Places where the roofing is in contact with the wall are particularly susceptible to the effects of flowing water. Therefore, where there is an adjoining of the roof to the wall, it is necessary to pay special attention to sealing and protecting the joint. There are two main types of connections - side and top. In both cases, it is advisable to use butt strips PS-1 and PS-2.
Why is it important
Ventilation pipes, chimneys, canopies and awnings, walls, etc. - all these adjoining elements are designed in a special way. Melt and rain water is collected in such places most often.
This is also facilitated by debris with foliage and branches, often accumulating exactly where the wind blows them.In winter, when snow accumulates on the roof, the junction of the roof to the wall is subjected to a particularly powerful load.
After installing the rafter system, it's time to finish the roof. Roofing from a metal tile fit with a small gap with the walls.
This is for ventilation. After that, it is necessary to make a groove in the wall with a depth of about 2.5 cm. A special sealant is glued onto the butt plate.
A bar is tightly inserted into the groove, then finally fastened with dowels. After the strobe is covered with silicone sealant. The adjoining plank is attached to the upper points of the waves of the tiles with screws or self-tapping screws.
If the roof is covered with rolled material, for example, bituminous or bitumen-polymer coating, the connection to the wall is processed in the following way:
- The joints of the material with the wall are fixed with clamping rails.
- Reiki are firmly attached with self-tapping screws.
- The joints are covered with silicone sealant.
- Alternatively, you can use the flashing method, that is, an elastic mastic is applied in combination with a reinforcing geotextile, it is covered with a second layer of mastic on top.
Note! The flashing method has proven itself well, thanks to the elasticity, strength and high tightness of the resulting seams. Thanks to it, all roof junctions remain completely waterproof for a long time. A simple and inexpensive method, high service life, resistance to various influences and the ability to carry out work independently - these are the advantages of this option.
The mastic is applied with a brush or roller, quickly hardens, while maintaining a very high elasticity. Adhesion occurs equally qualitatively with almost all materials.
The polyurethane contained in the composition gives increased plasticity and resistance to various kinds of influences. Such a coating serves from 20 years and more, and the temperature difference from -40 ° to + 75 ° is tolerated without loss of quality.
The preparation of joints for the flashing method is a little different. It depends on what materials the roof junction device is made of and on the configuration.
- All surfaces are thoroughly cleaned of dirt and dust.
- Rolled material with sprinkling is cleaned in places where mastic is to be applied.
- Polyvinyl chloride membranes are cleaned of dust and degreased.
- Concrete surfaces are coated with a primer to reduce moisture.
- Brickwork is plastered and left to dry completely.
- Large chips and cracks are covered with sealant before the main work.
- Mastic is applied to the prepared surface with a brush or roller.
- Geotextiles are laid on the mastic layer.
- A layer of mastic is again applied over the geotextile.
- The time interval between the application of each layer is from three hours to a day.
- After drying, if desired, another layer of mastic of the desired color is applied on top.
The consumption of mastic when processing docking points is up to 1 kg per square meter. Primer consumption will be up to 0.3 kg per m². Geotextile is consumed from preliminary calculations that must be made before purchasing it.
Adjacency of the roof to other surfaces
In cases where it is necessary to seal the joints of the coating with other surfaces, a slightly different technique is used. For example, if there is an adjoining of the roof to the parapet, the latter must be insulated.
The walls in this case are insulated by laying a layer of mineral wool. At the junction with the parapet, an additional layer is welded onto the roofing carpet.
Insulation sheets are covered with cement-bonded particle boards or flat slate. From a rigid slab of mineral wool, a side is made at an angle. It is glued onto hot bitumen directly into the corner.
The first layer of roofing is folded onto a horizontal plane by 15 cm, the second layer should overlap the previous one by 5 cm.
Next, they make out an apron made of steel, which will divert rainwater to the roofing surface. After these actions, the junction of the roof to the parapet will be reliably and permanently sealed.
Note! When the roof is adjacent to the chimney, it is advisable to use special strips. It should be noted that the pipe passes not only through the finish coating, but also through the attic and ceiling. Therefore, sealing must be performed on all three nodes of the pipe passage.
In the places of passage through the ceiling and attic, silicone sealant can be used, where the pipe passes through the roofing - strips.
Samu chimney on the roof it is recommended to install closer to the ridge bar. In the valley, the pipe cannot be removed, since it will be almost impossible to connect it to the roof with reliable sealing.
With a roof covered with bituminous tiles, it is best to use an adjoining plank. It will tightly press the knots to each other and will not allow water to get inside.
If the roof is covered with metal tiles, a waka bar is used. A wacaflex is placed under the bar, then the bar is closed and carefully covered with sealant.
Vacaflex is a rolled self-adhesive material that can also be used when processing roof joints with walls, parapets and chimneys.
Reinforced for extra rigidity and available in a variety of colors, the material is excellent for a variety of sealing applications.
When covering with metal tiles, it is desirable to use external and internal metal strips. Joints finished in this way will last a very long time without the need for repair.
The seams in this case will not leak, and the junction roof nodes will last from 25 years or more.
The connection of the roof with a wall protruding above the roof must also be processed.
A groove is made into which a part of the roofing is inserted. Then everything is sealed with a bitumen-based sealant. This sealant can be used even on wet surfaces.
End walls complicate the operation, because the roof adjoins them obliquely. Therefore, when sealing such joints, you need to be especially careful and accurate.
It is recommended to use corrugated aluminum tapes for sealing the joints of roofing with ceramic tiles.
The wavy profile of the material will repeat the shape of the tiles, and the bitumen poured further will give the seams absolute tightness. These tapes can also be used for shingles. A wide choice of colors of the material will allow you to choose the right shade for coloring roof coverings.
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