The name of the sandwich chimneys is due to the features of the device of their pipe, which is a combination of internal and external channels with a layer of thermal insulation laid between them. All those who would like to learn how to connect a sandwich pipe should definitely be familiar with their design.
The main differences between chimney products from different manufacturers associated with the technical characteristics of the pipe channels and the type of material used as a thermal insulation strip.
In most products of this class, the inner pipe is made of stainless steel, while the material for the outer pipe channel is usually more expensive copper or brass. In addition, these structures differ in the diameter of their constituent pipes, as well as the thickness of the insulation layer. Chimneys in different versions may also differ by the temperature conditions in which their normal operation takes place.
Mineral wool is used as insulation in sandwich constructions, which by its physical characteristics resembles the well-known asbestos fiber.
The thickness of the heat-insulating gasket made of cotton can be from 30 to 60 mm, which provides the necessary stability of the structure to the effects of aggressive media and elevated temperatures.
Among the undoubted advantages of sandwich chimneys are their following remarkable properties:
The lightness of the construction of a sandwich-type chimney eliminates the need for foundation, which is another confirmation of its undoubted advantages.
Arrangement of the opening in the ceiling
Preparatory measures in this situations are reduced to the protection of the passage of chimney through the interfloor overlap. For the safe installation of pipes in such areas, a special structural element is used (the so-called "through-hole"), the installation procedure of which is as follows:
Joining of the chimney elements in the places of their passage through the ceiling is strictly prohibited.
Chimney Assembly Scheme
Chimney Installation Features We suggest you consider a sandwich with your own hands on the example of a two-loop system well known to most builders.
Installation of the structural elements is carried out from the bottom up, i.e. from the heat source towards the exit of the chimney.
When assembling, the next section of the inner tube is inserted into the already mounted part, while the outer billet is simply put on the previous one. A similar order of assembly of the structure will allow you to protect the chimney duct from the ingress of foreign moisture into it.
It should be added to the above that when installing the sandwich chimney, one of the options for placing the exit part above the roof plane can be chosen.
Chimney pipes on the roof - scheme
floors When installing the flues of the type we are considering, a number of features of the following plan should be taken into account:
In order to ensure the possibility of regular cleaning of pipes from the accumulated during operation of the burning chimney should be equipped with a special hole with a door (the so-called "revision").
For detailed instructions on installing a sandwich chimney and its features, see the following video:
Chimney internal installation scheme sandwich
External installation scheme of the chimney
Chimney pass through the ceiling
Elements chimney sandwich
Chimney in the ceiling