Types and rules of work - Instruction + Photo and Video

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.

General information

Depending on the material of manufacture, chimneys are:

• Brick;
• Steel single-circuit;
• Steel sandwich chimney;
• Ceramic;
• Asbestos-cement;
• Polymer.

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.

Types of sealant

In hardware stores you can find a wide range of sealants. They can be divided into several groups:

1. By composition based on silicone and silicate;
2. By the number of components - one-component and two-component;
3. Temperature-resistant and heat-resistant sealants.

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 heat-resistant sealants

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.

Advantages :

• Ability to use for sealing structures of any material due to chemical inertness;
• Silicate base is resistant to ultraviolet radiation and any weather events. Can be used for outdoor chimney treatment.

• Allows, due to the porosity of the top layer, carries out additional processing;
• Possesses high water permeability.
• Has increased strength after the curing process;

How to work

When working with refractory sealants some rules must be observed:

• Work with insulating surfaces up to + 40 ° C and standard humidity;
• The butted places to obtain a strong connection must be rough. Therefore, before gluing, they must be treated with abrasive materials, degreased with acetone, allowed to dry;
• Due to the increased strength of the seam, it is not advisable to use this sealant for elements operating in vibration.

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:

1. Neutral sealants release water and alcohols into the environment during polymerization. These substances do not affect the material of the chimney, therefore they can be safely used when sealing a chimney structure made of stainless steel.

   And iron oxide, formed as a result of high temperatures, due to its brown color, makes the fact of adhesion more invisible.

2. Acidic sealants, unlike neutral ones, produce acetic acid during hardening, which can lead to corrosion of the metal elements of the chimney and destruction of the contacting roof surfaces. Therefore, they are not used to seal the chimney system.

Advantages of heat-resistant sealant:

• They stand out for their great ability to glue different surfaces of ceramics, glass, bricks, soft roofing materials.
• Due to its high flexibility after polymerization, this type of sealant allows you to maintain the strength of the connection under the influence of temperature conditions, as well as vibrations of the open parts of the chimney;
• Moisture-proof and UV resistance makes these materials indispensable for sealing external chimney elements and installation of pipes for various purposes on the roof.

Thermal tape

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

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.

Cement

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:

1. I fill asbestos with water and bring it to a homogeneous mass;
2. Homogeneous and swollen a mass of asbestos is mixed with a portion of cement;
3. The joint between the roof and the chimney is coated with the mixture;
4. Operation of the chimney system is possible after the sealing mixture has completely dried.

What to look for when looking for a sealant

When choosing a sealant, consider the following points:

1. Operating conditions of the heating device;
2. Location of the joint or seam (inside the pipe, outside the chimney or roof);
3. Temperature regime of the treated surface: In general, heat-resistant agents are used to seal chimneys
4. Consistency and composition of the sealant: solid silicone is best used for cracks in brickwork;
5. Material for making chimney elements.

Properly selected hermetic means will save you from unforeseen expenses for cleaning or dismantling the chimney installation.