted downlights that are not IC rated, or exhaust outlets. To avoid heat loss consider installing IC rated downlights.

ICANZ Bradford Wall Insulation

Wall insulation

Install insulation to avoid any compression of the batt, services pipes and wirings layed in walls are checked in to the batts, all areas of the external wall surface, including junctions and corners are insulated and choose the batt’s thickness relevant to the construction type. Select and install a pliable building membrane that achieves and maintains good air-tightness around the walls, doors, windows and service outlet points.

Underfloor insulation

Select a batt that provides good insulation for your climate and avoid compressing the batts.

Roof insulation

Select a product appropriate to your climate and site issues and install the product in accordance with the manufacturers instructions. Where the roof is pitched and has an eave sheet then use edge batts that are thinner than ceiling batts to ensure you receive good insulation coverage.

ICANZ Duct Insulation


Insulating HVAC ducting will assist in delivering the intended heating and cooling load throughout the building and reduce energy lost into the roof space and the interstitial space between commercial floors. Insulation of ducts will also help to achieve the NCC energy efficiency targets, whilst delivering thermal and acoustic comfort to building occupants.


ICANZ Summer Gains and Winter Losses

Energy Smart Housing Manual by Sustainability Victoria shows the impact of heat loss and heat entry of uninsulated homes.

Source: https://assets.sustainability.vic.gov.au/susvic/Guide-Energy-Smart-Housing-Manual.pdf pg 50


ICANZ Winter Losses
ICANZ Summer Gains

Energy Smart Housing Manual by Sustainability Victoria shows the impact of heat loss and heat entry of uninsulated homes.

susvic/Guide-Energy-Smart-Housing-Manual.pdf pg 50


ICANZ Submission to the National Energy Performance Strategy (NEPS)

This submission demonstrates the urgent need for a national energy performance strategy and details data from international and Australian programs and research.

ICANZ Aiic Improving the Health Efficiency

Improving the health and efficiency of buildings with insulation

Improving the thermal performance of buildings – particularly through upgrades such as insulation – will play a key role in improving Australia’s energy performance and saving money for businesses and consumers.