If you are engaged in construction and dream of building your dream house on your own, so that it will serve for more than one generation, then you need to approach the choice of materials with all responsibility. There are no minor details when building a house. In our article we will talk about how important self-tapping screws are for metal tiles.
There is an opinion that do-it-yourself roofing it will last as long as the shortest of its components lasts.
This also applies to self-tapping screws. It would seem that such a small material, well, how can it affect the quality of the roof? In fact, it can very well.
And it all depends on its quality and quantity, so it is important to calculate the amount when calculation of metal tiles.
Distinctive features of self-tapping screws for roofing
Self-tapping screws for metal roofing differ from ordinary self-tapping screws in that they have a special washer that has a seal.
In accordance with the expected structural load, self-tapping screws are divided into two categories:
- Metal-metal.
- Wood-metal.
Important: we do not recommend neglecting such a classification of self-tapping screws and using them strictly for their intended purpose.
Many may counter that the washers of the self-tapping screws will stand out on the roofing material, which will not add aesthetics to the roof.
We hasten to assure you that today on the market you can easily pick up any color of self-tapping screws that exactly matches metal tile color.
Therefore, the use of self-tapping screws will not affect the aesthetics of the roofing.
The main function of self-tapping screws is to ensure tightness during the installation of roofing.
In order for the tightness to be really high, you need to purchase high-quality self-tapping screws; the manufacturer usually indicates a special marking on their cap.
It also indicates the type of screw.
In order for a self-tapping screw to perform its function at 100%, it must be made of high-quality high-carbon or stainless steel. Also, the self-tapping screw must have an additional anti-corrosion stainless coating.
It is important to know: using high-quality self-tapping screws, you will protect the metal tile attachment points from possible corrosion and rust smudges.
An equally important component of high-quality self-tapping screws is its sealant - a rubber washer.Manufacturers with a positive image make such a washer from special EPDM rubber.
It has increased resistance to changes and temperature changes, and also has increased elasticity properties.
A word of advice: when buying a self-tapping screw, do not hesitate to check its quality. To do this, check the tightness of the rubber washer to the metal one. Don't buy self-tapping screws where the rubber washer comes off easily. Subsequently, operation is fraught with the destruction of the gum, respectively, water will enter the attachment point, and rusty smudges will form, and over time, local corrosion.
How to distinguish a high-quality self-tapping screw or a low-quality one? Squeeze the washer with pliers. If the self-tapping screw is of dubious quality, then its painted surface will burst.
Manufacturers who value their name and reputation strictly test and control their products under a number of loads.
So, self-tapping screws are tested according to several parameters:
- Create a load by tilting the self-tapping screw by 5 degrees. At the same time, it must withstand 20,000 vibrations.
- When tilted by 10 degrees, the self-tapping screw must withstand 2000 vibrations.
- A 15 degree tilt suggests the ability to withstand 100 swings.
A high-quality self-tapping screw with dignity withstands all tests, while the quality of its steel does not change.
Recently, many branded manufacturers of metal tiles have also supplied self-tapping screws in the kit. Only the use of original screws entitles you to the manufacturer's warranty. A roof made of metal, on average, should last 50 years or more.
Calculation of the required number of self-tapping screws for the roof
Many developers are interested in the question: how many self-tapping screws per sheet of metal tiles should be used so that its fastening is as reliable as possible?
Most experts are unanimous in their opinion: 8 to 10 pieces of self-tapping screws should be used per 1 square meter of metal roofing.
This number refers to standard sheets. In places of complex geometry on the roof, an additional number of roofing accessories, as well as depending on the thickness of the metal and the pitch of its runs, this number varies.
It is important to know: roofing materials must be fastened to a wooden crate with wood-metal self-tapping screws with dimensions of 4.8x35.
How to fasten self-tapping screws
Each lower edge of the metal tile sheet must be fixed with self-tapping screws through the wave into its sole. All subsequent rows of self-tapping screws can be recommended to be screwed in a checkerboard pattern through one wave.
Important to know: fix the side overlap of the metal tile sheet with self-tapping screws along the crest from each wave. Fix the end plate with self-tapping screws in increments of 500-600 mm. Fix the ridge strip with special ridge screws through one wave in the metal tile sheet.
The consumption of self-tapping screws for metal tiles can be calculated after the roof project has been completed, the dimensions and quantity of the roofing material are known, and the complex geometric and design features of the roof are taken into account.
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