The heating system of any suburban real estate consists of a heating element (stove, fireplace or stove) and a smoke exhaust system gases. The chimney refers to the system for removing carbon monoxide gases into the atmosphere and is the link between the combustion plant and the chimney.
During the operation of the heating service, a very high temperature of more than 700 ° C rises inside the chimney. Under the influence of heating, pipes are deformed. The entire structure of the chimney is distorted, tears and cracks appear.
The flue gas movement of the chimney is disturbed. Carbon monoxide begins to penetrate into the interior of the dwelling and settle on the surface of the pipes. It becomes impossible to live in such a room. The accumulation of soot on the pipes provokes the formation of condensation and can be a source of ignition for the chimney.
Depending on the material of manufacture, chimneys are:
Therefore, when installing the chimney, it is very important to choose the right method and material for sealing. This will preserve the integrity of the terminal structure, give it resistance to mechanical and other loads.
In hardware stores you can find a wide range of sealants. They can be divided into several groups:
One-component sealants are easy to use, often used in the insulation of the chimney structure.
They contain one component. No need to mix before use.
Two-component preparations for work are mixed according to the instructions in a strict proportion. And they should be used within two hours. The use of such isolating agents is mainly observed among professionals.
Heat-resistant and temperature-resistant sealants are mainly used to seal chimneys. The differences between the sealants of this group are the size of the temperature regime and the location of the area to be sealed.
Heat Resistant Sealants are insulation products that retain their properties at very high temperatures up to 1300 ° C. , and at low loads - up to 1600 ° C. They are produced on a mineral (silicate) basis.
Available in dark gray or black. Ideal for joining joints in steel and stainless steel flue ducts and for sealing surfaces made of brick parts.
Fire-resistant silicate allows to process cracks in fireplaces, stoves by direct contact of the sealant with fire.
When working with refractory sealants some rules must be observed:
Heat-resistant sealants are manufactured on a silicone basis. They are used in areas with temperatures up to 350 ° C and only when assembling the external surfaces of stoves and chimneys from natural bricks.
When using such a sealant, not only temperature is important, but also the thickness of the applied layer. The insulator uses moisture from the air during polymerization. And if a layer is applied more than indicated in the instructions, there is a possibility of getting an unstable connection of surfaces.
There are two types of silicone sealant:
And iron oxide, formed as a result of high temperatures, due to its brown color, makes the fact of adhesion more invisible.
Advantages of heat-resistant sealant:
For sealing the edges of chimney pipes made of plastic and stainless steel, a thermal tape is well suited. It is easy to use. It is necessary to first heat the edges of the material, and then wrap the joint with thermal tape. Due to its ability to shrink itself, the tape is reduced in size and fits snugly on the pipe joint.
Heat-resistant adhesive is used at temperatures up to 200 ° C.
Made on the basis of polyurethane, acrylic or silicone. Resistant to negative temperatures. Thus, it allows processing in the winter season, gluing joints and surfaces made of natural materials and concrete. Ideal when working with external fireplace surfaces, as well as sealing the joint between masonry and roofing.
Sealing the chimney with cement is a fairly long forgotten method since the last century.
However, it is still used today. The binding agent in this case is an asbestos-cement mixture in a ratio of 1: 1.
The mixture is prepared by hand as follows:
When choosing a sealant, consider the following points:
Properly selected hermetic means will save you from unforeseen expenses for cleaning or dismantling the chimney installation.
Posted By: Work Style |02, Nov 2020
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