The purpose of the article is to bring all the necessary and useful information about the dimensions of metal roofing to potential buyers of this product. After reading the article you will be guided in the modifications of this roofing material offered in the market (regarding the sizes of sheets). This will make the best choice when purchasing a roofing material and save money on the arrangement of the roof without sacrificing quality and performance.
Considering such the question of how the size of a sheet of metal roofing is initially necessary to determine which parameters are important for the consumer. Specialists identify the following:
length and width ;
wave geometry .
Almost all geometrical dimensions, except for thickness, have a direct impact on the most important from the point of view of costs, the parameter of the product - the usable area. This size metal roof allows you to determine the required number of sheets. The thickness of the sheets determines the requirements for supporting structures and the strength properties of the material. The thicker the sheet, the more massive the supporting structures should be, but at the same time the roof will be able to withstand heavy loads and be used longer. This is especially important for regions with high rainfall in winter.
When choose the size of metal tile for the roof, the length and width are the first things to notice. They are the ones most influencing the usable area of metal sheets.
According to GOST, the length can be from 50 to 900 cm. However, products of great length are rarely used directly in construction, they are purchased for cutting sheets of the desired length. The length of the metal tile is classified into the following groups:
supersmall - 50 cm;
small - 120 cm;
average - 225 cm;
large - 360 cm;
extra-large - 450 cm.
Almost all of the roofing products offered today on the building materials market have a length approximately equal to above figures. Different manufacturers may differ slightly (in the range of plus / minus 3 cm). Also, in a number of companies selling metal tiles, the service of cutting sheets of a certain length required by a specific customer is offered. Experts consider the use of 4-meter-long sheets as the best solution in terms of efficiency and labor costs for transportation, warehousing and installation.
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The total width of the metal tile for the roof is from 116 to 119 cm, while the working width of the metal tile for the roof is 110 cm. Such a small variation in the width of the sheets is due to the peculiarities of the manufacture of the profiled product. Sheets are produced on rolling mills, which in turn have standard roll sizes.
The step of a wave is the shortest distance between the two highest crests of neighboring waves, and its height is the distance from the lowest point of the wave to the top on the crest (along a conditional perpendicular line) . As a rule, manufacturers offer a metal tile on the roof, with a step size of 185 mm or 350 mm. The height of the wave products roofing metal is divided into such products:
with low typical wave height - from 20 to 30 mm;
average typical wave height - from 30 to 50 mm;
large typical wave height - from 50 to 70 mm.
In addition, the sheets have not just a wavy shape, but a stepped one. The usual step length is 35 cm, height - 15 mm.
The thickness of the metal tile is not the thickness of the product in general, and its metal base. This indicator directly affects the performance properties of the roof of metal sheets. Most products have a thickness of 0.4 to 0.6 millimeters. If it is less, then it speaks of excessive economy of the manufacturer and it is better not to purchase such products.
The best option for residential buildings in terms of price / quality ratio is 0.5 mm metal shingles and 0.4 to 0.5 mm for utility buildings.Metal products with a base thickness of 0.6 to 0.8 mm are usually in the premium segment and are more expensive. The total thickness of the product depends on the thickness of the decorative and protective layers that cover the metal.
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To prevent leakage from rain or snow, the sheets of metal tile are placed on the roof not over the edge but overlapping. If you take away the overlap, you can determine the useful area of the sheet on a metal base. The total overlap in the longitudinal direction is usually from 10 to 15 centimeters, in width it reduces the width of the sheet to 110 centimeters.
Due to the fact that the width of the sheets is almost constant for all similar products, when choosing products it is necessary to build on their length and thickness:
the longer and thicker the sheet , the more massive the supporting structure is needed for their installation;
the more weight a square meter of roofing sheet, the longer it will last and less rice and damage to the roof due to snow and ice;
fewer sheets with the same roof area of a simple form will save on installation costs, provided that for lifting too large sheets do not need special equipment;
if the shape of the roof is complex , then the length of the elements should allow its arrangement without unnecessary waste (possibly purchase sheets of different lengths).
You can find out from the video why it’s important correctly choose the length of the tile:
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As can be seen from the article, there are not many geometrical parameters by which to choose metal roofing. Therefore, in order to correctly choose the size of the roofing sheet, theoretical knowledge will be enough. But to make the best choice in terms of the cost of installation and operation, it is better to turn to professional practitioners.
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