Installation of the chimney "sandwich". Recommendations made.

users forumhouse.ru They are well aware that quality installation metal chimney has a direct impact on the security of residence in the cottage. We have already written about, how to choose a heating system for private homes. It's time to tell about the mounting features of the steel chimney.

What is a sandwich chimney?

Despite the large selection of materials for the installation of smoke removal systems, the most widespread in the private housing construction got steel sandwich chimneys.

Chimney type of "sandwich" represents two tubes of different diameter inserted one into another, and all the free space between them is filled with non-combustible insulation - mineral wool.

Mineral wool at the same time plays the role of insulation and an insulator.

The main advantages of the sandwich-flues are:

• high rate of installation and cheapness compared with brick chimneys;
• light weight smoke systems;
• smooth internal walls of the chimney provide good traction and help to reduce soot formation;
• the use of acid-resistant grades of stainless steel ensures a long service life of the chimney.

It is important to know that the temperature of the exhaust dymogazov depends on the type of boiler and the fuel used. The higher the temperature of flue gases, the stronger the tube is heated and, accordingly, all components through which it passes. Understand the dependence of the temperature dymogazov on the type of boiler and the type of fuel used will help in the following table.

It should be remembered that no sheltered tree begins to char at a temperature of 200 ° C. Good seasoned wood can catch fire from the open flame source at a temperature of 270-290 ° C. But if the wood is subjected to a constant heat over 24 hours, it can become self-igniting at a temperature of 170 ° C. Therefore, the installation of the chimney sandwich is important to comply with all fire safety measures. And any mistake made at this stage can lead to tragic consequences - fire and loss of property.

Urban (Member FORUMHOUSE):

All my friends burned down two houses because of incorrectly assembled sandwich chimney. And in both cases, a fire occurred at the point of passage through the chimney hardwood floor.

According to statistics, 80% of fires occur because of improperly installed chimney. Therefore, the selection and installation of the flue must adhere to SNiP 41-01-2003 "Heating, ventilation and air-conditioning."

Proper penetration through the chimney hardwood floors

As practice shows, the largest number of questions appear in the calculation of the distances from the chimney to the hardwood floors.

VadimPro(Member FORUMHOUSE):

I built a house, with the distance between the rafters 60 cm. And then it turned out that under existing rules my chimney does not fit into the distance.

vova230(Member FORUMHOUSE):

According to the rules, when drilling through the wooden beams must withstand a distance of 38 cm from the inner tube to the combustible sandwich structures. All this space should be filled with non-flammable material. If a standard does not ensure the passage of this distance, it is necessary to further increase.

Protection of wooden structures - log, the ends of the rafters, sheathing - is ensured by galvanized sheet sandwiched between him and the tree asbestos cloth thickness of at least 5mm.

Galvanizing the following functions:

• prevents the spread of fire in the ceiling;
• It provides uniform heat dissipation;
• shields and it reflects the heat radiation coming from the pipe.

In the case of penetration intermediate floors monotube steel chimney distance to no protected wooden structures must be at least 50 cm!

Also, the parameters of the chimney should be calculated so that the flue pipe is passed through the overlap entirely - without joints with other elements. Chimney itself is established through the tube-passing a breaker, which is a metal box /

Alexey Telegin(Member FORUMHOUSE):

According to standards, the thickness of the cut (metallic box) must exceed the slab thickness of 7 cm.

the installation process itself is cutting in hardwood floor can be divided into a series of sequential steps:

1. Cut a hole in the ceiling of at least 700h700 mm.

2. remove or strengthen floor beams if necessary.

3. The perimeter of the opening is sutured cut fireproof materials such superizolom.

4. For tightness under superizol bazaltokartona puts a sheet.

5. Making the bearing frame of galvanized steel profile, which is used for mounting the GCR.

6. Frame Dimensions are calculated by fixing polyurethane components (ceiling-passage node).

7. Closing the aperture or sheets minerita superizola with a hole for passage of the inner part polyurethane.

8. Anchoring PPU.

9. Set the sandwich pipe.

10. Insulate the lower part of the foam and the space around it with non-combustible insulation, this will avoid frost and frost and condensation.

It is also important to pay attention to how the pipes are connected to each other. There are two ways - "the smoke" and "condensation". What does this mean?

• Stykovanie "the smoke" - lower knee sandwich pipe enters inside the upper knee of the sandwich pipe. In this case, the flue gas move upwards freely along the walls of the tube.
• Splicing "of condensate" - the inner tube sandwich: the top is inserted into the lower, outer tube sandwich: the bottom is inserted into the upper. With this arrangement, the condensate flows down smoothly and does not flow over the outside of the chimney, which can lead to fire.

Kotlasky(Member FORUMHOUSE):

The tube of condensate is typically set to modern gas boilers, since they have low temperature of outgoing smoke.

In metal, iron burzhuek smoke temperature - about 300 ° C steam, which is released when burning wood begins to condense at a temperature less than 100 ° C. In the kindling point pairs falling on the cold walls of the chimney, it is deposited in the form of water droplets that roll along the smooth walls of the chimney down into condensate.

Features of penetration through the roof

Overall penetration through the roof is on the same principles as the passage through the overlap. It is believed that when drilling through the rafter distance protected wooden structures may be reduced to 150 mm. Is it correct?

Alexey Telegin(Member FORUMHOUSE):

It is assumed that in the sinking of the chimney through the roof cools down, and the space around it is well ventilated, so you can reduce the distance to the protected rafters. In my opinion, this is true for a cold roof, and when warmed need to apply the rules and distance as in the intermediate floors.

As for the height of the chimney:

• chimney protrudes not less than 50 cm above the uppermost point of the roof at its location less than 1.5 m from the parapet or the ridge;
• the upper section of the chimney is aligned with the ridge when its axis is at a distance of 1.5 to 3 m from the ridge;
• if the distance from the apex to the chimney exceeds 3 meters, the upper part of the tube located at the level of an imaginary line drawn down from the ridge angle of 10 ° to the horizontal.

To summarize: the correct installation of the chimney starts another home design stage. The only way to comply with all the requirements of fire safety standards and distances, without resorting to costly rework already erected floors and roof system.

All information about the requirements for boiler users forumhouse.ru can learn in this topic. Hot discussion right sandwich chimney installation is carried out here. In this topic It tells fires occur for whatever reason. clicking this link you will learn how you can not do chimneys.

In that video It tells of fireplaces and chimneys. And this a movie you can learn how to repair furnace Swede.