Roof junction strip

Atmospheric precipitation is enemy No. 1 for a pitched roof. Water is collected from the entire roof area and rushes down in a stream, with additional force acting on oncoming obstacles: walls and pipes. The roofing in these places violates its integrity, forming joints. An abutment bar is used to protect the joint.

As a rule, round joints are used for pipes. The junction bar is used on rectangular surfaces, such as chimneys, ventilation shafts. This part is attached on each side and looks like a triangle. Depending on the installation technology, there are two types:

• top;
• lower.

The upper part lies at the joint on top of the roofing, and the lower part goes under it. However, some builders believe that the top bar is the one that is located on the highest side of the pipe and goes under the roof covering, while the bottom one, on the contrary, is laid under the pipe and on top of the cover. When using profiled flooring and metal tiles, a strip made of the same materials is used: galvanized steel with a polymer coating of the same color. When using soft bituminous tiles or rolled material, the joint is formed from these materials, and the junction bar has the form of a strip.

Plank designs and mounting technologies

To begin, consider the installation technology of corrugated board and metal tiles, which provides for joints with internal and external aprons:

1. Before laying the roof covering, an internal apron is laid around the chimney using the bottom strips. Their design differs from the upper ones by the presence of longitudinal bends of the edge.
2. First, the part is laid from the low side (under the pipe), then the sides, and lastly from the top (above the pipe). The folded edge is directed upwards in order to create a barrier to moisture. A water-removing tie is arranged below - a sheet with curved edges.
3. Each plank is first applied to the wall, on which its upper edge is marked. A strobe is punched along this strip. It is cleaned of dust, the bend of the edge of the vertical part is inserted into it and filled with sealant. The horizontal and vertical part of the part is attached to the crate and the wall with self-tapping screws.
4. Next, the roofing is laid.
5. On top of the sheets of corrugated board and metal tiles, an external apron is laid in the same order. The design of the bar is a corner without edge bends.

Video: This technology is quite reliable, but, on the other hand, it provides for additional metal consumption. Therefore, the technology of laying one apron is often used:

1. The roofing is laid first. A sheet of corrugated board or metal tiles does not fit the entire length of the roof slope, but only up to the upper edge of the pipe.
2. A lower apron (top bar) is placed on top of the sheets, then side parts and lastly an upper apron (bottom bar). The surface of the brickwork is chiselled for the bending device on the vertical part. After mounting the strips, all seams are covered with sealant. Self-tapping screws are used as fastening.
3. A part of a sheet of corrugated board or metal tile is placed on the remaining part of the roof from the ridge to the upper edge of the pipe.

It is worth noting that the designs of slats for many roof manufacturers in certain regions of the country differ. Additional elements for corrugated board and metal tiles can be of this type.
Or, for example, a plank with diagonal edges has the right to exist. It diverts rain streams in different directions, protecting the corner joints from getting wet.
The slats are completely different when constructing a roof made of soft bituminous tiles or rolled materials.

1. The connection to the chimneys and roof parapets begins with the installation of a triangular rail, which will raise the edge of the roofing carpet to create a counter-slope, which is a natural barrier to precipitation.
2. Next is the installation of the roofing. A valley carpet is laid on top of the tiles in the corner joint.
3. The plank protects only the upper edge of the junction from moisture ingress between the brickwork and the roofing material. From one end it is bent at an angle of 45o towards the wall, from the other end it is bent in the form of a drip. For additional waterproofing, silicone sealant is used.

When installing junction nodes, the following practical tips should be taken into account:

1. The thickness of the plate can correspond to the thickness of the sheets of corrugated board or metal tiles, but it is better to take the material no more than 0.55 mm. Such parts bend better, and therefore take the shape of an angle well.
2. The strobe is carried out using a grinder to a depth of 15 mm. Dust generated during the chasing process is best washed off with water. Otherwise, it will interfere with the adhesion (adhesion) of silicone sealant and masonry.
3. Silicone sealant should be applied to a dry surface.

By the way, specialists and non-professionals are often concerned about the question: how is it right to use a strobe or a strobe? Both of these words are located in dictionaries, and denote a stepped ledge. Today there is no clear division into correct and incorrect pronunciation. Therefore, both of these words have the right to use, according to the principle: who was taught how. Many types of roof sealants are used: based on silicone, polyurethane, thiokol, acrylic. But the best thing for a roof made of corrugated board and metal tiles is silicone material. It has great features:

• one-component;
• elastic;
• moisture resistant;
• withstands UV radiation;
• high adhesion with concrete and brick.

What especially distinguishes it is the ability to withstand daily temperature fluctuations. The steel covering of the roof can get very hot up to a temperature close to 100°C, and cools down quickly at night. However, silicone sealant has poor adhesion to polymeric materials. This property must be taken into account when used on vertical surfaces. And finally, there are no trifles unworthy of attention in the junction points, because it is in these places that the greatest number of leaks occur that spoil structures, finishes and property. We recommend watching the video: