Calculation of ondulin and its installation

In construction of any type, the correct calculation of materials leads to financial savings. The same thing happens with the arrangement of the roof. The calculation of ondulin is made taking into account the dimensions of the roofing sheets and the surface area of ​​the roof. From this article you can learn the detailed calculation technique.

The main properties of ondulin

Before calculating ondulin, let's dwell a little on what this roofing material is.

Ondulin is a soft roof covering based on cellulose, which is subject to pressing and impregnation with bitumen, followed by the application of resins and mineral dyes.

The popularity of ondulin is due to:

• low price;
• ease of installation;
• high technical properties.

Ondulin has the following advantages:

• 1. Coverage reliability. The material impregnated with bitumen practically does not absorb water, which provides the roof with waterproofing.
  2. The breadth of the temperature range. Ondulin can be used in countries with different climates, as it can withstand temperatures from -40 to +80 degrees.
  3. Strength. The material is resistant to snow loads and hurricane winds.
  4. Noise isolation. Due to its composition, ondulin absorbs noise.
  5. Practicality. This coating is flexible, so it can be used on both simple and complex roofs.

Features of the calculation of the material

To calculate the amount of ondulin, you need to know its basic geometric parameters. The area of ​​a sheet measuring 0.95x2.0 m is 1.9 sq.m.

Important in the calculation of the material is the indicator of calculating the area of ​​\u200b\u200bthe roof.

If you carry out calculations at the construction design stage, then the calculation of the roof area can be carried out according to its projection. In this case, knowledge of geometry will come in handy:

1. The roof surface is divided into geometric objects (trapezoid, triangle).
2. The area of ​​each element is calculated using mathematical formulas.
3. Further, it must be taken into account that the roof has a certain slope, that is, the angle of inclination of each geometric object relative to the ground.
4. All indicators are summarized. As a result, you get the roof area.

This we talked about a more time-consuming method of calculation.

In general, if the projection of the roof is represented by a rectangle, and roof pitch equal to 30 degrees, then the area of ​​​​the roof is determined by multiplying the cosine of the angle of inclination by the area of ​​\u200b\u200bthe rectangle.

Having the value of the roof area, you can easily calculate the number of ondulin sheets. To do this, it is necessary to divide the indicator of the roof area by the useful area of ​​\u200b\u200bthe roofing sheet.

Note that the useful area of ​​​​ondulin depends on the slope of the slope and can be 1.3; 1.5; 1.6 sq.m.

Attention. The calculation of the surface area of ​​the roof is made according to the eaves overhangs, and not along the extreme lines of the structure.

Technique for calculating the material for a conventional roof

Let's return to the technique itself: ondulin - how to calculate. When calculating the material for the roof, the following points must be taken into account:

1. Sheet size. As we said above, the length of the sheet is 2 m, the width is 0.95 m. The standard issue is a ten-wave sheet;
2. The size of the releases. When arranging a roof with a different angle of inclination, overlaps of different sizes are carried out. As a rule, they exceed 15 cm. If the roof slope is 10 degrees, then the size of the overlap is 30 cm (along the continuous crate). When the angle of inclination exceeds 15 degrees, an overlap is made from 15 to 20 cm;
3. The size of the side laps. Again, depending on the slope of the slope during installation, the overlap can be 1 or 2 waves (an angle of inclination of 10 degrees - an overlap of 2 waves, an angle of inclination above 15 degrees - an overlap of one wave).

When buying ondulin, one should not forget that overlaps reduce the length and width of the sheet (usable area), so the size of the overlap should be taken into account.

The useful area of ​​one sheet is 1.92 sq.m. On a flat roof, the overlap will go up to 30 cm from all sides.

Thus, the net length will be 1.85 cm, and the width will be 0.86 cm. This means that the usable area will decrease from 1.92 sq.m to 1.6 sq.m. As a result, when buying, it is necessary to increase the number of sheets.

There are many programs for making calculations. Basically, they are used in their work by professional builders.

Advice. Considering all dimensions, ondulin should be carried out - a calculation with a margin of material (10-15% on a simple roof, 15-20% if there are many transitions and corners on the roof).

Installation instructions

If you figured out how to calculate ondulin, then stop your attention on some points of its installation. Ondulin is laid, as well as installation of conventional slate:

1. Carry out the installation roof battens, taking into account the slope of the slope and the direction of the wind. Work is recommended to start from the leeward side. The bars of the crate are located at the same distance. With a roof slope of 20 degrees, the distance between the bars is 600-800mm. In case of increasing the distance, additional rails are installed;

2. The first row of ondulin is laid from the lower right corner. For the second row, it is necessary to make a longitudinal cut on the sheet and start laying from half of the sheet;

   

3. Foxes are fastened horizontally with special nails (20 pieces per sheet). The first row of fasteners is placed in each wave. Subsequent fastening - in every second crest of the wave. When installing the second row, an overlap of the required size is made on the first row;
4. In the vertical direction, the sheets are attached to the bar. The longitudinal overlap must be at least 1 wave, and the transverse overlap must be at least 15 cm;

5. The installation of ridge elements completes the work of laying ondulin. They are mounted with an overlap and fastened along the ridge of the sheet. On gable roofs, corner ridge elements are used;

6. To equip the valley with ondulin, it is necessary to mount an additional crate.

For high-quality installation of the roof with ondulin, additional roofing accessories are produced for this material:

6. • ridge elements;
   • nails;
   • valley;
   • ventilation tube;
   • cornice filler;
   • pincer element;
   • self-adhesive sealing tape.

It is not difficult to calculate ondulin and install it. But, if you have doubts about the correct understanding of working with this material, then seek help from experienced roofers.

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