The thermal properties of a building depend to a large extent on the choice of materials and their associated properties. Heat can be transported through transmission, radiation and convection. In this context, the heat transfer of a material is specified with the thermal conductivity (W/mK). The most effective insulating material is air, but only if it does not circulate and thus convection, a transporter of heat, is avoided. Porous and light materials in organic or inorganic form are particularly well suited for insulation.
The following points need to be kept in mind:
One should look into the ‘cradle to cradle’ philosophy for all the preferred materials and technologies in order to plan a truly sustainable building.