Surface and waterproofing for metal roofing: installation and installation

Metal tile is the most popular roofing material among all the analogues that the construction market offers. The popularity of this coverage is explained by the fact that it has a number of positive operational qualities. These include relatively low cost, durability and ease of installation. The material for the manufacture of such flooring is galvanized steel with a polymer two-sided coating. In this article, we will consider the main points regarding the laying of waterproofing for metal roofing.

Features of the

structure The crate is the foundation for the roofing with metal tile. This design is designed to evenly distribute the weight of the roof covering along the rafters and supporting walls. The presence of the crate provides the functionality of the roof, protecting the walls of the house from destruction.
Tiling for metal can be made of such materials:

• plywood flooring;
• OSB plates;
• boards made of wood.

Depending on the frequency of assembly of parts, the design of the crate is divided into the following types:

• sparse type;
• solid view.

One-piece construction will help to prevent deformation of the roof under the influence of loads. Therefore, the frame, laid by a continuous method, is used for soft roofing. The version of the rarefied litter is more suitable for metal tile. The profiled steel from which the coating is made has a high strength in order to withstand all possible loads during operation and at the same time not to be deformed.

When deciding whether a waterproofing is necessary for metal roofing, it is also necessary to take into account the fact whether the room under the roof will be heated or not. In case if it is supposed to heat this space, in addition to the waterproofing, it is necessary to build a grating. This design will help ventilate and remove steam from the structure of the insulation. If you do not plan to heat the room under the roof, it will be enough to lay a film of waterproofing on the rafters.

Material selection criteria for

When selecting raw materials for a frame structure, some of the characteristic features of the materials should be considered:

1. The boards for the structure should be between 25 mm and 32 mm thick.
2. When choosing materials, you should focus on the distance of the rafter pitch. For example, if the space between the rafters is 0.9 cm, then the thickness of the boards should be more than 32 mm. At a smaller distance, respectively, we choose the smaller thickness of the boards.
3. To ensure a waterproofing under the metal tiles has served a long time, you should take into account the difference in thickness between the boards. The indicator should not exceed a mark of 2-3 mm. If the given value is larger, there is a possibility that the rafters will not be able to join the rafters during laying. This in turn entails uneven installation of the coating. Therefore, it is better to refrain from purchasing material with a deviation from the given indicator.
4. The width of the boards should be 10-15 cm. It is desirable that the length should be a multiple of the step of the rafter, but this is not a prerequisite. The boards can have different lengths, but in this case after cutting there will be less waste.
5. Remember that you do not need to purchase a planed board. The cost of such material is quite high. A standard material is quite suitable, which has minimal differences in terms of thickness. Before proceeding with the installation process, the crate must be impregnated with an antiseptic compound to protect the structure from rotting and ignition.

Mounting of the axle structure

Under the metal tile is laid a layer of waterproofing, which is attached to the rafters by means of a construction stapler. The task of this layer is to protect the structure from the negative effects of moisture due to condensation. It is collected on the inner surface of the roof as a result of temperature changes. Under the influence of moisture, the insulation gets wet, which leads to a decrease in its heat-insulating qualities. In addition, due to moisture penetration there is rotting of the border, freezing of the roof and the appearance of mold. To protect the structure from destructive phenomena, the following actions should be performed:

1. Beginning with the lower part of the roof, it is necessary to overlap the anti-condensation film. The width of the layer should be about 10 cm.
2. Then you need to put a counter-rack on the rafters. To do this, you can use boards of 30x100 mm or bars with a section of 30x55 mm. The bar or board should not be brought to the overhang, leaving a distance of 15-20 cm.
3. It is necessary to avoid the appearance of a protruding fragment at the edge of the overhang. To do this, the thickness of the first board should be greater than that of the next element by 10-15 mm. The declared step of the lathing under the metal tile will allow the construction to be firmly entrenched on the base.
4. The first bar should be fixed to the ends of the rafters along the entire length of the overhang. It should be ensured that the fastening is in a straight line and does not extend beyond the cornice.
5. Next to the priority board, it is necessary to fasten the metal bar for the eaves and the vertical board. This should be done with screws. The step size between the 1 st and 2 nd boards should be 5 cm less than the spacing between the elements that will be stacked afterwards. In this case, the space between the following fragments must match the length of the profile of the tiles to be mounted. So all the boards of the structure are assembled.

Important! To ensure that the distance of the step between the cornice board and the subsequent fragment is correctly chosen, it is necessary to perform the following actions:

• put two boards that should be placed parallel to each other;
• from above we lay a sheet of shingles;
• the layout of the boards should be equal to the section for fixing the shingles. In this case, the resulting improvised cornice should contribute to the necessary flow of water;
• if the size of the cornice is more than is required, the flow of water will overflow through the trough. Otherwise, water will flow to the wall between the frontal board and the gutter.

1. At the end of the installation of the crate, the next step will be the installation of end plates and ridge boards. For the strength of such a bar, you should additionally nail boards with a section of 25x100 mm. They need to be mounted in the place where the ridge is fastened.
2. Lay the first sheet of shingles in such a way that its edge extends 30-40 mm beyond the ledge of the cornice. Due to this, water from snow and rain will immediately fall into the gutter without penetrating the cover.
3. In places where pipes, windows of the attic or skate are adjacent, the crate must be laid with a continuous flooring. In the area of ​​the ridge, the width of the board can be made larger, since here, in addition to the edge of the profiled sheet, the metal profile must also be fastened.

Rules for calculating the step

There is a recommended step size of the battens, which is 350 mm. This distance allows you to mount the cover sheets at the bottom of the wave. However, such an indicator is not universal. The following rules will help to determine the correct pitch of the step:

1. The space between the boards depends on the type of roof. This value is determined by the distance from the bottom of the first board to the upper section of the next.
2. In addition to the type of roof during the calculations, it is necessary to take into account other moments that determine the step of the roofing: the size of the eaves, the roof slope, the gutter parameters.
3. If there is a gutter installation, you need to add at least 3 cm to the ledge. For example, if the diameter of the chute is 9 cm, you need to make a projection of the same size. And with a diameter of 12 cm - a little more.
4. The size of the protrusion is calculated from the front plate. In the absence of such an element, the calculation must be made from the cutting of the rafters. For the necessary water drainage, the protrusion index should be determined depending on the ridge angle. The smaller the angle, the larger the projection. Based on these indicators, the calculation of the step is determined.
5. We calculate using a level up to 1.5 m in length. Measure the space between the upper part of the first wave and the lower edge of the shingles. Then on the rafters put a mark on the level. This indicator will be equal to the level of fixing the board.
6. The first board should be somewhat thicker than the others in order to support the weight of the roofing material. The remaining fragments should be nailed in accordance with the marks that need to be applied through two rafters, given the size of the roofing profile.

Installation of drainpipe

Going to the next stage of work, it is necessary to perform such manipulations:

1. To the vertical board we fix the sewage channel.
2. Brackets for installing the chute should be installed before laying the metal tile. It is recommended to mount them according to the width of the tile wave, observing a distance of 50-60 cm. The fastening occurs on the bottom board of the crate.
3. The assembly process should begin with fixing the two end brackets. As a result, a 5 mm slope per meter of length should be obtained.
4. Then, between these two attachments, you should pull the rope, which will perform an auxiliary function when installing the remaining brackets.
5. Then the chute is installed, and after the lath of the eaves.

Conclusion

The reliability and strength of the roof depends on the foundation. To ensure the quality of the coating, evenly distribute its weight and prevent the destruction of the house, before installing the roofing material it is necessary to install a crate and waterproofing. The installation process of this construction is not difficult and does not require qualified training. After reading the rules of the workflow, you can mount the crate, without resorting to the services of specialists.

On the video, you will see what kind of crate is under the metal and how to fix it correctly: