Chimney

According to their constructional materials, chimneys can be divided into brick or module chimneys. The module chimneys can, in turn, be divided into block module and metal module chimneys.
The advantage, but sometimes also a disadvantage, of brick chimneys can be their relatively large weight. Installation of brick chimneys is indeed quite a handful, but due to its large mass it saves a large part of heat passing through smoke flues upon heating up the fireplaces or stoves. So with a fireplace that collects heat, not much energy is lost. At the same time the large mass of a brick chimney can also be a disadvantage, especially when the chimney is built on an old foundation. An average brick chimney weighs 1 – 2,5 tons depending on the amount and size of flues. This presents clear requirements upon the foundation. The favourable characteristics of brick chimneys are also long-term traditions and a wide selection of stones with different finishing that turn the chimney into a true element of décor.
In Estonia, the most widely used module chimneys are Fibo and Schiedel. Their advantages regarding brick chimneys lie in their short installation times, high fire resistance and light weight of the material. These types of module chimneys are built using a high fire and acid resistant firebrick flue surrounded by fire resistant rockwool isolation. The outer wall is made of a special chimney module. The chimneys come in different sizes starting from one smoke flue up to two flues and ventilation flues. Due to higher fire resistance, the module chimneys and bearing timber constructions are allowed to have only 5 cm space between them; for the brick chimneys the allowed space is 10 cm.
The metal module chimneys enable more expedient space solutions and more complex roof bushings. Metal chimneys can be installed right from the heater or fireplace, saving a lot of room in the living room as well as in sauna. The metal elements consist of 6 mm outer and 6 mm inner layer of stainless steel. Fire resistant rockwool of 60-100 mm is installed between these two layers. The 60 mm layer is suitable for heating up fireplaces where the temperature in the chimney will not exceed 350 °C. 100 mm layer should be used for heaters where the temperature can exceed 350 °C.