The technique of fixing the corrugated board to the roof

Fixing of corrugated board with self-tapping screws to the roof takes place according to a special technology, due to what the constructed roof can last about 45 years.

More often the decision to choose as a roofing material of a corrugated board is explained by universal characteristics of a product.

Modern coating features good strength and a high level of resistance to climatic factors, respectively, the roof made with its use turns out to be reliable and durable.

In addition, the profiled sheets do not need regular staining, since they do not burn out under the sun.

. What kind of self-tapping screws are used to fix the corrugated board?

Roofing with profiled sheet is made using metal screws. By the way, such fasteners are used for fixing roofing metal.

At the same time, it is not important what kind of material the crate was made from for corrugated board, only high-quality screw screws are used for both wooden and metal frame structures.

They come with a rubber sealing element, as in the photo.

If during installation of a roof to use fasteners, not intended for fixing the profiled sheet, over time the fasteners will loosen up and be covered with a corrosive coating.

The last trouble can be avoided if in time and correctly seal the seal around the screw holes.

When installing the corrugated board on the roof, there is no need to pre-prepare the holes, since the fastening elements were prudently equipped with tips in the form of drills.

In this case, the place of fastenings get tight, thanks to the rubber seal, which is equipped with each screw.

As for the length of the fasteners, it can be different - from 19 mm to 250 mm with a diameter of 4.8 mm to 6.3 mm.

The optimum option for fixing the corrugated board to the roof can be considered a self-tapping screw 4.8x28 mm, as well as a screw with a length of 35 mm, 50 mm and 60 mm.

Ridge elements must be mounted using a screw with a length of 80 mm. In general, the length of the fastener should be greater than the total thickness of the sheet and the crate by 3 mm.

The heads of roofing screws must have bows with a height that would allow the self-tapping screw to be firmly and correctly fixed when screwing in a screwdriver bit.

Features of calculation of self-tapping screws for fastening of corrugated board

Calculation of self-tapping screws for fastening of a corrugated board can be made according to several schemes, unique and personal.

The calculation for the first technology is considered more simplified, since during the calculation the figures do not change.

With minimal wind loads, you can be sure that the corrugated sheet will not vibrate.

Therefore, when calculating the number of screws, use 4 pcs.fasteners per one square meter.

If strong and permanent loads are expected on the roof structure, a calculation is made based on the figure of 8 pieces.per one square meter.

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An example is the calculation of the number of self-tapping screws for mounting on a roof with a bevel area of ​​50 sq. M.m.

At the same time the house stands on a raised, open to the wind space.

When making calculations, it is necessary to take into account stable wind loads, as a result of which the performed calculations show that you need to use the maximum number of fasteners.

The output is as follows: 50 m 2 x 8 plus 5% equals 420 pieces of self-tapping screws. Where, 5% - is a deviation, without which calculation is not done.

Although the calculation of the number of fasteners and will be carried out correctly, when buying screws it is better to take them a little more.

Calculation of self-tapping screws for personal technology is much more difficult, since in calculating not only the load on the future roof, but also the features of the crate, the corrugated board and the purpose of the surface are taken into account.

For example, when assembling a sampling, the screws need to be twisted into a sheet between the waves, at 2-3 levels.

If heavy loads are expected, then it is recommended to tighten the screws for 2 pcs.in a sheet at each level between the waves.

If the roof fasteners are screwed into a sheet and the metal roof lath, then a distance of 500 mm is usually taken, the distance can be increased without the expected loads.

In general, each situation is studied individually, but more often the personal calculation method is used in special cases.

Rules for fixing the corrugated board on the roof of the

After considering the question of what kind of self-tapping screws are necessary for fixing the corrugated board on the roof, it is worth familiarizing yourself with the features of fixing the roofing material.

After all, the correct installation is the key to the reliability of the design.

First of all, it is necessary to take into account the future designation of the roof, as the arrangement of the roof with an attic floor, as in the photo, will differ from the installation of the roof for a residential object with a cold attic space.

Perhaps, you need to cover the garage or hosostroyka with profiled sheeting.

In any case, the design depends on the purpose of the object, the area, the number of layers of the roof, as well as the number of profiled and self-tapping screws.

In this case, the sheet used for fixing on the roof must have certain parameters.

As a rule, in order to equip the roof, a universal profiled sheet "H" is used, in this case the height and thickness of the corrugation is determined separately for each structure.

How to calculate how many and what kind of self-tapping screws are required for mounting the profiled sheet, we considered above.

In this case, it will be correct to use self-tapping screws with a rubber seal for a simple cloth, and for mounting the ends - with a tin seal.

Installation of sheet products starts from the bottom of the roof slope, with the sheet hanging slightly from the roof, which will protect the wall of the house from precipitation.

Screws are screwed exactly perpendicular to the roof surface. Profiles can be mounted on 3-4 in a block, which makes it possible to speed up the workflow.

Also, do not forget that the roof ridge should be fixed in the upper wave of the sheet, while the surface of the profiled sheet is mounted to the roof lath only between the waves.

Waterproofing and vapor barrier of roof

Correctly designed scheme of layers of steam and waterproofing of the roof gives its advantages.

Insulating materials laid between roofing products and crates, can protect the attic from moisture penetration.

Exclude the formation of condensate - such a nuisance arises from the difference in temperatures inside and outside.

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In this case, the condensate is a threat to the structure of the roof, causing its damage.

Depending on the functional purpose of the object, it is determined how many protective layers will be placed on the roof.

For example, for residential facilities, their number should be greater, because in addition to insulation and waterproofing, it is mandatory to fix the vapor barrier layer.

The vapor barrier is mounted under the insulation, in order to protect it from the steam emanating from the inside of the room.

Installation of the waterproofing layer under the corrugated board is carried out on top of the heater.

As a waterproof membrane membrane is used, the properties of this material can protect the thermal insulation from dampness.

If the waterproofing material is not laid under the corrugated board, the condensate in the form of moisture can not be removed from the roofing space, as a result of which the service life of the profiled sheets will be halved.

How to calculate the step of the battens for profiled sheeting?

Basically for residential objects the lath for the future roof made of corrugated board is made of wooden beams.

At the same time, the distance between the beams can be different, it all depends on how many degrees the slope of the roof slope has, and on the height of the sheet corrugation.

Basic rules and options for fixing the crate:

• If the angle of inclination of the bevels of the roof is more than 150, the crate is made in steps of 35 to 50 cm;
• If the slope of the bevels is less than 150, then the skeleton of the roofing crate under the corrugated board is performed as a continuous one. In this case, the product sheet must have a wave with a height of 20 mm. In this case, the fastening of the profiled sheets must be made overlapping up to 20 cm;
• If you take the slope of the roof slope to 150 and the profiled sheet with a wave height of 35 mm, the distance between the beams should be more than 30 cm. The material itself is laid with an overlap of 20 cm. The fixing of the profiled sheet with a wave height of 44 mm is carried out on a lath laid withstep from 50 cm;
• If the angle of inclination of the roof slopes is 200, the overlap size should be 10-15 cm with the step of the crate 30-40 cm;
• A small angle, for example up to 120, can have roofs of different designs. In the junctions of profiled sheets, it is necessary to apply silicone sealant, for strength it is possible to fix the structure with iron rivets.

Fixing of corrugated board is carried out correctly, but the roof is flowing

It happens that the fixing of profiled sheets on the roof was carried out correctly, but the roof is leaking. Such a nuisance can be caused due to incorrect cutting of the sheets.

It is recommended to adjust the profiled sheets to the required parameters using conventional or electric metal scissors. Thus it is better to cut oblique cuts with an electric jigsaw.

After cutting the edges of the materials, it is necessary to treat them with a waterproof sealing compound, which will eliminate the appearance of edge corrosion.

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When fastening the corrugated board to metal girders, holes for the screws are made beforehand.

Therefore, in order to avoid leaks, without fail, each of them must be treated with a sealant.

It is recommended to move on the roof in soft-soled shoes, because the workflow does not always mean that the roofer is only on the crate.

In addition, to avoid accidentally damaging the protective layer of the profiled sheets, they should not be put on tools, it is better to use special boxes for this purpose.

If, however, the protective sheet of the sheet has been damaged, the damaged areas must first be lubricated with an anti-corrosion agent, and a moisture resistant paint should be applied over it.

After 2-3 months after installation of the roofing from the corrugated board, it is recommended to re-tighten the fasteners.

This approach will eliminate the weakening of the fastening, which can occur due to sudden changes in air temperatures.