To cut the roofing material, it is necessary to make an accurate calculation of the roof from the metal tile, for this you need to know the parameters of the building and the roof.
Therefore, you should take all dimensions, as well as clarify the details with the roofing contractor and the supplier of materials.
They are repelled in calculations from the length of the roof slope and the size of the eaves.
A metal tile sheet is almost always fixed to the base in such a way that the lower edge protrudes from the eaves by 4 centimeters.
Your attention!
It is important to know that the measurement of the roof and measurement must be carried out after the final installation of the truss system.If the roof elements are not all ready, then this should also be taken into account, otherwise the accuracy of cutting the material will be low.
If you have project documentation, you should still clarify all dimensions, since the dimensions of the drawings sometimes differ from the actual values.
All dimensions are taken with a tape measure by the contractor. If the roof structure is complex, then it is divided into separate planes and all distances are measured for cutting material and geometric construction.
For a gable roof, the number of roofing sheets of metal tiles is calculated by dividing the length of the eaves by the useful width of the sheet, and then rounding up the incomplete number.
Installation of metal roofing
A metal tile is a profiled sheet of galvanized steel with a polymer coating. This material is very popular.
A complete set of gutters, snow retainers and a security system will help create a functional, safe and harmonious roof.
When choosing a roofing material, attention should be paid to the following factors:
- type of coverage;
- steel thickness;
- range of accessories for roofing;
- thickness of the galvanized layer;
- color;
- manufacturer;
- guarantee period.
The roof can be made from:
- non-ferrous metals (copper, aluminum, titanium-zinc alloys);
- rolled or sheet steel;
- profiled sheet and its varieties that imitate metal tiles.
Metal roofing is used on houses that have a complex roof shape.
Laying a roof from a metal tile consists of several stages.
Installation is carried out in the following sequence:
- arrangement of the truss system and lathing;
- attic room;
- installation of vapor barrier and insulation;
- installation of a counter-lattice and waterproofing;
- intermediate crate;
- wind boards;
- coating of cornice overhangs made of metal;
- installation of wall gutters;
- roofing installation;
- groove cover;
- hanging gutters;
- coating on the facade of the building protruding parts and window sills.
In addition, additional metal roofing elements should be installed. These elements include various strips for closing the gaps between the joints on the roof.
These elements prevent water from entering the roof and give it a finished look. In addition, there are such types of additional elements for roofing:
a - ridge element; b - element with a semicircular profile for the ridge; in - end for the skate; g - butt for roofing sheets; d - element of the eaves; e - valley
Additional roof elements:
- ridge (semicircular, rectangular, narrow);
- a cap, which is an end element for a semicircular ridge;
- a wind bar covering the ends of the sheets of metal tiles;
- snow retainer;
- cornice is an element that protects the cornice board from water that flows down from the roof;
- adjoining to the wall - completely closes the gap at the junction of the roof.
How to calculate the truss system
Loads are constantly being placed on the rafter system, so it is necessary to calculate the truss system taking into account snow and wind loads.
The snow load is calculated using the formula S=Sg*µ. Sg - reflects the value of snow weight per m / 2 and is calculated based on a table that reflects the snow area. µ - is the coefficient of transition of the weight of snow to the load exerted on the roof, and depends on the slope of the roof slope:
- µ=1 if the slope angle does not exceed 25 degrees;
- µ=0.7 if the slope angle is from 25 to 60 degrees.
- In the event that the slope of the roof exceeds 60 degrees, then µ is not taken into account.
- Wind load is calculated using the formula W=Wo*k.
- Wo - is determined according to the table of wind regions of Russia.
- k is a coefficient depending on the type of terrain and the height of the building, and is taken from the table.
To calculate the angle of inclination, you need to consider:
- Construction weight.
- Snow load.
Take the weight of 1 m/2 of all roof layers and add up the values of all layers. Now multiply the result by 1.1.
Example:
The thickness of the crate is 2.5 cm, then m / 2 is equal to 15 kg.
The insulation has a thickness of 10 cm, then the weight will be 10 kg per 1 sq. m.
Metal tile - 3 kg per m / 2.
We consider 15 + 3 + 10 * 1.1 \u003d 30.8 kg.
Do not forget that when counting the section of the rafter leg, you need to add the weight of the rafter to the roofing carpet.
How to calculate the angle of the roof
When calculating the angle of inclination of the roof, wind and snow with rain should be taken into account.
In the event that strong wind loads are observed in the area, then it is better not to make the slope of the roof more than 20 degrees, with normal indicators - 35-40.
How to calculate the amount of metal tiles
First you need to measure the roof.In this case, special attention should be paid not to the area of \u200b\u200bthe roof, but to the size of each slope, since the metal tile must be overlapped, so if the roof is complex, then more material will be required.
Typically, the length of sheets of metal is 4 meters, and the useful width is 1.18 meters.
If the slope has a rectangular shape, then the calculation can be done in this way. For example, the height and width of the slope are 6 and 4 meters, respectively, then 6 * 4 and * by 1.1. We get 28.32 m / 2, which means that approximately 6 sheets of metal tiles will be required. In the same way, we calculate the remaining slopes.
In the event that the roof has a more complex geometry, then you will have to calculate each figure separately and add about 20 percent.
How to calculate the cost of a metal tile
For pitched roofs, a material such as metal tiles is the most common. It resembles a natural tile, but compares favorably in price with a clay counterpart.
The calculation of the cost of a roof made of metal is determined by the following components:
- the cost of roofing elements (heaters, types of insulation);
- the main cost is formed by additional elements and accessories (valleys, skates, gutters, gable trims, snow retainers);
- delivery of material, the cost of installation work - range from 40 to 100% of the cost of metal tiles.
The price per sheet may vary and it mainly depends on the standard sizes. Every roofer knows that it is extremely undesirable to change the size of the sheet by cutting, since there will be a high probability of violating the integrity of the polymer coating.
To do this, it is better to choose the standard sizes of individual sheets, which will have a minimum amount of waste when installing a roof made of metal.When it is required to lay a roof of a complex structure, it is necessary to make an individual order for sheets with the desired length, which will differ from standard sizes.
In addition, the cost of the material directly depends on the raw materials and the complexity of production. The highest quality material is made in Europe. And also the thickness of the sheet and the type of polymer coating also affect pricing.
Today, this material is represented on the construction market by a Finnish manufacturer, the cost for it is 15% higher than the domestic counterpart. If the price of this material is not high, it means that you are offered a material of very low quality, as the manufacturer saved on something.
Therefore, if the thickness is less than 0.4 mm and the zinc content is less than 275 grams, then this material will not last long on your roof.
For an approximate calculation, a metal roofing calculator is used. This service can be used directly on the website of the metal tile supplier, since only a leading specialist can correctly calculate the final cost of the roof. Therefore, the calculation takes into account the type of roof, the complexity of the shape of the roof, material, additional elements, accessories.
The complexity of the work to be performed is also assessed. The roofing materials calculator is designed to calculate the following roofs: mansard, shed, tent, four-pitched, half-hip. And you can also make the correct calculation of related roofing materials - screws, insulation, skates, hydrobarriers.
In addition, on our website you can learn how to properly install a metal roof: the instructions are given below.
Installation instructions for metal tiles
- The first step is to install the crate. Wooden battens of the battens are always mounted on top of the slats of the counter-lattice. It is recommended to use waterproofing, which can be used as an anti-condensate film.
- Next, the end plate is mounted on the roofing sheet using self-tapping screws, with a step of 40 cm, the overlap is 10 cm.
- At the highest point of the building, a ridge bar is mounted.
- Next, a cornice strip is mounted, which will reliably protect the crate from the effects of precipitation.
- Carry out the installation of roofing sheets.
- Then the sheets are attached to the crate using self-tapping screws.
- In places where one slope adjoins another, valleys and valley linings are installed.
- Next, mount the ridge bar.
- Install a snow guard.
- Use seals under the ridge.
Advice!
If you decide to do the roofing yourself, you can watch the installation of a metal roof - the video in this article.
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