Calcium silicate bonded with sodium silicate. Although it is popularly considered an asbestos substitute, early uses of calcium silicate for insulation still made use of asbestos fibers. It is used in passive fire protection and fireproofing as calcium silicate brick or in roof tiles. It is one of the most successful materials in fireproofing in Europe because of regulations and fire safety guidelines for commercial and residential building codes (see Calcium Silicate use in Europe). Where North Americans use spray fireproofing plasters, Europeans are more likely to use cladding made of calcium silicate. High-performance calcium-silicate boards retain their excellent dimensional stability even
Building insulation materials hour fire rating according to DIN (German) standards. An additional source of insulation derived from hemp is hempcrete, which consists of hemp hurds (shives) mixed with a lime binder. It has little structural strength but can provide racking strength and insulation with comparable or superior R-values depending on the ratio of hemp to binder. Sheep's wool insulation is a very efficient thermal insulator with a higher performance than glass fibre and no reduction in performance even when condensation is present. It is made from the waste wool that the carpet and textile industries reject, it is available in both rolls