Properties and characteristics of the main natural and ecological insulation.
This page is part of the file on natural insulation.
4) Perlite or vermiculite
Unknown, perlite is an ecological insulator made from crushed volcanic rocks and expanded thermally to more than 1000 ° C: by evaporating the water inflates the fine particles of rock that store air.
Perlite is completely inert, non-flammable, rot-proof, insensitive to insects and rodents and totally free from toxicity.
In the form of ridged panels or bulk, it is used mainly for the isolation of attics and roofs.
It is the only insulator for lost attics which can be considered to have unalterable properties over time.
- Thermal conductivity: 0,045 0,05 to W / m ° C.
- Thermal resistance for a layer cm 10: 0,1 / 0,05 2 = m² ° C / W..
More: others natural insulation