Self-tapping screws for roofing work are analogous to metal screws, but have their own specific application. They differ in that in their design they are equipped with a sharpened and sharp sting designed for drilling a hole under fasteners immediately during installation without preliminary drilling with a separate tool on each of the fastened elements.
Content:
- Dimensions and weight ↓
- Application area ↓
- Views ↓
- For metal with a drill ↓
- By wood ↓
- Painted ↓
- For installation of corrugated board and sandwich panels ↓
- Roofing screws with a drill ↓
- How to choose? ↓
- How to fix it? ↓
- Advice ↓
Also, in their design, a washer is provided for tightly attracting the roofing material to the roof frame, which thanks to the rubber gasket, it effectively prevents the penetration of moisture into the area of direct docking details.
The head of the self-tapping screw has the shape of a hex washer of the usual size - M8, which allows you to use any screwdriver to screw it in, which comes with standard bits.
Dimensions and weight
The dimensions of the screws for mounting the roof in each case are selected depending on the characteristics of the materials that they will fasten:
- As a fastener for metal tiles products with a section of 4.8 millimeters are considered optimal, but their length varies depending on the place of installation. So, when mounted on a supporting frame, depending on which crate, the length of the self-tapping screw for reliable fastening should be from 28 to 35 mm for mounting on a wooden structure. The connection of the sheets can be made with 20 mm fasteners, and in order to fix the extension, you will need products from 50 to 70 mm long.
- For mounting corrugated board, due to its dimensions, self-tapping screws of a larger diameter may be required, for example, from 4.8 to 6.3 mm and with a rather wide range of lengths from 20 to 250 mm.
The weight of a thousand standard self-tapping screws with dimensions of 4.8 × 28 mm is approximately 5 kilograms.
The price range for roofing screws is wide enough. Their cost mainly depends on the brand of the enterprise, the quality of the product and its dimensions.
It is important to navigate the brands of trusted manufacturers, since an unknown company is unlikely to be able to offer products of sufficient quality. For example, now, the rational price for one self-tapping screw is 2 rubles.
Application area
Self-tapping screws for the roof, as you can decipher from their name, are used for roofing work. That is, works that provide for the consolidation of the most different roofing materials directly on building structures made of wood or metal.
As a rule, in most cases, it is on them that the corrugated board, sheets of metal or tiles are fixed on the lathing of the roof of the building. Unlike nails or screw fasteners, mounting on them provides an order of magnitude more resistant to stress connection.
They are made from steel with a high carbon content, as well as using a galvanized anti-corrosion coating.
Thus, carbon provides high fracture toughness, and zinc provides wear resistance under prolonged exposure to external environmental factors that cause corrosion of unprotected metal. Such characteristics ensure a long service life of such fasteners - up to 50 years.
Views
This fastener is used for the installation of metal corrugated board due to the through insulated fastening on the roof frames and metal walls.
The drill of such a self-tapping screw provides penetration of a sheet of metal up to 1.2 mm thick without the use of special tools, and with the use of tools for pre-drilling holes, in sheets up to 6 mm.
By wood
They are used when fastening various elements of wood. For better convenience, the tip of the fastener is equipped with a drill. With these fasteners, you can connect wood and metal profiles, if you make through holes in the iron profile using a drill in advance.
They are also equipped with a rubber gasket that serves as a waterproofing function in the joint area. As a rule, such products are manufactured in accordance with GOST using carbon-containing steel and are galvanized.
Painted
They have as their function the connection of painted metal roofing elements to the frame of the roof base made of metal or wood.
This type of fastener differs from the previous ones only in that it has a color similar to that of the metal profile fixed by it.
For installation of corrugated board and sandwich panels
Their use eliminates the need for pre-drilling the hole with a drill. They are easy to mount to supporting structures up to 12.5 mm thick. However, the corrugated board itself should not have a thickness of more than 1.5 mm.
To ensure maximum tightness, a rubber gasket is present at the point of contact with the metal. To create a more aesthetic look, it is best to use screws with a pre-applied polymer coating, which allows the screws to blend in with the general appearance of the roof covering.
Roofing screws with a drill
A distinctive feature of such a self-tapping screw is the boring end. It is intended for drilling through holes in metal corrugated board directly during the installation process, without the need to first prepare it using a separate drill.
Also, like other high-quality products, such a mount must necessarily be equipped with a metal washer with a rubber gasket that maximally seals the joint.
How to choose?
Today on the construction market there is a huge range of elements for roof installation to choose from. But not all products are of high quality and can serve for a long time and reliably.
When choosing self-tapping screws for the roof, you should not immediately buy the first products that come to your sight.
The first thing to be guided by when choosing is for what specific functions they are purchased, what is the specificity of the structures they fasten - made of metal, wood or combined.
Only after deciding on the type of the necessary self-tapping screw, you can begin to assess the quality of individual options.
Branded products are marked on the cap in the form of a stamp. In high-quality fasteners, the rubber gasket fits snugly against the metal washer. If the gasket is of a low grade, then it will collapse after a couple of seasons, the joint under the washer will begin to rust and, after rain, red streaks will remain on the roof of the building.
Now manufacturers of roofing tiles and corrugated board, caring about their image as suppliers of quality materials, include high-quality branded fasteners with roofing materials.
The self-tapping screw, although it is a small fastening element, performs a huge strategically important function, being responsible for the reliability of fastening the entire roof to the roof frame. It is from its compliance with the declared quality characteristics that the resistance of the roof to all the whims of bad weather will depend. Otherwise, it can "fly away" at the first storm warning.
How to fix it?
All sheets of metal tiles should be fixed to the roof lathing at the bottom of the sheet, since only there is a tight abutment of the washer with a rubber gasket to the sheet ensured. It is preferable to perform this work using special roofing screws for metal. They must be screwed in two centimeters below the so-called step, which plays the role of a landmark.
When tightening the fastening, a rubber gasket should, after being deformed, reliably hide any gap between the roofing material and the screw head.
Rubber made using vulcanization technology will ensure the tightness of the installation. Such work is performed with self-tapping screws with a length of at least 28 mm.
Advice
- For efficient installation work it is recommended to use an electric screwdriver with replaceable batteries.
- Professionals when choosing the optimal mounting length, a simple rule is used, according to which the length of the self-tapping screw should be three times the thickness of the material fixed by it. Thus, a 2/3 recess of the self-tapping screw necessary for a strong connection into the base is provided.
- Like any other consumable, they should be purchased with a margin, since there is not only a defect in the product itself, but also during installation.
- Depending on the type of lathing – metal profile or wood, choose self-tapping screws with a fine notch or with a large thread pitch.
- With a tightly compressed washer of a self-tapping pliers, neither paint nor rubber gasket should peel off, otherwise it is a low-quality product.
