How to cut an opening in a metal tile for a pipe

Passage of a brick pipe through a metal roof

At the same time it is better to mount the pipe outlet with a separate box.

The area around the chimney must be filled with non-combustible insulation, such as high-density mineral wool.

Passage through the roof chosen depending on the cross section of the chimney, because it can be square, rectangular, round or oval.

How to organize the passage of a rectangular or square tube on a roof of metal

Installation of the protective apron around the furnace pipe

To adjoin a metal chimney, square or rectangular cross section, was tight, on a slope of the roof is made internal apron.

This is done using the upper and lower plates of the adjacency.

The bottom flashing is attached to the walls of the chimney, then mark its upper edge.

According to the marked line, choose a grommet that is not less than 1 cm deep.5 cm, with a slight upward slope. When you finish this operation, remove the dust, the same flush with water.

Install the interior apron, start with the bottom wall of the chimney, then continue on all other walls.

Do not forget to install the boards with an overlap of 15 cm, so you eliminate the risk of leaks. Inserted into the hole fill the edges of the filler elements with heat-resistant sealant.

Then, under the apron at the bottom bring the flat metal sheet metal necessary for water drainage. Direct it either into the valley or down to the roof eaves. At the edge of the roof, with a hammer and pliers, make the edge.

Often, in addition to these measures, before installing an internal apron, the pipe at 5 cm waterproofing is derived, its cut is glued with tape.

In this case the insulation must be heat-resistant. The place of the furnace entrance must be wrapped with a special film, for example. “Ecobit”.

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Chimney flashing options

Individual house, as a rule, is equipped with its own heating system, regardless of type: coal, pellet or gas. Often you can find a complex heating system in one house, which allows you to easily replace one fuel with another if necessary. But with any energy carrier in the obligatory manner on the roof of the chimney is organized in order to divert the products of combustion. As a result, during the construction process, the question of how to properly organize the adjacency around the chimney outlet inevitably arises.

Exit pipe through the roof: the scheme of the device.

The chimney can be organized in the following steps:

  • when carrying out major repairs or reconstruction of the roof;
  • When installing or replacing a new heating source;
  • in the construction of the building.

When installing a heating unit in an existing building, it is best to determine a separate room for the boiler, an annex. This contributes to the cleanliness of the house and the safety of residents. Yes, and the option of organizing the boiler room itself is less expensive and time-consuming.

Chimney exit through the roof of a metal roof

The chimney can be arranged at almost any stage of construction.

When installing a chimney through the roof of a metal roof, be prepared that you will have to do out through all roofing layers, including:

  • the ceiling finish inside the room. If the chimney is located closer to the wall, then, accordingly, and the finish on the wall;
  • attic floor;
  • rafter system;
  • vapor barrier layer;
  • insulation layer;
  • counter battens;
  • crate;
  • waterproofing layer;
  • metal roofing.

If the work is done carelessly, then in the operation can not avoid the following problems:

  • Moistening of the insulation layer and, as a consequence, the loss of its properties and qualities;
  • Moisture in the area under the rafters will cause leaks and rotting of wooden elements. Including leaks can be formed on the wall and ceiling;
  • Violation of the integrity of the rafters will lead to its destruction.

Chimney location

Initially determined by the place of the chimney out of the roof of metal. It is not recommended to install the chimney in the valley, as there is no possibility of complete waterproofing. In the winter in these places the biggest snow cover, which can lead to damage to the chimney adjacency to the metal roof and leaks.

It is also not recommended to choose the location of the chimney close to the dormer windows, as smoke or carbon monoxide can be by wind gusts into the attic room.

The best option. a place near the ridge. Regardless of whether it will be adjacent to the wall or go through the center of the structure without support.

The height of the chimney above the roof depends on its location.

Here is the smallest accumulation of snow in winter, the smaller exit of the chimney above the roof surface and the smaller risk of destruction of the chimney due to the effects of the weather. Another advantage of a small outlet chimney. minimum condensation in the cold season.

However, do not forget that the lower the slope of the chimney pipe, the higher it must protrude above the roof surface. Т.е. If the construction is located closer to the side wall.

Adjoining around the chimney outlet: design

Chimney pipes are made of a variety of materials:

For each different design of an outlet through a roof of metal, different waterproofing layers, according to building codes and regulations. The main influence on the choice of design has a type of energy carrier, a heating boiler or fireplace.

So, if you intend to use a chimney or coal, it is strictly forbidden to install a chimney from a metal pipe.

In addition, you should install spark arresters, which are a metal mesh. With this kind of fuel is recommended to thicken the layer of the chimney that is closer to the wall.

For better waterproofing pipe adjacency to metal roofing is recommended to organize a square or rectangular cross section, as for this type there are many variations of ready-made elements adjacency.

Building regulations and rules for mounting the chimney to the metal chimney defines the installation of combustible materials not less than 15. 23 cm from the outer surface of the chimney. These elements of the rafter system, vapor and hydro-insulating films, some types of insulation on the roof and wall.

Around the chimney organizes its own rafter system. For insulation use non-combustible materials based on basalt or glass.

If the outlet of the chimney is organized on the roof of the building in use, the vapour- and waterproofing materials are cut into the shape of an envelope and the edges are turned up and fixed to the rafters. Places of fixing the foils can be subjected to additional sealing by installing sealing tape or other adhesive material.

In the case of a rigid adjacency to the chimney may interfere with the circulation of air layers in the roof space. To avoid this, you must install an additional ventilation system, as an option. ventilation grilles or other similar structures.

When choosing a metal chimney around the chimney organizes a box filled with non-combustible material (basalt insulation, mineral wool, i.e.е. those that can also be used in the house wall).

Alternative chimney options

Before organizing the outlet chimney through the roof of a metal roof, you can consider using standard modular chimneys, also called “sandwich”. The material for the organization of such chimneys are:

Each material has its advantages and disadvantages, and is used depending on the energy carrier. The main advantage of such systems. it is possible to get rid of a strictly vertical installation of the chimney, which in the operation of the building is quite relevant.

Chimney outlet through the roof made of metal

When designing the heating of a country house you need to think about the ways of passing the pipe through the roof. You choose a place for it near the ridge, in this case the risk of condensation is reduced.

The option of passing the chimney “through the ridge,” is considered the simplest. In winter, snow does not accumulate on the ridge. Another way to pass. it is a pipe installed on the slope of the roof, not far from the ridge.

To bring the chimney through the roof of metal, you must first: to make a marking of the place of passage, cut a hole in the roof and install the lugs or a passing element (for the pipe round shape). Consider in detail each step of the work.


Preparations for the conclusion of the chimney through the roof

There is a next technology, how to make a hole in the profiled sheeting under the pipe:

  • First, with a permanent marker mark the place of its derivation to the roof.
  • The size of the cross-sectional elements of the chimney is selected taking into account the recommendations of the manufacturer of the heating unit. The thicker and higher the pipe, the easier the smoke comes out of the furnace. The main thing is that when connecting between the elements there should be no gap.
  • Cut the hole with an angle grinder with a thin blade for metal work, stepping back inside from the drawn line by a few centimeters. Decking should be cut accurately and slowly to the edge of the cut was not jagged.
  • In the corners of the hole make short cuts to bend the edges of corrugated board upwards.
  • A similar passage is made in the ceiling. Then install a metal box designed to connect the pipe to the rafters. The chimney is laid through the hole available inside the box.
  • Remove the vapour barrier and waterproofing material as well as thermal insulation from the exit cut out of the roof.

For cold regions, where the thickness of insulation material is more than 15 centimeters, you must use a sandwich pipe with two layers of metal and a layer of insulation between them.

With a round cross section

For single-layer and sandwich pipes there are factory-insulated passages of the appropriate diameter made of heat-resistant materials. rubber or aluminum-based composites. The peculiarity of these elements is that due to their flexibility they repeat the complex geometry of the waves of metal, thus providing a reliable waterproofing.

Fixed to the roof surface with sealant fasteners. Mandatory requirement in the organization of the passage of the pipe through the roof of metal. to create fireproof conditions of operation. To do this, the pipe must be enclosed in a separate box, filled with thermal insulating materials that prevent the ignition of steam-. Noise-. waterproofing, wooden elements of the rafter system.

Square or rectangular configuration

Area in which a square or rectangular cross-section chimney passes through a so-called roof pie, has a large heat loss. This is also where condensation can occur in the insulation. To avoid this, the pipe must have its own continuous rafter system. Flanging and inner wall profile are put under the metal roofing sheets. The chimney from the outside around the perimeter is trimmed with an apron.

Sealing of a chimney made of brick

Brick chimney protection is performed with the help of special elements of different shapes depending on the location and configuration of the roofing material. Manufacturers of building materials produce elements corresponding to a certain profile of metal. To seal joints special sealing tapes are used. The adhesive contains a mixture of aluminum and lead, is able to withstand large differences in temperature. Parts are attached to the four sides of the chimney, one edge is pressed to the wall, the second. to the roof or purlins. For reliability, it is desirable to cut grooves in the walls of the chimney to install the upper edges of parts. Masonry joints can be cut with an angle grinder with a stone grinding wheel. The cut should run along the surface of the brick, deepening the masonry joint is not recommended.

In the absence of details on sale you can make protection yourself As the material can be used galvanized iron, stainless steel or aluminum tin.

The material must be cut into 4 parts. the upper, lower and side. Blanks bend at the right angles, prepare the surfaces of the walls, observing the sequence, install and secure all the elements. Experts recommend installing an additional drain. a tie at the bottom of the apron. It is made of tin in the form of a triangle. The base is launched under the lower element of the apron, the two remaining sides have a small height rim. The apex of the triangle must reach the upper edge of the subsequent sheet of roofing. Moisture trapped under the apron will flow down, collect on the tie and drain off onto the roof.

If the chimney is large, it is desirable to install a small roof over it.

It will protect the exterior and interior surfaces from excessive rainfall.

The chimney is an important part of the roof structure, through which gases from the combustion of fuel leave the building. In developing a plan for the construction of a private home becomes a necessary part of the arrangement of the chimney in a metal roof. The passage of the pipe through a metal chimney affects the fire safety of the coating, so it is better to buy all accessories in specialized stores. The roof must be secured against possible fire of wooden elements of rafters and purlins.

Designing a chimney under a metal tile, according to state standards, is carried out before the start of construction. Sometimes there are unexpected situations when to make the passage of the pipe through the roof is finished in the house. This is the case when an old heating system is repaired or a new one is installed and the roof is re-installed. Conclusion stove pipe through a metal tile can be done by their own forces, in complicated cases, invite masters of the chimney.

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Measurements and calculations

On a roof with a ridge, the height is calculated according to the interval between the pipe and the ridge:

  • At an interval of 1.5 meters, the height of the pipe must be 0.5 meters higher than the roof ridge.
  • At an interval of 1.5 to 3 meters the ridge and the pipe must be at the same level.
  • If the interval between the pipe and ridge is more than 3 meters, the length of the pipe over the roof can be determined on the basis of a line that runs at an angle of 10 degrees from the ridge to the horizon.

Thermal insulation, waterproofing and vapor barrier must be at a distance of 15 cm from the brick or concrete chimney, if the pipe is a ceramic product, the allowable distance is 25 cm.

Chimney passage through a metal roof: sealing the adjacency

Metal roofing is considered one of the most reliable and durable. The place where the chimney passes through the metal chimney requires special care during installation.

How to circumvent the pipe? Depending on the type of pipe different sealing methods are used.

How to make a hole under the pipe in the metal tile

How to bring the chimney through the metal? It is necessary to begin with aperture.

The shape of the hole for the outlet pipe through a metal tile depends on the type of chimney:

  • Cylindrical. Oval-shaped hole is cut so that the gap between the chimney and its edges was 5-7 cm.
  • Square or rectangular. Brick chimney is often laid to the roof overlap. Rectangular hole is cut in the slope so that there was a 5-10 cm gap.
  • Through the ridge. This is the easiest way. Unfortunately, the possibility of a conclusion through the ridge is not common. A hole is made at the top of the sheets and covered with a ridge of increased width. Drainage aprons are glued on top of the first row of plates.

The hole for the passage of the pipe through the roof of metal roofing tiles should be cut with special roofing scissors. When working with an angle grinder overheats and becomes worthless polymer protective layer next to the cutting line. Cut edges should be coated with a special protective paint-primer to prevent corrosion.

Bypassing the chimney

The method of organization of the passage of the chimney through the roof of metal also depends on the type of chimney.

special aprons are made for the passage of the sandwich pipe through the metal tile. They are called “master-flush” and is a square sheet of aluminum, with a polymer resilient gasket installed around the perimeter. In the center of the sheet is glued to the aluminum corrugated tapered sleeve of heat-resistant plastic. The arm is designed to seal a round pipe.

When installing a master flush hole in the apron with the force is pierced chimney, the place where the plastic is additionally sealed with a heat-resistant sealant. The aluminum plate is led under the upper roofing plate with one edge and is fastened on top of the lower one with the other edge. Water from the top part of the slope must run down to the apron, and from it to the bottom. Similarly performed and the installation of a ventilation pipe on a metal roof.

For the passage of a brick chimney through the roof of metal on the chimney just above the roof level, laid a special stepped ledge (gap) that protects the place of passage of the water flowing down the walls of the chimney. Under it the edges of aprons are put. Instead of caulking can be drilled through the masonry parallel to the roof and an edge into the groove. The least reliable way to device adjacency. simple fixing to the masonry with screws on dowels. In all cases, the adjacency is sealed with sealant.

Around the outlet point of the chimney from the metal roofing sheets are laid additional crate (if it is not continuous). In the place of the passage on the inside of the battens, additional strips are nailed to support the “hanging” ends of the boards.

Cutting the pipe on the roof of the metal roof performs in the following order. First the lower apron is fastened. In the next step. the side, their lower edges must be located on the bottom apron. The last fixing of the upper apron, it must cover the edges of the side, but itself go under the top row of boards.

For fixing to the crate using roofing screws with sealing gasket. To the masonry aprons are attached to the dowels with galvanized self-tapping screws.

Waterproofing of the pipe

Waterproofing layer is designed to divert condensation formed on the inner side of the roof. This flow must not enter the underlay area.

When passing for pipes through the roof of metal roofing waterproofing membrane in the place of passage are cut “envelope”. The upper flap is let out on top of the upper apron, draining the moisture flowing under the slope. The bottom flap is wrapped under the bottom apron, the side flaps, respectively, under the side aprons.

Important! When working on the roof it is obligatory to observe safety rules. You must use a safety harness, a construction helmet, protective gloves and glasses.

Carried out according to the rules of the passage of the pipe through the roof of metal roof will keep dry and warm in the house. Such a roof will serve for a long time, performing its main function. the protection of tenants and building structures from the weather.

Chimney conduction in the finished roof

If the chimney is not output at the stage of construction of the house, but in an already completed roof, do the following:

  • Find a place for the outlet, taking into account the requirements of SNiP. This must be the space between the crossbar and rafters.
  • Made a box of beams, the cross section of which is equal to the cross section of the rafters. The box is made so that the width of its sides was greater than the diameter of the pipe by 0.5 m.
  • In the roof cut a hole equal to the perimeter of the box. To comply with it, from the inside in the corners of the box through holes are drilled.
  • The roofing material is folded outward, the pipe is inserted into the hole and fastened.
  • The box is sealed with a fireproof material for thermal insulation.
  • The joint between the pipe and the roof is sealed. Performed the installation of the flange (adapter).
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