Minimum roof slope from the profiled sheet: allowable parameters, calculation features and recommendations

Due to its excellent performance characteristics, the profiled sheet has been widely used both in residential and industrial construction. If all the installation techniques are followed with its use, a reliable, durable and aesthetically attractive roof cover can be made.

Manufacturer's recommendations: minimum roof slope from the profiled sheet

In most cases, this material is recommended to be laid on roofs with an angle of inclination of at least 20 degrees. This rule, however, applies mainly to residential buildings. In industrial building regulations, it is allowed to use profiled sheet as a roofing material for ramps with an inclination angle of 8 degrees. But on very sloping roofs of production buildings, you can mount only a special sheet - with a self-supporting profile. Although this material is quite expensive, it is sometimes used in private housing construction. With its application, the minimum slope of the roof of a residential house from the profiled sheet can be equal to 15 degrees.

Consequences of non-compliance with regulations

If the requirements of SNiP concerning the minimum allowable angle of slope of skates are violated during the design of the profiled roof, the owner of the house will subsequently face such problems as:

• Leakage during rain through self-tapping holes;
• The penetration of the roof by layers of snow;
• Too much heat loss through the roof;
• Break sheets with strong gusts of wind.

Many owners of suburban real estate believe that the more hollow the roof, the less material is left for it. But in fact, this is not entirely true. When arranging a sloping roof, you usually have to use a very large number of rafter legs (40 cm pitch). In addition, in this case, the sheathing material, according to the standards, is stacked with a significant overlap.

The minimum slope of the roof from the profiled sheet, as we found out, is 15 degrees. When designing, you can choose such a variant of the roof. But it is better to make the roof slopes more abruptly. In this case, and the skin will be more reliable, and the work itself will be easier to install the material. The optimum version of the angle of inclination of skates when using a profiled sheet is 25-40 cm.

What should be an overlap

This indicator, therefore, depends on the angle of inclination of the skates chosen at the design of the house. So:

• For an angle of 15 to 30 degrees, the overlap should be 20 cm;
• For roofs with an angle of 30 degrees or more - 15 cm.

If the project has a minimal roof slope, the lining is made from the profiled sheet with overlap between rows in two waves. In this case, for additional protection against moisture penetration, a sealant and a special sealant are used. Among other things, in this case, under the profiled sheet, a continuous crate must be packed.

Recommendations for material selection

The modern industry produces profiled sheets of two main varieties: wall (marked "C") and proper roofing ("K"). Also, this material can vary in profile shape. Of course, for the roof should be used is the roofing sheet. With regard to the profile, in this regard, for the trimming of the rafter system, the variants "wave" or "trapezium" with a height of 25-31 mm are usually used.

The optimum thickness of the sheet for the roof is 0.8 mm. Sometimes, for roofing, the option is also chosen for 1 mm. Such a thick material is usually acquired if the minimum roof slope from the proflist is chosen. In degrees, as we found out, this parameter is eight to fifteen. In centimeters it will be expressed first of all in the height of the ridge. The wider the opening, the greater this figure will be.

For a very large area, it is necessary to use two or three rows of sheets. However, more often the roof is designed in such a way that it can be sewn in one row. Therefore, when selecting materials, you should pay attention, including its length. Most often on sale there is a profiled sheet at 6 m. Therefore, it is possible, and to design a roof is just under that length.

How to calculate the amount of material necessary for the roofing of the roof

The roof project should include not only its own drawings, but also an estimate with all forthcoming costs. Calculate the amount of necessary roofing material is not so difficult. For this, the roof area should be simply divided into the area of one sheet. In this case, of course, you should take into account the overlaps. The minimum slope of the roof from the profiled sheet according to SNiP is 8-15 degrees. For such a shallow roof, the overlap, as already mentioned, will be 20 cm. That is, from the total area of each sheet in this case it is necessary to take away just 20 cm.

To buy materials should be a small margin. After all, during the installation, some sheets may be damaged. The same applies to additional elements. This is especially true for the case when the minimum roof slope is chosen from the corrugated board. In this case, the permissible parameters (8-15 °) must be observed. But in any case, sheathed roofing will be somewhat more difficult than steep, because during this procedure, among other things, you have to work with seals or sealant.

Stacking order

Begin the installation of the profiled sheet from the bottom edge of the roof. Mounting is done on self-tapping screws with special seals. The latter are fixed in the bends of the proflist waves. Before laying the actual material itself, a curtain rod, a drain, a chimney waterproofing and, if necessary, a lower bracket of valleys are mounted.

The sheets themselves are fixed in blocks. That is, first on the crate at the ridge on the screw is fixed first. Why is the second sheet attached in the same way? Further it is fixed by screws to the first. Similarly, the third sheet is mounted. Then the whole block is completely leveled over the cornice and fixed permanently.

At the final stage of the roofing, a horse, raincoats, end plates and an apron of the pipe are mounted. If necessary, snow holders are installed.

Some recommendations for installation

To raise profillist on the roof you need one at a time. The metal shavings that appear when the screws are screwed in should be immediately swept off with a brush. Otherwise, the polymer layer may be damaged, which will shorten the life of the roof. Walk on the roof during the work should be in shoes with soft soles. If during installation the polymer layer of profiled sheets will still be scratched, the damaged areas should be immediately treated with a special compound. The minimum slope of the coating from the self-supporting corrugated board is 8 degrees. For such a shallow roof, compliance with the above recommendations is particularly relevant. After all, with a small slope on the roof will have more than a serious load.

Fasten the sheets to the crate only with the use of special screws with a gasket. Use rivets or nails for this purpose can not. Screws should not be screwed too tightly.

Instead of concluding

Thus, we have found out what is the minimum deviation of the roof from the profiled sheet. Calculation of the design of such a roof is best done taking into account the length and width of the sheet. In this case, the material does not have to be cut. And consequently, in the end there will be less waste, and the roof itself will be much more reliable and durable.