If you have had "r" rated batts or bulk fibrous material put in your walls or roof at home and wonder why it is no cooler or even hotter, especially in the evenings, be advised that the sun (our principle source of heating in Australia) is radiant heat.
It is currently unknown the effect of radiation on bulk (fibrous) insulation materials. Many believe that fibrous insulations have little effect on radiant heat, simply, it traps the thermal heat within the building.
The performance of foil is well documented as a barrier to radiant heat transfer. Most concede that foil reflects 97% of radiant heat provided that it faces air space and the heat source. There is an urgent need for radiation testing of all insulation materials given the considerable energy waste operating air conditioners and the unnecessary discomfort of people in the home.
Appropiate use of aluminium foil insulation, combined with good ventilation and shading of windows and walls can significantly reduce the need for air-conditioning in most climates of Australia. The main cause of thermal discomfort in summer is solar radiation, not air temperature. When you walk into the shade of a tree, the air temperature remains the same but radiation is greatly reduced and you therefore feel cooler.
In order to provide a wider range of R-Values and applications, foil insulation manufacturers in recent years have developed a number of clever and innovative products. These designs will allow multi-layered foil products, folded segmented foils, continuous roll foils and foil/bulk laminated products to be installed relatively inexpensively. These products can be used in either the roofline, ceilings, walls or floors.
Aluminium Foil Insulation Association
In recent years there has been a resurgence of interest in aluminium foil insulation systems, led by the Aluminium Foil Insulation Association. AFIA was formed in Febuary 1999 and has established new high standards to govern the conduct of its members in the market place.
As a result of a need for industry change, AFIA has instigated a major research project into the effects of radiation and confection in roof spaces on both foil and bulk forms of insulations. This project is proposed to be co-sponsored by the Australian Greenhouse Office, and the Queensland Government, and will be undertaken by AITA and CSIRO, and will utilise 60 existing defence homes in Townsville. Designers need also to be aware that a new thermal insulation standard covering all insulation products is shortly to be released. Also, a major revision of AS2627.1-1993 is imminent.
For any building, in any climate, please feel free to contact us to discuss how we can provide a complete insulation solution for you.
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