Küttetrasside

Küttetrasside is a term used in the Estonian-language building sector to describe a family of heat-resistant insulating masonry blocks designed for lining and insulating heating devices such as stoves, furnaces, and fireplaces. The term is most common in Estonia and parts of Northern Europe, appearing in construction manuals and product catalogues dating from the mid-20th century onward. The name derives from küte, meaning heating, and trass, a traditional term for certain heat-resistant masonry materials.

Description: Küttetrasside blocks are typically made from light aggregate ceramics or stone fibers bonded with heat-resistant binders. They are engineered to combine structural stability with low thermal conductivity, allowing them to contain heat while reducing heat loss to surrounding masonry.

Applications: They are used to line combustion chambers, flues, and chimney aisles, as well as to construct insulated envelopes around wood-burning stoves and industrial furnaces. They may come in standard modular sizes or be cut to fit irregular geometries.

Manufacture and standards: Produced by specialized refractory manufacturers and tile producers. Local building codes and stove manufacturers' instructions govern installation, curing, and maintenance. In some markets, products are labelled as küttetrasside blocks or under equivalent regional terms.

See also: Refractory brick, Firebrick, Insulation, Masonry.