Rain and snow are the most important enemies of any roof.The water flowing from the roof easily penetrates into the places where the cover is joined to the chimneys and walls, having a negative impact on them. To prevent the destruction of the roof and the premature failure of the roofing material, such an additional element as the abutment strip is used. What its purpose is, what kinds it happens and how it is mounted, we will consider in this article.
Description
Plank of abutment is a corner with differentdimensions of the sides, made of galvanized steel sheet or the remains of soft roofing material. It is installed to protect the rafter system from moisture.
Depending on the method of installation, the protective plate can be of two types:
- upper;
- lower.
The upper bar is laid in the docking pointspipes and roofs (from the side of the ridge) to the roofing material. Most of the bar is put under the roof, so that the water draining down does not fall on the wooden crate and insulation material. The other edge is attached to the pipe using self-tapping screws.
The second variant (the lower apron) is installed at the bottom wall of the pipe (on the reverse fracture of the roof) and is laid directly on the roof covering.
For flooring made of profiled sheet and metal, a product made of steel, coated with a protective polymer layer, is used.
If the roof is bitumentile or roll coating, the joint can be made out of both metal and soft materials. In this case, the abutment strip will look like an even strip.
Now consider the process of mounting all options.
What materials and tools will be needed to install the bar
Before starting work, care must be taken to ensure that the following materials and tools are at hand:
- measuring instrument (measuring tape, ruler);
- a hammer;
- electric tools (screwdriver, Bulgarian);
- pliers;
- wooden slats;
- roofing seal;
- self-tapping screws, nails;
- silicone sealant or bitumen mastic.
First, let's look at how the abutment strap is installed in the case of using metal roofing material.
The process of mounting the upper bars
The abutment strap (upper) is set as follows:
- In the places of the break (where the roof will be joined to the pipe), a crate with a very shallow step is installed.
- A sheet that will cover the fracture, a littlePush outward so that it closes the junction. As a connecting element, a curtain rod is usually used. Between the sheet of roofing material and the connecting element, a special sealant (intended for mounting additional roof elements) is laid.
- Places of abutment to the wall are fixed by screws. The height of the vertical part of the bar should be at least 50 cm. All edges are waterproofed with bituminous mastic or silicone sealant.
Fitting the lower apron
Now let's look at how to properly install the inner apron (the abutment bar is the bottom one).
- On the walls of the pipe, the height of the upper edge of the strip is marked with a marker.
- After the fixing point of the bar isit is determined, in a brick wall (with the help of a Bulgarian) make a special shtroba (depth not less than 15 cm). It will be installed edge bend, located at the end of the plate adjacent to the wall.
- It is strictly forbidden to shatter between bricks! This can lead to a break in the integrity of the pipe.
- The resulting channel is cleaned of dust.
- The vertical edge of the strip is placed near the wallpipe, setting the upper edge into the prepared hole. The fixed element is fixed by means of several screws. On all sides of the tube, the laths are lapped (15 cm) and treated with a waterproofing compound.
- Under the lower edge of the resulting design is laid flat metal sheet (in other words - a tie), which is designed for water drainage. He is sent to the valley or to the cornice.
- Next, the main coating is laid.
The device of the abutment on the soft roof
Soft roof itself is considered an excellent waterproofing material, which does not require additional protection. Soft coatings include:
- bituminous shingles;
- rolled materials (eroruberoid);
- polymeric membranes;
- mastic materials.
Plank joining the shingles and roll coatings is arranged as follows:
- Work begins with the installation of triangular slats,which is necessary in order to raise the edge of the coating. It can be made from a regular bar (with a section of 50x50), cutting it diagonally. The resulting countercrack will serve as a barrier to moisture.
- On the plastered wall a layer of bitumen mastic is applied.
- Next, the installation of roofing material.
- In the corner joint of the roof and pipe cover (over the tile), protective strips are installed. Usually for these purposes, additional elements are used - valleys. The width of this strip is 50 cm.
- The inner side of the valley is coated with a waterproofing compound - a bitumen primer or a silicone sealant.
The width of the strip adjacent to the wall should be about 30 cm. In regions with a harsh climate (where a lot of snow falls), this figure can be increased.
Helpful Tips
- Before proceeding with the arrangement of the junctions,pay attention to the thickness of the material used as a strip. It can be equal to the thickness of the main roofing, however, it is preferable to use elements no thicker than 0.5 cm, because they are more flexible and better take the desired form.
- The curtains made in a brick wall must be thoroughly rinsed with water, as the remaining dust in them will prevent the good adhesion of the silicone sealant and the substrate.
- The waterproofing compound should be applied only on dry surfaces.
In this article, we looked at how correctlythe abutment strap is installed. The photos and the installation instructions will help you to perform these works yourself, which will avoid the costs of attracting qualified roofers.
We hope that we have answered all your questions.
