What nails for slate is better to choose how many nails you

04-04-2018

Roof

Roofing materials fixed on the trunking of the truss system are subject to significant wind and snow loads. When using incorrect or poor quality fasteners, the roof may be deformed. Asbestos cement sheet is recommended to be fixed using special nails for slate, which are made taking into account the characteristics of the material and according to the requirements of GOST. In that article, we will describe how many fasteners you need to fix a sheet of asbestos cement, and how to choose the right size.

Device

Slate nails are roofing fasteners designed specifically to securely fix a sheet of asbestos cement on the roof surface. The material from which this type of fastener is made, and its structure ensures a strong attachment of slate to the wooden crate. Slate nails have the following device:

Leg. The leg is the long base of the fastener with a cap and a spike. It is made of low carbon steel and can withstand heavy loads. The length of the leg of the nails, which need to be fixed asbestos cement, is 9-12 cm.
The edge. The tip of the roof ends nail roof, the angle of sharpening is not more than 40 degrees. This element is necessary to make the fastener easier to enter asbestos cement without splitting it.
The hat. It is integral and consists of a washer and cap. The upper part of the cap, cap, crimped around the bottom washer. This design allows not to deform the sheet of roofing material during fastening. The large diameter of the cap, amounting to 12-16 mm, reliably isolates the hole from the penetration of atmospheric moisture.

Important! In order to firmly fix the slate sheet on the crate, you need to use high-quality fasteners of the right size. Roofing nails must be manufactured in accordance with the requirements of GOST 9870-61 or TU 208-81, PCT 1822-83.

Manufacturing process

Nails which need to be fixed slate are produced using the same technology as conventional construction. For the production of fasteners used low-carbon steel with high anti-corrosion properties and mechanical strength, in the form of a wire wound on the bay. The manufacturing process consists of the following steps:

The coils, on which the steel wire is wound, are inserted into the nailing apparatus, and then sent to the unwinding unit.
The workpiece enters the correct-roller mechanism, where the straightening of the wire.
In the working unit of the nailing apparatus, the wire is cut to a workpiece of a size corresponding to the length of the future nail.
The cap is produced by cold forging cold forming.
After that, almost finished nail falls into the receiving tray. According to the requirements of GOST, the angle of sharpening of the tip of the fastener should not exceed 40 degrees.
The final stage of manufacturing roofing fasteners - galvanizing. To protect the nail from corrosion, the steel is coated with a zinc layer. The minimum number of dives in copper sulphate, which twitches the nail head - 2 times, lasting at least 1 minute.

Experienced craftsmen, in order to fix the sheet of asbestos cement on a wooden crate, use “brushed” nails. Angular notches are applied on the leg of such fasteners. Pull the "pierced" nails impossible, you can only break. They are used to prevent strong wind gusts from tearing slate.

Standard sizes

Slate nails, with which the sheet of asbestos cement is attached to the wooden crate, are made according to GOST standard sizes. They are packaged in 5, 10 or 15 kg in cardboard boxes, and 25 and 30 kg in boxes made of wood. The number of fasteners in the package is determined by weight. For example, 1 thousand slate nails of the most purchased size 5x120 mm weigh 24.48 kg. The standard dimensions of fasteners, which need to be fixed asbestos cement sheet, consider:

4x90 mm.
4х100 мм.
4x120 mm.
4,5x120 mm.
5x120 mm.

Note! It is quite simple to calculate which fasteners are necessary to fix the roofing material to the batten. To do this, add the thickness of the batten and vapor barrier and the height of the crest of the slate wave, and then add 10 mm to the resulting number. The higher the waves of the roofing material, the longer you need to take nails.

Quantity calculation

It is usually calculated how many fasteners are required to fix the slate, at the stage of calculating the required amount of roofing material. The consumption of nails on 1 sheet is 10 pieces. If the number of attachment points is less, the roof may be deformed by the wind load. If you increase the consumption of nails, you can deform or split the sheet. To determine how much hardware is required for roofing, you need to:

Calculate the roof area. To do this, determine the area of the slopes and summarize them.
Calculate how much slate sheets are needed. To do this, the total area of the roof should be divided into the useful area of slate sheet.
Determine the required number of fasteners. To do this, you need to multiply the amount of roofing material by 10.
Determine the number of packages of nails. Knowing the weight of 1000 fasteners, you need to calculate the weight suitable for the package volume.

Note that the price of fasteners depends on the size, type and quality of the metal. Products with composite hats, which do not injure the roofing material, are more expensive than ordinary ones. Fully galvanized nails that do not corrode are expensive. The average price of 1 kg of slate nails is 130-150 rubles. But they can be purchased at a discount if you buy small wholesale.

Mounting method

Slate nails are the simplest fasteners that can be used to fasten an asbestos cement sheet to a wooden crate, only pliers and a hammer are required to work with them. The main difficulty that the master faces during installation is the fragility of slate. Damage to this roofing material can be just one wrong movement of the hammer. To avoid material damage, you need to follow the following rules:

Holes in the slate are pre-made with a drill. The diameter of the holes should be 1-2 mm larger than the size of the nails.
When fastening solid roofing materials, a nail is driven into the crest of a wave, and soft ones into a chute.
When fixing the slate, it is forbidden to bend the nails, as due to uneven thermal expansion of materials, rigid fixation is not allowed.
Nails are hammered at an angle of 90 degrees to the elements of the batten so that a gap of 1-2 mm remains between the head and the crest of the wave.
To prevent deformation of asbestos-cement and water flowing into the holes, you can use neoprene, rubber or slate pads.

Important! First, nails fix the edges of a sheet of slate, then the middle, and last of all all other areas. For fastening 1 sheet of roofing material at least 10 fasteners are used. However, overdoing the number of nails is also not worth it, since a large number of holes will increase the risk of leakage of the roof.

Comparison with screws

For mounting slate in addition to the roofing nails can be used special screws. They differ in that a screwdriver is used for their twisting, and also they do not make pre-holes. Self-tapping screws are better suited for soft, modern slate varieties. They have the following characteristics:

Screws for the roof are made of hardened steel, so they are stronger than slate or fable nails.
The choice of sizes of roofing screws is much more diverse than that of nails.
Roofing screws are made in a variety of colors, so they are suitable for color roofing.
Self-tapping screws with fasteners for a Phillips screwdriver or a wrench.
Some models of screws are supplied with a seal that protects the holes from the ingress of water.

The most important advantage of self-tapping screws is that they do not need to pre-produce holes, and, consequently, use a drill, which significantly speeds up the installation process.