Rain and snow are considered enemies of any roof. Water, flowing down the roof, enters the zones of joints of the roof covering with walls and chimneys, having a detrimental effect on their condition.
A special additional element is used to prevent damage to roofing and destruction of the roof.
This is the abutment strip for the roof.
This element is a corner with different sides. It is made from the remnants of soft roofing material or from galvanized steel.
The main purpose of the abutment roof strip is to protect the entire structure from moisture rafter system .
It is required for various rectangular roof elements: chimneys or ventilation shafts. Conventionally, all strips can be divided into two types, depending on the type of installation:
The lower part is inserted under the joint of the roof covering, and the upper one lies in the joint over the roof covering.
True, some experts consider the upper bar to be the one that gets under the roof and is located on the highest side of the pipe, and the lower one is placed on top of the coating under the pipe itself.
Depending on the choice of roofing material, metal or corrugated board , a strip of similar material is required. It can be galvanized steel coated with a special polymer paint to match the roof.
If the roof is covered with bituminous soft tiles , or one of the modern roll materials is used for this, then the joint itself is made of them.
In this case, the abutment bar will look like a strip.
Let's analyze the installation technique in detail metal tiles and corrugated board , for which it is necessary to arrange joints with external and internal aprons.
Before proceeding with the installation of the roof covering, the internal apron must be installed around the chimney.
For this, the lower strips are used.
From the upper ones, their construction is by longitudinal bends of the edge, which the first are absent .
The hem is folded up to prevent moisture from entering. The so-called drainage tie is mounted below: this is the name of the sheet, the edges of which are bent.
In the same order, on top of the metal tile and corrugated sheets, the external apron is mounted. The plank is a corner, in the design of which there are no edge bends.
This is an extremely reliable technology, but additional metal will be required. Wanting to save money, they often use the technique of laying only an apron.
It happens as follows:
To arrange a bend on a vertical element, a recess is made in the brickwork.
In different climatic regions, many roof manufacturers prefer to produce their own slats.
Additional elements for metal tiles and corrugated board look different.
A plank with diagonal edges is possible, which protects the corner joints from getting wet: streams of rain are diverted to it in different directions.
When installing soft roofs made of roll materials or bituminous tiles, the strip has a completely different design.
On the one hand, it bends in the form of a dropper, on the other, it is diverted towards the wall at an angle of 45 degrees.
When arranging nodes connections, it is important to remember a few points.
The strobe is made up to 15 mm deep. The dust formed during operation is washed off with water so that it does not interfere with the better adhesion of the brickwork and silicone sealant.
How to ensure tightness?
Various types of roof sealants can be used: based on polyurethane or silicone, acrylic and thiokol. However, for a roof made of metal and corrugated board, a product with silicone is best suited.
He has remarkable qualities:
Particularly impressive quality of the composition is its unique ability to withstand sudden changes in temperature during the day. In the sun, the coating of steel is capable of warming up to almost a hundred degrees, at night it quickly and strongly cools.
But when using silicone sealant, it must be remembered that its adhesion to polymer materials is rather low.
And the most important thing is that there are no trifles at the junction that do not deserve attention. Everything is important here, because it is here that leaks are most often possible, which can damage not only the structure, but also the decoration, and even property.
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