Metal tile is today one of the most versatile roofing materials. It is made in the form of galvanized steel sheets: the raw materials undergo a special treatment to obtain the effect of imitating natural tiles, and the surface is treated with a polymer coating of different colors. This type of roofing material has good technical characteristics, such as light weight of sheets, strength and durability, ease and speed of installation. Consider the question of how to cover the roof with metal tiles, in detail.
Preparatory work
Before installation, it is necessary to carry out preparatory work, which is the laying of waterproofing and the assembly of the lathing of the roofing system, as well as the calculation of the required amount of material.
Waterproofing works
Moisture condenses on the metal roofing, as a rule, on the inside, which over time leads to undesirable consequences, such as corrosion, rotting of roof rafters, etc. For this purpose, waterproofing and laying of internal ventilation are carried out. In the question of how to cover the roof with metal tiles, this stage occupies an important place. The following is information that will be useful:
- The waterproofing is overlapped, starting from the eaves up, while under the ridge leave a gap of more than 50 mm to create air channels.
- A carpet of waterproofing materials is laid on the logs or rafters, while it must be strengthened with a crate system.
- Ventilation openings must be provided at the highest point on the roof.
- In the attics without heating, they create natural ventilation - end windows, if necessary, they build in means for forced air circulation.
Crate system assembly
To most fully open the question of how to cover the roof, consider the main points of the assembly of the crate system. To perform the crate, it is necessary to use durable boards, having previously treated them with an antiseptic. Recommended size is 30 × 100 mm. Installation of the bars is carried out with a certain step, the value of which is indicated in the instructions attached to the kit. This interval corresponds to the wave step on the sheets.
The laying of the beams begins from the bottom edge, while the very first block should be 1-1.5 cm thicker than the other elements of the crate in thickness. The boards are fixed across the rafter beams using self-tapping screws. The end plan bar is placed above the crate system to the height of the wave ridge, and is fastened to the rafter beams with galvanized steel nails. For a solid installation of the ridge plank, additional bars are provided. The cornice strip must be fixed before installing the tiles. The crate in the valley, around the chimneys and dormers, must be laid in a continuous layer.
Calculation of the amount of raw materials
In order to understand how to roof the roof with metal tiles, you need to consider that the calculation of the number of sheets of material is carried out for each slope separately, and consists of the following steps:
1. It is necessary to check the symmetry of the slopes by measuring them diagonally - these values should be equal.
2. Then calculate the number of rows on the roof slope. To do this, it is necessary to measure the length of the slope of the roof from the valley to the eaves. This value must be divided by a useful indicator of the width, which is determined by subtracting the overlap value from the actual width of the sheet of metal tile. The result should be rounded to integers in the direction of a larger value. As a rule, tiles are produced with a width in the range of 1.17-1.2 m, while the working value will be the same - 1.1 m, and the remainder is used in laying with overlap. For example, for a slope with a length of 7 m, the calculation will be as follows: 7 m ÷ 1.1 m = 6.36 ≈ 7 rows.
3. Next, calculate the number of sheets in a row, to do this, determine the total length of the sheets by adding the length of the slope, the descent of the cornice and the overlap value. At the same time, it is taken into account that the tiles are let out with a maximum length of 8 m, and if the total length of the roof slope with a descent does not exceed this value, then the overlap value is 0. However, transportation and installation of bulky material is difficult, also such sheets require trimming. And if the wave difference on the tile coincides with the cut line, then this can lead to undesirable consequences, for example, to deformation or difficulty in assembly. To avoid such situations, it is necessary to choose the optimal sheet length. For example, with a slope length of 6 m and an overhang length of 0.5 m, two sheets of 4 m long can be stacked, with an overlap of 0.25 m.
4. The total number of tiled sheets is determined by the number of rows and the number of sheets in a row: 7 rows × 2 sheets = 14 sheets per slope.
Necessary tools
Also on the question of how to cover the roof with metal tiles, information about the tools used will not be out of place. During installation work, a fitting of the roofing material is necessary. You may need the following tools:
- Special tool for cutting metal tiles.
- Hammer.
- Screwdriver.
- Ruler.
- Marker.
As a special tool for cutting sheets, it is recommended to use a jigsaw, a metal saw with teeth from Pobedite, scissors and other devices. It is important to remember that the use of cutting tools with abrasive wheels, such as a grinder, is excluded. This is because the resulting high temperature can destroy both the polymer coating and galvanization, which will lead to corrosion and destruction at the molecular level.
Installation of a roof from a metal tile
After preparatory work, they begin to assemble the material. In this case, you need to consider important points:
- The sheets of metal are asymmetric, they also have top and bottom, so when laying, the material consumption increases.
- A roof with two slopes is covered, starting from the front side, and a tent-type roof on both sides from the highest points.
- The overlap along the length of the sheets is provided equal to 250 mm.
- A plumb line 40 mm long is made along the edge of the cornice.
- The metal tiles are fixed with self-tapping screws in the depth of the wave, for each meter of coating, 8 pieces of connecting elements are needed.
Covering a roof made of metal is very economical, since installation work with tiles is not so difficult. Today, in the building materials market, one can find various roofing materials, the prices of which are presented in a wide range. It can be noted that metal is the most inexpensive and suitable material for most building options. The right choice and a good installation will help save your home from any weather troubles.