How to bring the chimney through the roof, the height of the

Heating appliances are a necessary attribute of any residential building, providing a comfortable temperature for life in the cold period, which lasts 9 months in most regions of Russia. However, additional comfort comes in conjunction with a certain degree of risk of fires. Therefore, special attention is paid to the chimney, with the help of which smoke and combustion products are removed from the heat generators and removed outside the room. This article will tell how to get a chimney through the roof in compliance with all safety requirements.

Consequences of poor installation

As a rule, the chimney’s installation services are not included in the work of the stove-setter or gas equipment installer; The imaginary simplicity of the task forces home craftsmen to refuse the services of professional roofing masters. Nevertheless, poor-quality conclusion of the pipe to the roof faces serious consequences:

1. Moisture seeps into the masonry through a leaky pipe passage, gradually destroying the brick chimney.
2. The increased humidity inside the chimney flue stimulates the spread of mold microorganisms and fungi. The spores of some species of fungus are dangerous to the human condition, so it is not safe to use the infected tube. In advanced cases, both the chimney and the stove are to be replaced.
3. The penetration of water into the passage of the chimney through the roof reduces the insulating properties of insulation in half. Moreover, after drying the thermal insulation layer, its characteristics will never return to the previous level.
4. Even the truss system suffers from poor-quality removal of the pipe through the roof, since moisture penetrating into it through a leaky passage leads to rotting and destruction.
5. The gaps near the passage of the pipe disrupt the normal circulation of air inside the attic, leading to increased energy losses, heating costs.

By the way, not only furnace chimneys are brought to the roof, they also place pipes from gas boilers and ventilation outlets, for the installation of which they use the same methods.

The choice of the location of the output of the chimney and its height

The first condition for the quality of the output pipe through the roof - the correct placement of the chimney on the roof. The functioning of the entire heating system depends on this factor, therefore, in order to avoid mistakes, the installation is carried out in accordance with the building and fire safety requirements:

• Chimney pipes are placed in the immediate vicinity of the highest point of the roof, at a distance of 1-1.5 m.
• The recommended height of the chimney relative to the ridge of the roof to ensure normal stove draft is 0.5-1.5 m.
• The greater the height of the chimney, the greater the force of traction in the furnace or gas boiler it provides.
• The lower the pipe is located on the slope, the greater must be its length so that the recommended height of the chimney above the roof complies with the recommendations.
• Parameters such as the height of the chimney, the diameter of the cross section is chosen according to the recommendations of the manufacturer of the thermogenerating device or based on the calculation.
• The chimney consists mainly of vertical sections of pipes, the length of horizontal segments should not exceed 1 m.
• Place the output is placed between the elements of the truss system, so as not to violate its integrity.

The main difficulty in holding the pipe through the roof is that the temperature of the walls increases during the passage of smoke, which makes it dangerous to ignite combustible materials in the roof system.

Elastic penetration

Most often in private construction are faced with the installation of metal pipes of circular cross section. To ensure the tightness of the passage, use a special device - elastic penetration. This product is made of high-strength silicone or rubber, shaped like a funnel with a wide flange in the form of a square or circle, called an apron. Due to its properties, elastic penetration takes any shape, adjusting to the angle of inclination of the slope. It withstands extremely high or low temperatures, exposure to aggressive chemicals and has a wide palette.

When purchasing elastic sinking, they are guided by the pipe diameter and the color of the roofing material. Universal models, in the form of a stepped pyramid, are suitable for any size, fitting is done by trimming the penetration to the desired level. It is very simple to install an elastic apron on the roof, you need to put it on the chimney passage, put a metal circle with holes for fasteners, process the joint with fire-resistant sealant and fix it with a screwdriver. For roofs with steep slopes apply a special type of penetrations of plastic with a given angle mounting flange.

Metal feedthrough

In the building stores you can find another type of penetrations for round pipes - a metal feedthrough. It is used to carry out the passage of the chimney through a roof without relief. Ready-made alloy steel pipes have a standard roof angle, which is selected on the slope of the roof. To install, you must:

Cut a suitable hole in the roof. To do this, using a marker on the surface of the roof markup is applied. Depending on the roofing material, the cutting is done with a grinder or sharp scissors, stepping back 1-2 cm inside the circle.

• Remove the waterproofing and insulating material from the hole, freeing the passage for the chimney. If necessary, remove the elements of the batten, carefully cutting off them.
• On the underside of the roof, secure a sheet of fire-resistant material with an opening of the required diameter of such an area that there is a margin of 15-20 cm on each side of the chimney.
• Push the module of the pipe into the hole, connect it with the laid chimney, tightening the junction with a clamp.
• To put on the discharge pipe on the pipe, fixing on the surface of the slope with fire-resistant sealant and screws with a rubber hat
• To add a pipe with new segments so that the chimney height reaches exceeded the ridge level by 0.5-1.5 m.

Some masters prefer to use a different method - they are previously sealed in a chimney pipe through the inlet, insulating it with thermo-insulating material, for example, stone wool, and only then this structure is mounted into the passage.

Conclusion of rectangular and square pipes

Chimney stoves and fireplaces made of brick, most often square or rectangular in shape, so use other methods to bring it to the roof. This task is for an experienced oven master, and not a home craftsman, because the process uses a special masonry technique. When the chimney is approaching the roof, a hole of the appropriate size is cut in it with an allowance of 2-5 cm, through which the stove-maker leads the pipe to the roof. Although heat-resistant brick perfectly keeps the heat inside the pipe, from the inside the passage is cut off with asbestos sheets to protect the rafters from fire.

A soft waterproofing tape on a lead or aluminum base, the lower edge of which is fixed to the roof with a sealant, is attached to the brick pipe with a metal profile. After this unsophisticated waterproofing is closed with a special decorative apron. It consists of four additional parts and is installed under the roofing material, making the passage neat and well protected.

Installation of the outlet box

The roofing structure consists of layers of several materials, the refractory qualities of which are expressed in different ways. While most roofing materials do not burn or support combustion, the roof system, traditionally made from wood, does not possess such properties. In order to safely remove the chimney through any material, mount the passage box:

• The first step is to acquire or make a box of refractory material, for example, metal or asbestos. The size of the box is selected in accordance with the cross-section of the pipe, so that between their walls was at least 15 cm.
• After the hole is made, a duct is installed in it, the top edge is aligned with the level of the roof slope.
• Remove the chimney through the hole in the passage box. The edges of the waterproofing film and vapor barrier are glued to the pipe with fire-resistant sealant and reinforced tape.
• The claydite is poured inside the box or stone wool is laid to insulate the chimney. Thermal insulation materials are placed taking into account the fact that they should not impede air circulation.
• Outside, the chimney pipe, depending on the shape and roofing material, is trimmed with an elastic penetration, decorative apron or metal pipe.

A well-made chimney outlet does not spoil the appearance of the roof, does not let in moisture and is safe from the point of view of fire prevention regulations. Observe the correct technology for the passage of tubes through ceilings to protect yourself and your property.

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