Sizes of the ondulin sheet and additional elements. The correct calculation for the roof, the advantages and disadvantages of the roofing material

Ondulin, or, as manufacturers and sellers call it, Euroslate is a type of roofing material used both for complete roof sheathing and for repair work. Seriously competes with corrugated board, metal tile and asbestos-cement slate. Developed 50 years ago in France by Onduline, today this material is produced by companies around the world. All of them are actually distributors of the French manufacturer.

If you are going to cover the roof with Euroslate - you need to calculate it correctly. To do this, you need to know the standard dimensions of the product, to understand such concepts as the total and usable area. There is nothing complicated here. After reading this article, you will learn how to independently calculate the required number of sheets for purchase.

Summary of the article:

Production technology

Ondulin is made from cellulose fibers, a safe and inexpensive raw material. Unlike ordinary slate, it does not contain asbestos fibers that are harmful to human health.

In production, the raw material is cleaned of impurities, mixed with water and chemicals. The finished substance, called pulp, is driven through a special conveyor with a press to remove moisture. A paint mixed with water-repellent resin is applied to the resulting web. This substance improves the waterproofing of the product.

Then the cloth is given a wavy shape, after which it is sent to the drying chamber. Here at a temperature of 270 degrees, it finally dries. Sheets are cut using the guillotine.

At the last stage, they are impregnated with molten bitumen, giving the product absolute waterproofness. This action does not spoil its appearance at all, as you can see if you look at the photo of the sheets of ondulin.

Features and Benefits

The growing popularity of ondulin is due to its characteristics, which in many respects are superior to other types of roofing. Among them:

high frost resistance. The material can withstand up to 25 times freezing and thawing;
aesthetic appearance;
ability to withstand high pressing loads (up to 300 kg / m2);
absolute water resistance, a guarantee for which manufacturers give from 10 to 15 years;
durability. With proper installation and operation, the euro slate lasts up to 50 years;
resistance to aggressive environment and chemicals, mechanical damage, biological safety;
low weight, not creating a large load on the supporting structure. A sheet of ondulin of standard sizes has a mass of about 6 kg, which means that per square meter of roofing accounts for no more than 3 kg;
ease of installation and handling. The product is cut with an ordinary hacksaw, bends freely along and across;
ability to withstand gusts of wind up to 190 km / h;
high level of sound absorption;
the possibility of using the product in cold weather up to -40 degrees, and in extreme heat (it calmly keeps the ambient temperature up to + 110 degrees).

Dimensions of Euro Slate and its additional elements

The dimensions of the ondulin sheet for the roof are standardized, but often differ from different manufacturers. Only the length of 200 cm and the thickness of 0.3 cm are the same. The French Onduline produces products with a width of 95 cm; Swiss Gutta - 87 cm, 95 cm and 106 cm; Belgian Aqualine - 92 cm, American Nuline - 122 cm.

The sheets have a common and usable area. The first parameter is the product of length and width.The second parameter is the same, taking into account the inlet, determined depending on the design features of the roof.

The additional elements also have a common and useful length: the ridge is 100 and 85 cm, respectively, the tongs are 110 and 95 cm, the valley is 100 and 85 cm. The exception is the eaves filler. It is characterized only by a total length of 8.5 cm. The covering apron is available in lengths of 94 cm and is capable of covering a surface with a width of up to 84.6 cm.

All of these dimensions have permissible errors equal to several millimeters up or down.

Correct calculation of the required number of sheets

To correctly calculate the required amount of material, you must first find out the area of the roof. The easiest way to do this is on simple gable roofs, in which the slopes are rectangles. In the case of a complex roof, its surface must be divided into planes, calculate the area of each separately, and then fold them.

Consider, if necessary, the location in the roof of windows, ventilation and other elements. Remember that measurements need to be made on overhangs of eaves, but not on walls.

The obtained value should be divided by the useful area of the ondulin sheet. You can recognize it by making calculations in accordance with the following rules:

If the angle of inclination of the roof does not exceed 15 degrees, the size of the overlap should be 30 cm. The overlap is done in 2 waves. At large angles - from 15 to 20 cm, overlays on a single wave.

If the roof structure is complex, and the slopes of the ramps differ, the size of the overlap on each of them must be calculated separately.

For a better understanding we give an example. The working size of the Euro slate sheet is 200 x 95 cm. The total area in this case is 1.9 m2. On a surface with an inclination angle of less than 15 degrees, the useful length of such a product will be 170 cm, width - 65 cm. The useful area is 1.1 m2. At large angles of inclination, these values will be respectively 185 cm, 80 cm and 1.5 m2.

Calculation of the ondulin smart sheet is also performed, but with some reservations. Its distinctive feature is the special Smart Lock docking system. There are two extruded strips on the edge part, the product is 95 cm wide and 195 cm long. This greatly simplifies installation and increases the usable area. The overlap here is sufficient in the amount of 12 cm.

At the end of the calculations, you will receive the necessary number of sheets for purchase. In the case of a simple roof, 10% of the reserve must be added to it, if on the roof there are many transitions and corners - 20%.

Proper calculation of the roof in accordance with the recommendations given will help you avoid problems that inevitably arise when there is a lack of material. This includes additional costs associated with the purchase and delivery, and the differences of the new batch from the existing one in shade, which significantly worsens the appearance of the finished roof. With a serious and careful approach, these troubles will not arise.