Traditional insulation materials like fibreglass, foam, and cellulose primarily reduce convective heat transfer by trapping air or gas within their structure. However, they are far less effective in minimizing radiant heat transfer, which is a dominant mode of heat transmission in buildings—especially in Australia’s warmer climates. In fact, these standard materials tend to be strong radiators of heat rather than effective barriers against it.
Reflective insulation, on the other hand, addresses radiant heat transfer using layers of aluminium and plastic. While it does trap air to reduce convective heat loss, the primary benefit comes from its highly reflective foil surfaces, which can reduce heat transfer by up to 97%. This significant reduction occurs because the foil inhibits radiative heat transmission, turning adjacent air cavities into radiant insulation zones.
In practice, integrating a reflective material into a building system drastically improves the total R-value.
Ultimately, reflective insulation surpasses traditional materials in reducing radiant heat. The term “reflective” insulation can be slightly misleading, as aluminium either reflects heat (97% reflectivity) or minimizes heat radiation (3% emissivity). Regardless of terminology, both mechanisms significantly reduce heat transfer, making reflective insulation an essential tool for optimizing thermal efficiency in buildings.
When installed within building cavities, reflective insulation also traps air, reducing convective heat flow—effectively addressing all three modes of heat transfer. This comprehensive approach is why reflective insulation provides superior thermal performance compared to conventional insulating materials.
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