Fireplace or stove heating - indispensable attributes of a country or country house, which gives them extra comfort, warmth, comfort. Even with the proliferation of heaters that run on natural gas or electricity, they have not become less popular, especially when it comes to the construction of traditional Russian baths. When building a fireplace, the most crucial, difficult moments are considered to be the removal of the chimney through the roof and waterproofing the joints between it and the roofing material. In this article, we will describe how the high-quality sealing of the chimney exhaust hub affects the durability as well as the reliability of the roof.
The consequences of poor sealing
The place where the chimney stove or fireplace is displayed on the street, called the chimney passage knot, or simply penetration. It washes located in the wall or on the roof of the structure, with the second inference option being considered more popular, but also more dangerous from the point of view of leakage. If the waterproofing of the joints between the furnace chimney and roofing material is not implemented in a quality manner, then during the operation of the roof, the homeowner may encounter the following problems:
- Leakage. According to statistics, which lead experienced roofers, most of the leaks on the roof occurs due to gaps or cracks between the chimney and roofing material, not properly sealed.
- Rotting truss frame. The penetration of atmospheric moisture through the joints between the chimney and the roof leads to a gradual rotting, deformation of the roof frame, made of wood.
- Reduced chimney draft. Inadequate sealing of the joint, pipe mating on the roof and roofing material leads to condensation and cooling of the chimney, which negatively affects the force of thrust in the system.
Note! High-quality waterproofing of the joints between the chimney and the final covering of the slope is the key to a long service life and reliable construction. Practically all roofing materials are completed with special additional elements or elastic covers to isolate the exit point of the chimney to the street.
Waterproofing of the chimney pipe on the roof is done during the final stage of roofing, so some developers neglect this technological operation in order to save time or money. However, non-embedded seams of the part cause leaks and accelerated wear of the structure. High-quality sealing of the chimney is a complete solution for the following tasks:
- Improving the safety of furnace heating. The stove chimney, especially if it is solid, heats up to high temperatures, so the place of its withdrawal on the roof is isolated from a wooden flammable frame.
- Increase energy efficiency. Thanks to the insulated seams, heat losses through the roof slope are reduced, which leads to fuel savings and, consequently, lower heating costs.
- Condensate protection. Waterproofing the chimney allows you to keep the temperature of its walls in order to reduce the process of condensation.
Skilled craftsmen note that in addition to practical tasks, the sealing of joints between the chimney and roofing material performs aesthetic functions, making the appearance of the roof more complete and organic.
Requirements for waterproofing
Some time ago, the masters used improvised means from roofing to isolate the exit node of the chimney. Currently, construction stores have a huge range of materials, equipment and accessories, with which the waterproofing of the chimney is easily done by hand. These requirements are:
- Resistant to moisture. Since the chimney is on the roof, it is constantly affected by atmospheric moisture. So that it does not remove insulation from standing, the material from which it is made must have high moisture-resistant and anti-corrosion properties.
- Resistance to temperature changes. The furnace chimney can be heated to a temperature of 500-600 degrees, so waterproofing materials should have a low thermal conductivity and tolerance to ultraviolet radiation.
- Wear resistance. Since the bulk of roofing materials has a service life of 15–20 years, the materials and additional elements should also serve for a long time in order not to replace them every 2-3 years.
- Compatibility with roofing material. Galvanized additional elements are used for sealing joints between the chimney on the roof of metal tiles, corrugated roofing and folded roofing, ceramic tiles for ceramic tiles, bituminous for soft tiles.
Important! Chimney pipe waterproofing is never performed with a household silicone-based sealant, petroleum bitumen or cement. All materials are selected taking into account the temperature of the outer walls of the pipe at the outlet and the type of roofing materials.
Variety of means for sealing
The presence of ready-made sets of additional elements for sealing seams greatly simplifies the task of the roofer, so waterproofing the chimney can be done with your own hands while observing safety regulations and work technology. There are the following types of means for sealing the site of the passage of the stove pipe or fireplace through the roof
- Metal aprons. The most common means of chimney insulation, used for pipes of square and rectangular cross-section. It is a composite structure of metal corners, which is attached to the slope of the roof and the outer walls of the chimney. Suitable for corrugated roofs, metal tiles, folded roofing, slate.
- Rubber seals. Latex or rubber seals resembling a funnel are used to insulate round pipes. They are stretched on the chimney, tight to it, and then fixed to the crate through the roofing material. Master Flash seals are used for roofs of roll and piece of bituminous materials.
- Membrane materials. Diffuse membranes in the form of strips are glued around the perimeter of the chimney to protect against moisture leakage. They are suitable for round and rectangular pipes, however, do not look so aesthetically pleasing.
It is believed that the most reliable waterproofing is achieved with the construction of a multi-layer structure consisting of a rubber sealant, an internal apron and an exterior decorative edging.