It is necessary to think about the organization of the chimney at the stage when it is only planned to install a fireplace or stove. Consider how the passage of the pipe through the metal tile should be organized.
Chimney outlet through the roof
When organizing the output of the chimney through the roof and roofing, it is necessary to solve two problems:
- Pipe penetration through the roof must be fireproof.
- The pipe passage must be airtight.
To solve the first problem, it is necessary to isolate materials prone to fire, preventing them from coming into contact with the surface of the pipe. The second task is solved by a number of measures during roofing work.
It is clear that the place on the roof, in which the through passage is made, is extremely vulnerable. Therefore, in case of violation of the technology of work, it is here that moisture leaks are possible.
Where on the roof should the pipe be taken out? From the point of view of organizing the junction, the roof ridge would be the best option. Indeed, in this place of the roof, snow pockets never form, so the likelihood of leaks is reduced.
But this option is not without drawbacks, since you will have to design a truss structure without a ridge beam, or make this beam with a gap. In this case, it will be necessary to install additional supports for the rafters, and this is not always convenient if the attic is planned to be used.
Therefore, sometimes they plan to bring the pipe out on a slope in the immediate vicinity of roof ridge. In this case, the snow bag will not be able to form, so the junction will be easy to make.
But it is categorically not recommended to build a chimney at the intersection of the slopes (near the valleys). This place on the roof without a pipe outlet is very vulnerable, so it will be incredibly difficult to make a high-quality connection.
How to protect the roof from leaks at the outlet of the pipe?
So, the pipe is brought to the roof. How to make the roofing material hermetically adjoin its surface or, in other words, how to make the chimney pass through the metal tile?
For these purposes, a roof structure is used, which is called an internal apron. For its device, internal junction strips are required - metal corners.
As a rule, junction strips are purchased together with the rest of the roofing accessories, so they have the same color as the entire roofing.
For the device of the inner apron, the following tools will be required:
- Bulgarian with a disk thickness of 2 mm;
- Marker;
- Long metal ruler;
- Hammer and pliers.
We organize the adjoining of the metal tile to the pipe by performing the following work steps:
- The junction bar is applied to the surface of the pipe and a line of its fit is marked on the brick (in the same way, ventilation outlet for metal tiles ).
- Using a ruler, the line is transferred to the three remaining sides of the pipe
- Using a grinder, make a strobe 2 mm wide along the marked line.
Advice! The strobe should pass along the surface of the brick, and not at the place of the masonry seam.
- Upon completion of work with the grinder, the working surfaces must be thoroughly cleaned of the resulting dust. It is advisable to rinse the surface with water and allow it to dry.
- The strobe is filled with a colorless silicone sealant, then the edge of the abutment bar is inserted into it. The plank is fixed with self-tapping screws.
Advice! It is necessary to start mounting the inner apron from the bottom wall of the pipe, that is, the one that is turned to the cornice, and not to the roof ridge.
- By the same principle, parts of the inner apron are fixed on all other sides of the pipe.
- In the event that it becomes necessary to join the planks, you need to overlap with a width of 150 mm.
- Further, a sheet of metal is wound under the lower edge of the inner apron, which roofers call a tie. The purpose of installing this element is to ensure that water is drained towards the drain or the nearest valley. Along the edges of the tie, it is worth making small bumpers using pliers and a hammer.
- On top of the finished apron and tie, metal tiles are installed around the pipe.
- The next stage of work is the installation of an external apron.
Advice! When moving on the roof, safety measures must be taken. In order not to damage the roofing, you need to wear shoes with soft soles and step only on the location of the crate only in the deflection of the wave. To ensure the safety of the worker, he must be put on a mounting belt with a safety halyard.
- After completing the installation of the roofing around the pipe, they begin to install the outer apron, which performs not so much a protective as a decorative function.
- The installation of the outer apron is carried out similarly to the installation of the inner one, only the outer junction strips are simply attached to the pipe, without chasing its walls.
The method described above, in which the adjunction to the metal tile pipe is organized, is perfect for rectangular brick pipes. But what if the pipe is round and made of metal?
Today, this problem is easy to solve: manufacturers of materials for roofing equipment offer ready-made solutions - a roof passage for a chimney. Such a passage is a base made of a flat sheet of steel and a cap hermetically connected to it. Inside this cap, the chimney pipe will pass.
An apron purchased or made from adjoining strips must be securely fixed to the roof structures. However, experienced craftsmen do not recommend making the fastening of the apron with the chimney rigid.
The fact is that due to shrinkage of the roof or due to thermal expansion and contraction of the pipe itself, the created structure can be damaged.
To avoid this, the craftsmen advise putting on the so-called skirt (clamp) at the junction of the pipe with the apron, which is fixed with a heat-resistant elastic gasket. This design is airtight, but not rigid, so it will not be destroyed when the linear dimensions of individual structural elements change.
conclusions
The junction of the pipe to the roofing material is one of the most vulnerable sections of the roof. Therefore, its arrangement should be treated with double attention.
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