At first glance, it may seem that a person who is not initiated into the process of furnace business does not concern the waterproofing of the pipe on the roof in any way. But in fact, if the chimney is not protected, then due to the temperature difference, condensate may appear, which will accumulate on the walls and drain into the chimney.
During heating, it evaporates and pressure is created that interferes with stove draft. Also, the chimney can collapse from the strong steam pressure that is created in the furnace.
There are cases when the owners in winter began to heat the stove strongly in order to warm themselves in frosts, and at first it smoked and then was torn to pieces.
The reason for this is the condensate that has accumulated in the chimney. That is why it is very important that the sealing of the pipe on the roof is of high quality.
This also serves as a security measure. It is necessary to arrange insulation for chimneys in rooms with stove heating, country houses and baths.
How to make waterproofing?
Currently, the construction market has a wide variety of materials suitable for these tasks, which can be steel, asbestos concrete or brick.
They are produced in the form of rolls or plates, so you can always choose what fits your oven.
The most popular are slabs made from millilite silica, also called kaolins.
This material is characterized by increased strength and flexibility, and is able to withstand temperature changes, does not undergo combustion, and does not emit harmful substances into the atmosphere. They can be used not only to isolate chimneys, but also for saunas, pools and baths.
To your attention! It is necessary to arrange insulation of chimneys from the outside. First, the pipe must be plastered, and then insulating boards are glued onto the wet plaster, on top of which the cladding is made. If the structure is made of asbestos cement or metal, then it must be insulated with cotton wool or rolled material.
These materials are divided into:
- Cotton wool MKRR-130;
- Roll filter MKRF-100;
- Plates MKRP-340.
The digital index determines how dense the material will be.
Advantages of insulated chimneys:
- Increases the thermal efficiency of furnaces.
- Using stoves becomes safer.
- Waterproofing gives aesthetics.
The heating of the chimney is due to the gases that exit the furnace. Thanks to this, a gentle thermal regime is maintained.
The moisture that is released from the fuel is released into the atmosphere along with the flue gases and therefore no condensate settles.
Due to this, the efficiency of the furnace increases, and its design lasts longer, and cracks from high pressure do not form in it.
Let's look at the waterproofing device on gable roof on the example of a three-level waterproofing. What does it mean?
- The first level - a superdiffuse membrane is glued to the pipe using bituminous mastic. To do this, the pipe is primed with polymer-bitumen mastic and, wrapping the edges of the membrane up, it is glued.
- Now, even if moisture can get on the membrane, it will not get to the place where the pipe is connected to the roof.
- The second level includes the device of the lower and upper ties made of metal corners. The sheets must be laid with an overlap of the upper ones on the lower ones so that the water can always roll down. According to the rules, the bottom sheet must be extended to the overhang of the roof, but it can also be left short.
- True, then you will need to make sure that moisture will get on the membrane, because the main task is to ensure the removal of moisture from the pipe.The corners need to be fixed on the bars of the battens, made additionally, then everything should be treated with sealants and nails should be planted on the dowel.
- The next level is laid ondulin end-to-end on the structure: double pitched roof. The joints are sealed with bituminous mastic, then a plastic cover apron is laid. It is made on the bottom and sealed with an onduflash in a circle. Onduflash is a bitumen-rubber waterproofing tape, which is attached to the corner from one end, and to the ondulin with the other.
Now let's talk about the ventilation pipes on the roof. Many people ask why roof ventilation is better.
There are many reasons for this:
- The efficiency of the hood will be the same regardless of the direction of the wind.
- A running electric motor will not be heard in the house.
Thanks to modern devices, it is possible to carry out ventilation through ventilation for various purposes, as well as various additional units and devices:
- Flagpoles, antennas and pipes.
- Ventilation of the space located under the roof.
- Ventilation of premises from the inside - residential and utility rooms, sewer risers, kitchen hoods, central vacuum cleaners.
You can make a pipe pass through the roof of any type: pitched or flat, which has any roofing. To do this, elements intended for the passage are used. Ventilation of the space located under the roof.
As noted earlier, condensation constantly forms in the roof. This is due to high humidity, which causes fungus and mold. However, if the rafters rot, they will not be able to hold the roof.
Tip! The accumulation of condensate can be avoided by ventilating the under-roof space. Roof aerators are usually used for these purposes.
The choice of product depends on the design of the roof and the type of roofing material, for example, such a design as hipped mansard roofwill require additional effort.
Such ventilation is carried out due to temperature and pressure differences. It is worth noting that under the roof there is a movement of air from the bottom up.
Air enters through the holes made in the eaves, and back through the aerators. They should be installed as high as possible. In order for them to work normally, you need to provide them with an influx of air coming from under the eaves.
Ventilation of rooms carried out through the roof
Ventilation outlets must be attached vertically to the roof. They will direct air flow, create traction and protect the ventilation system from precipitation.
The ventilation pipe on the roof consists of ventilation outlets and air ducts, which are connected by adapters.
If desired, an electric fan can be installed at the exits. He will not make noise in the house and will make a good forced hood.
It also mounts on any roof.
sewer ventilation
Gases emanating from the sewer riser can cause great harm to health, and not only create an unpleasant odor. They can also destroy pipes due to chemical aggressiveness.
Therefore, you need to make a ventilation pipe to the roof. This will equalize the pressure in the sewer, which will ensure normal operation for the water seal. In order to prevent the formation of a crust of ice at the exits in winter, you need to buy options that have thermal insulation.
Hood outlets
The ventilation pipe can also be used as an outlet for household ventilation and extractor hoods that remove exhaust air from the room. They direct the flow of air, provide traction and protection from precipitation.
It is worth noting that the height of the ventilation pipe on the roof should be the same as that of the chimney, if it is located next to it.
Another question that arises when installing a pipe is how to equip a pipe on the roof? The main problem that arises here is how to create protection against rainwater that flows down.
To solve this problem, you need to arrange the roof in such a way that the bottom of the roofing material goes to the pipe. In this case, it is necessary to make a cutout for the pipe in the roofing material lower than the pipe, with a margin so that you can push the roof sheet under the overlying one.
The problem lies not in the difficulty of slipping a flat fender sheet under the roofing sheet located on top, but in the fact that the width of the fender must be large and a profiled sheet can be easily slipped under it. Otherwise, the roof may bulge.
To your attention! To make a chipper, you need to take a profile sheet and attach cardboard to it, onto which the roof profile is transferred. After that, through the stencil, the markup is transferred to the profiled sheet, with a margin of 5-10 cm. Everything that will be located above the markup will be a chipper that will rise above the roof. Everything below will go under the roof top, located on top.
In order to smoothly go around the roof, use scissors to cut strips with a width of 2 cm. Bend them with pliers.
After that, you need to attach the chipper to the top sheet in such a way that a sealed joint is formed. There are several ways to do this.
The easiest and at the same time the most expensive is to purchase a high temperature sealant, which is designed for places that are very hot.
For example, fiberglass is suitable, which will qualitatively glue the chipper to a metal roof. In the event that slate is used, then an adhesive based on cement and high-temperature putty is suitable.
In the event that you have a semi-automatic welding machine, you can boil a strip of metal by thoroughly welding the joint and make a chipper like that.
If you don’t have such an opportunity, then you can visit the nearest car service, where they do bodywork, they have a lot of experience with welding, so they most likely won’t refuse you there.
In the place of welding, you need to walk with epoxy putty and paint it to match the color of the roof. It will be very reliable and beautiful.
The most important place is the place located above the chimney and along the wave of the roof a little to the side. This place is small in size, so sealant should not be spared. After all, if you save money, then you will have to climb onto the roof and correct mistakes.
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