The number of roofing materials on the market is increasing every year, technologies are becoming more perfect and the list of competitors is growing. However, some materials will be in demand today and tomorrow, and always, regardless of the surrounding conditions. There are many such roofing materials, and slate occupies a prominent place among them.
For many decades, slate has been successfully competing on market with other materials and has the following advantages: the price of slate is low, it is easy to use and very reliable. If you choose it for the roof, then thanks to its size, it will be easier for you to perform the installation with high quality, without creating any special difficulties.
What in our country is called slate is not at all. In fact, "slate" is the German word for "slate"; by the way, it is also used for roofing. But the material that we actually call slate: asbestos-cement corrugated sheet.
It is customary to distinguish 2 types slate: flat and wavy. Wave slate is divided into several more subgroups: five-, six-, seven- and eight-wave.
Flat slate is not the best option for roofs, but much more suitable for cladding walls and partitions of outbuildings. Corrugated slate is made in accordance with GOST 30340-95, and the main dimensions of the slate sheet are named: its width and length, thickness, distance between the crests of adjacent waves (it is also called wave step) and the height of the wave crests.
GOST provides only 2 brands of wave slate:
Slate can be distinguished not only waves, but also by the size of the profile. And so, types: the first type is HC, that is, a unified profile. Its main advantage is that there is the least amount of waste after its use. It is this type of slate that is often used for roofing residential buildings. Its dimensions (width-height): 1.
125 m - 1.75 m. The second option is labeled with the abbreviation VO, that is, ordinary. Its dimensions are 0.68 by 1.
12 meters. The third - VU, reinforced profile. Its scope is mainly for industrial facilities. And it has dimensions 1x2.8 m.
Now let's dwell in more detail on sizes 7 and 8 of wave slate. It is these types, as experience shows, that are most optimal for DIY construction.
These brands are purchased most often for building the roof of a summer cottage or small houses. The most important thing in them is that the difference between the effective sheet area and the actual is quite small. It's all about the standard overlap, which is 1-2 waves, which is slightly relative to the overall size.
By the way, it is necessary to remember that the waves located at the edges are slightly different in size from those in the center.
The height of the ridges of both the 7th wave slate and the 8th one is 4 cm, and the distance between the waves is 15 cm. But the thickness can vary from 5.2 cm to 5.8.
These are the parameters that must always comply with GOST, everything else can be changed.
So, the size of 7 wave slate:
Sizes of 8 wave slate sheet:
5 and 6 wave slate is commonly used in manufacturing. These types of slate most often cover premises that are used for production needs, such as warehouses. They are not very profitable for private construction. This is because the size of an 8 wave is the same as a slate with five waves.
And in fact, the difference in overlap between usable and actual area is prohibitively large. The end result is an incredible cost overrun.
This type of slate is 7.5 mm thick. Thicker slate does not break so quickly on impact and less brittle when bent.
Moreover, slate of this thickness is able to withstand temperatures two times lower than thin slate.
Size 6 wave slate is slightly different (length-width-height): 1.75m-1.125m-20 cm.
Among the disadvantages of wave slate can be distinguished: the most important thing is fragility.
Unfortunately, even from large hail, holes can form in the slate sheets, which will render the roofing material unusable. In addition, each slate sheet has a considerable weight - from 14 to 16 kg, which greatly complicates the installation of the roof.
Asbestos fibers have bad properties, which can swell due to high humidity. In cases where the angle of inclination of the roof is less than 12 degrees, moisture can collect between the sheets, moss appears, and in severe frost, the sheets can crack.
Therefore, we must not forget that the greater the slope of the roof, the longer the slate will last.
Asbestos itself is quite harmful to the environment. Also, a rather short service life will be an undoubted drawback. In most cases, the manufacturer's warranty is only given for 30 years. Slate has a habit of losing its properties every year.
We've talked enough about the disadvantages, now let's turn to the advantages.
Firstly, the price of a sheet of wave slate, in comparison with other materials, will pleasantly surprise you.Slate is perfectly cut by almost every cutting tool, be it a saw, grinder, circular saw or something else. Corrugated slate is easy to install. To fix it, it is not necessary to have a special construction education - you just need to study the instructions.
Everything discussed above applies to wavy slate.
But it would be a mistake to forget about the kind of slate as flat. It is not suitable for roofing, but it is very good in cladding. The thickness of sheets can be up to 20 millimeters, starting from 8. Flat slate can be of different sizes (length-width in meters):
The most popular sheets are 1.
75x1.13 m. Most often they are used with a thickness of 10mm. The weight of such a sheet of flat slate will be 40.1 kilograms.
For a thickness of 8 mm - 30.5 kg, for 6 mm - 21.2 kg, etc.
To calculate the required amount of slate for a roof, you just need to measure the length of the roof and subtract the width of the sheet from it. In this case, we subtract 0.
1 per overlap and get the required number of slate sheets per row.
The number of rows is calculated by dividing the distance from the base of the ridge to the lower overhang of the roof and add 13% to the overlap. If you get a fractional number, then you can round.
And the last piece of advice: it's better to buy one pair of sheets more than you expected - just in case.
( 1 grade, average 4 of 5 )
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