Guideline 3 - Insulation Systems / Calcium silicate

Calcium silicate

Insulation made of man-made materials

Calcium silicate is an insulation material comprised of hydrated calcium silicate, normally reinforced by incorporating fibres.

Typical final product is calcium silicate boards. The perforation and cutting can be done at the construction site without losing the thermal properties of the material.

Calcium silicate is widely used insulation material for historic buildings, since it has capillary active structure, therefore wicks away the possibility of moisture accumulation in buildings structures.

As other advantages high pressure resistance, non-combustibility and frost-resistance can be mentioned. Moreover the high bulk density of the material leads to sound-absorbing properties.

Thermal conductivity of calcium silicate is about twice as high as conventional insulation materials. The Reference standard EN 14306:2009 gives typical values for calcium silicate thermal conductivity as 0.063 W/(m K) at 10 °C.