home · Measurements · How to properly measure a roof for metal tiles. Calculation of roof square footage or how to calculate roof area using an online calculator. How to calculate the area of ​​a gable roof

How to properly measure a roof for metal tiles. Calculation of roof square footage or how to calculate roof area using an online calculator. How to calculate the area of ​​a gable roof

Construction of any kind is impossible without preliminary calculations, therefore by this preparatory stage should not be neglected under any circumstances. You need to calculate the parameters of the roof itself, its angle of inclination and other aspects, as well as the amount of roofing material that will be required for the surface of the entire roof. We will tell you how to do this in this article.

The calculation of the roof area depends on the type of roof itself. If the roof is simple, i.e. single-slope, then there should not be any special problems in the calculations. But there are other cases when there are certain difficulties in this matter.

Any construction is a rather expensive undertaking, so the owner is glad of any opportunity to save money somehow.

Determining the roof area involves quite a lot of calculations, including finding the height, angle of inclination of the roof, as well as the volume of technical equipment. building materials, which are necessary for the construction of the roof. If everything is done correctly, then you will not have to overpay for building materials by buying more than you need, and you will also save on transporting the material to the construction site.

The complexity of the calculation will directly depend on the type of roof used, of which there are a sufficient number.

Designation of fields in the calculator

Specify roofing material:

Select a material from the list -- Slate (corrugated asbestos cement sheets): Medium profile (11 kg/m2) Slate (corrugated asbestos cement sheets): Reinforced profile (13 kg/m2) Corrugated cellulose-bitumen sheets (6 kg/m2) Bitumen (soft , flexible) tiles (15 kg/m2) Galvanized sheet (6.5 kg/m2) Sheet steel (8 kg/m2) Ceramic tiles(50 kg/m2) Cement-sand tiles(70 kg/m2) Metal tiles, corrugated sheets (5 kg/m2) Keramoplast (5.5 kg/m2) Seam roofing (6 kg/m2) Polymer-sand tiles (25 kg/m2) Ondulin (Euro slate) (4 kg/m2) m2) Composite tiles (7 kg/m2) Natural slate (40 kg/m2) Specify the weight of 1 square meter of covering (? kg/m2)

kg/m2

Enter the roof parameters (photo above):

Base width A (cm)

Base length D (cm)

Lifting height B (cm)

Length of side overhangs C (cm)

Front and rear overhang length E (cm)

Rafters:

Rafter pitch (cm)

Type of wood for rafters (cm)

Working area of ​​the side rafter (optional) (cm)

Lathing calculation:

Sheathing board width (cm)

Sheathing board thickness (cm)

Distance between sheathing boards
F (cm)

Calculation snow load(pictured below):

Select your region

1 (80/56 kg/m2) 2 (120/84 kg/m2) 3 (180/126 kg/m2) 4 (240/168 kg/m2) 5 (320/224 kg/m2) 6 ​​(400/280 kg/m2) 7 (480/336 kg/m2) 8 (560/392 kg/m2)

Wind load calculation:

Ia I II III IV V VI VII

Height to the ridge of the building

5 m from 5 m to 10 m from 10 m

Terrain type

Open area Closed area Urban areas

Calculation results

Roof angle: 0 degrees.

The angle of inclination is suitable for this material.

It is advisable to increase the angle of inclination for this material!

It is advisable to reduce the angle of inclination for this material!

Roof surface area: 0 m2.

Approximate weight of roofing material: 0 kg.

Number of rolls insulating material with 10% overlap (1x15 m): 0 rolls.

Rafters:

Stress on rafter system: 0 kg/m2.

Rafter length: 0 cm

Number of rafters: 0 pcs.

Lathing:

Number of rows of sheathing (for the entire roof): 0 rows.

Uniform distance between sheathing boards: 0 cm

Number of sheathing boards with a standard length of 6 meters: 0 pcs.

Volume of sheathing boards: 0 m3.

Approximate weight of sheathing boards: 0 kg.

Field decoding

The most popular types of roofs

The construction of a roof is a rather complex process in which it is necessary to take into account not only the roofing material, but also. You also need to decide on the type of roof. So, Builders distinguish several types of roofing:

  • (hip);
  • multi-slope;

If the roof is of a fairly simple shape, without unnecessary kinks, then calculating its area will not be difficult. If the roof has a more complex configuration, with many slopes, then you will have to arm yourself with all your knowledge of geometry. This is explained by the fact that we will have to calculate the parameters of the geometric shapes included in the conventional roof pattern, and the difficulty will lie in the type of these same shapes.

Types of roofs

In most cases, the roofs of private buildings are as follows: geometric shapes. The area of ​​pitched roofs is calculated using these formulas:

  1. Trapezoid. Calculation formula (A+B)*H/2.
  2. Rectangle - A*B.
  3. Parallelogram - A*H.
  4. Triangle with equal sides— (A*H)/2.

NOTE!

It is worth understanding that the more complex the roof, i.e. if it consists of several slopes, the more difficult it is to build, as well as in other aspects - insulation, maintenance, etc. Financial issue also, no one has canceled it, because such a roof will require more building materials.

Shed roof area

Calculating the area of ​​a pitched roof seems to be the simplest, because it does not require a detailed roof plan.

It is calculated using a very simple formula:

S=A*B, Where

S- this is the area of ​​the roof itself (in this case, a rectangle).

A- this is the width of the roof.

B- this is the length.

Let's say the length is one pitched roof is 7 meters, and the width is 4. We calculate:

S = 4 * 7 = 28 meters.

Designations have been changed

How to calculate the area of ​​a gable roof?

This type of roof consists of two pitched roofs from different sides, therefore the calculation will occur according to a similar algorithm. All that remains is to add the resulting values ​​together.

Let us take for the calculation the same parameters as in the previous example, i.e. the width will be 4 meters, and the length will be 7. We make the calculation:

S = (4*7) + (4*7) = 28 + 28 = 56 meters.

Designations have been changed

Square hipped roof

If you look at such a roof from above, you can see that it consists of four geometric shapes, the areas of which we need to calculate. In other words, we need to calculate these values ​​for two trapezoids and two equilateral triangles. All the resulting indicators will need to be added up.

Let's take the same values ​​as the length and width, i.e. 7 (value A) and 4 (value B) meters, and the height will be equal to the conditional 3 (value H) meters.

We calculate using the following formula:

S = A*H/2 = 7*3/2 = 21/2 = 10.5 meters. The value of the second triangle will be the same, so we add these values: 10.5 + 10.5 = 21 meters.

Calculating the area of ​​a trapezoid:

S = (A+B)*H/2 = (7+4)*3/2 = 11*1.5 = 16.5 meters. We add the value of the second trapezoid: 16.5 + 16.5 = 33 meters.

Add up the resulting values: 21 + 33 = 54 meters. This will be the final area of ​​the hipped surface.

Designations have been changed

How to calculate the roof area of ​​a complex shape?

In principle, calculating the roof area of ​​a complex configuration is not much different from previous methods. Of course, you will have to spend a little more time, but the calculation rules are common for everyone:

  • We divide the space into separate geometric elements. As a result, we get various rectangles, triangles, trapezoids and other shapes.
  • Next, you need to use mathematical formulas familiar from school curriculum, thus calculating the area for each figure.
  • remember, that The length of the slope is taken from the extreme line of the eaves and ending with the ridge of the roof.
  • We calculate the indicators for all the resulting figures, and then add all these values ​​together.
  • If you see that the roof slope irregular shape, then it’s better to break it down into two simple figures, because it is much easier to calculate the area of ​​two trapezoids than the area of ​​a polygon. This way you will save yourself time and nerves.

CAREFULLY!

In no case do not subtract such roof elements from the resulting area value, like a chimney, ventilation ducts, attic windows, etc. This may result in you simply purchasing less roofing material than required. Be extremely vigilant!

Calculation of roofs of complex shapes

Dependence of area on type of roofing material

We have already said that calculating the roof area is necessary for in order to calculate the approximate amount of roofing material.

But even if we carried out all the calculations correctly, the material still needs to be purchased with a small reserve so as not to encounter a shortage during the installation process. The type of roofing material also plays an important role, because the technology for covering it can be different.

Slate, metal tiles and corrugated sheets. Each of these materials is sold in the form of sheets, and they need to be laid overlapping. There is such a thing as " effective area» material, so you need to take it into account, and not the actual indicators. If the manufacturing company high level, then it must display such information on the packaging.

  • The length of the building is divided by the width of the sheet of material. To the resulting value you need to add another 10%, which will be used for pruning. This is how we find out exact number sheets covering the entire width of the roof.
  • Divide the length of the slope by the length of the sheet of material. Then you need to add 13%, which will be used for overlap when installing sheets.
  • Then we multiply the number of sheets in the width of the roof and the total number of rows to the eaves. The required figure will be the total number of sheets of slate or metal tiles for a particular roof.

Calculation of a complex roof

In principle, the calculation of all parameters turns out to be not so complex process if you follow the above recommendations.

Our construction calculator can do all the calculations for you. All you have to do is enter the data on the length, width, height and other indicators of the building, as well as the roofing material used.

Conclusion

Correct calculation of roof parameters is necessary for purchasing required quantity roofing material. If you do not have a detailed house plan, then you will have to carry out all measurements yourself, using a tape measure, a ladder and other related tools. Also, do not forget that the type of roofing material also plays an important role, so each calculation should be carried out individually.

If you are not confident in your abilities, then you can entrust this matter to professionals who will do all the work for you. This is practically a win-win option, only if the price of the issue does not bother you much.

In any other case, you can think a little and make individual calculations. As you can see, this is not so difficult to do, but you can save money, which will then be spent on the same materials and more.

In contact with

Have you decided to purchase material for the future roof of your home, and are you wondering how much money you will need for this? your expenses in this matter entirely depend on the correct determination of the roof area, but how to calculate the roof area for a house? This is exactly what will be discussed below.

Let's say you are building a gable roof, this works to our advantage! You can simply calculate the area of ​​one of the slopes and multiply this value by two.

The plane of an ideal slope is an inclined rectangle located perpendicular to the short wall of the building. To determine the area of ​​a rectangle (slope), you just need to use the simplest geometric formula: length times width.

In the case of arranging a roof, the length value is taken equal to the length of the wall, to which should be added the distance by which the roof will protrude beyond the walls, multiplied by two.

And the width of the slope should be taken equal to the sum of the length of the rafter and the length of one roof projection above the wall surface.

Calculation of roofing material

Calculation example

As an example, let's use the calculation of the roof area gable type, in a house whose dimensions are 8 by 6 m (picture above).

The value of the rafter length is L=490cm, and let’s take the length of the roof overhangs as 50cm.

S slope = (L rafter length) + (D house length)

S slope = 4.9*8=39.2 m²

S roof = 2 * 39.2 = 79.4 m².

Well, that's all, the calculation turned out to be extremely simple, but no less accurate. We wish you good luck in your endeavors!

If you have an angle between the rafters that is not 90 degrees or a complex roof shape, then you should use the basic geometry formulas.

The purchase of roofing costs most of budget, so it is worth carefully calculating the metal roof tiles.

Purchase a large number of sheets and in reserve - not rational. Therefore, it is important to accurately calculate the area of ​​​​all slopes and, using formulas, derive the exact number of sheets of metal tiles.

When making calculations, the shape and size of the “waves” of the coating should be taken into account. They are selected based on the model of the purchased tiles. These parameters are indicated on the packages with the material and will serve to take into account the overlap between the sheets.

Standard sheet sizes

Manufacturers of building materials try to adhere to established standard sizes, however, there are types on the market that differ from the standard. If necessary, you can always make and order tiles of the required sizes.

The main parameters when calculating metal tiles for a roof are: the width and length of the sheet. They come in two types: nominal and effective.

Nominal width– the distance between two points of the extreme edges of the sheet without taking into account overlap allowances.

Tile manufacturers try to produce sheets with a nominal width of 1160-1190 mm. The nominal length can be from 500 to 6000 mm.

The most popular sheets are 4500 mm long. They are extremely easy to install and do not require complex fastenings. At the same time, the process of laying the roof does not require much labor. When installing longer tiles, certain difficulties may arise.

Effective width– the size of the tiles taking into account the overlap of the adjacent sheet for efficient and reliable installation.

Overlapping laying is necessary in order to prevent possible ingress Wastewater under the roof. The sheets are laid on top of each other both longitudinally and transversely:

  • the overlap in width is on average 70 +/- 10 mm;
  • The overlap along the length is 110 +/- 10 mm.

The effective width and length are the difference between nominal size and allowances for overlap on each side.

The calculation of the number of sheets of metal tiles is carried out precisely according to effective sizes leaf. When purchasing, you should pay attention to the labeling. Large manufacturers Both sizes are indicated on the packages.

Calculation method for metal tiles on a gable roof

Stage No. 1 – Roof measurements

Before you start calculating the number of sheets required, you should take measurements of the roof:

  • measure the width of the slope horizontally (along the ridge or cornice);
  • measure the length of the slope (from the ridge to the eaves).

To the result obtained for the length of the slope, add 70 mm for the extension from the end of the rafter leg. The overhang is made to prevent drops from falling under the roofing sheets during slanting rain.

Stage No. 2 – Calculation of the number of horizontal rows

To determine the number of rows of tiles, you should use the resulting size based on the width of the slope (length along the ridge). It must be divided by the effective sheet width.

Example: The measured width of the slope is 8 meters. To calculate the number of rows on one slope, the width of the slope should be divided by the effective width of the sheet, which is 1.10 m.

N = 8 m / 1.10 m = 7.27 ≈ 8 rows

Important: You should always round towards a larger value.

Stage No. 3 – Calculation of the number of sheets in one row

The calculation of metal tiles here is carried out according to the length of the slope. To determine the exact number of sheets in a row, you should sum up the length of the slope, vertical overlap and overhang beyond the rafter end. From the resulting amount, you should select the number of sheets, based on their longitudinal size.

Example: The measured length of the slope is 4 meters. Metal tile sheets with a length of 2.25 m were chosen as the roof. When laying, an overlap between the sheets of 0.15 m will be used. As can be seen from the length of the slope, two sheets (2.25 x 2 ˃ 4 meters) will be enough in one row.

To confirm the correct choice, the following check should be performed:

  • add up the length of the slope, vertical overlap and overhang beyond the rafter end: 4 m + 0.15 m + 0.07 m = 4.22 m;
  • fold the nominal length of two sheets: 2 x 2.25 = 4.5 m;
  • compare the obtained values: 4.22 m ≤ 4.5.

If the sum of the nominal length of the sheets exceeds the length of the slope, taking into account all overlaps, then the number is chosen correctly.

Stage No. 4 – Final count

Having counted the number of rows and the exact number of sheets in each of them, you can make the final results by multiplying these two values. According to the examples above, one slope will require 8 rows of two sheets each.

Therefore, the total number per slope will be - 2 x 8 = 16 sheets. If the roof has two symmetrical slopes, then the final value will be 16 x 2 = 32 pieces.

Calculator

Order GrandLine metal tiles in the Petrovich STD store

Calculation of additional elements and fasteners

To fasten metal tiles, use self-tapping screws 4.8 x 32(29). They are sold in packs of 250 pcs. For 1 sq. m of roofing requires 7 pieces.

According to the examples, the roof area was 2x(8 m x 4 m) = 64 m. Then it will require 64 x 7 = 448 screws. From this it is worth concluding that two packages will be quite enough.

Additional elements include:

  • ridge strips;
  • cornice strips;
  • wind slats.

Each of the planks is produced in a length of 2 m. During installation, the overlap is 0.10 m. The calculation is made by dividing the length of the ridge by the length of the plank, taking into account the overlap.

When installing and fastening the planks, 4.8 x 70 mm self-tapping screws are used. In stores they are sold in packs of 100 pieces. For every meter of length of one plank there are 6 screws.

During construction, people face a lot of different problems. One of them is arranging the roof and calculating the amount of material required for its construction. You can find out only if you correctly calculate the area that needs to be covered.

Peculiarities

It will not be possible to calculate the roof area using some universal formulas. For a simple pitched roof, such calculations are the simplest, but there are always nuances, ignoring which leads to dire consequences.

Calculating area always involves:

  • accurate height measurement;
  • determining the degree of inclination;
  • determining the volume of required building materials and fastenings to them (as the final stage).



Design forms

The area of ​​a pitched roof is calculated depending on what geometric shape the proposed roof corresponds to - most often these are isosceles triangles, trapezoids, rectangles and parallelograms. But it is important to consider that almost all roofs still consist of several slopes.


Single-pitch option calculated using the formula for a rectangle.

If there are two slopes, you just need to apply the same formula to each of them and summarize the results.



A roof of four slopes is calculated as the sum of a pair of trapezoids and a pair of triangles with equal sides.


If the form is very complex, you will need to spend more time, but the basic principles remain roughly the same. The first step is to break it down into simple geometric shapes. Then the same formulas are used to calculate the area of ​​any of them as in the standard case. We must not forget that the length of the slopes is measured from the final lines of the eaves to the ridge elements.

When the area is of irregular shape, it is advisable to divide it into even smaller fragments in order to radically simplify the calculations.


Do not subtract chimneys and ventilation ducts , windows built into the roof and other similar elements. When calculating the area flat roof for laying built-up roll materials The area of ​​the parapets is taken into account separately. It is necessary to take into account how the overhang will be located - along the perimeter, with a closed parapet or with a lower overhang and a three-sided parapet.

In the very in simple form square flat roof can be taken equal to the total area of ​​the building, with the addition of overhangs and other elements extending beyond the contour. But such a calculation scheme is acceptable only if there are actually no angles.



With due diligence, it will not be difficult to calculate the area of ​​the pediment yourself. To do this, there will be no need to even turn to online calculators. The configuration of the pediments is closely related to the geometry of the slopes: thus, triangular options most often accompany the formation of roofs with two slopes. When installing the structure, before preparing the rafter frames, the area and height of the gables must be calculated with special care.



Produce necessary calculations, as always, using “school” formulas helps. It is advisable to use electronic calculators only for self-testing.

The lengths of the end walls, divided in half, are multiplied with the tangent of the angle, which creates the slope and base of the roof. For non-residential premises under the roof the height will be much less than for one actively used by people. Wall triangular shape calculated by multiplying the height of the pediment itself and the length roofing base. This result should be reduced by 50%. In the case of a “trapezoid” wall, take ½ of the total length of the bases and multiply it by the height. The pentagonal pediment is conventionally divided into an upper triangle and a lower trapezoid - this simplifies the calculation.



Calculate the area of ​​an L-shaped roof with different slope It’s also not particularly difficult. By its nature, it is formed from a pair of typical gable structures, joined at right angles. To simplify calculations, the general configuration is divided into four similar rectangular trapezoids. The calculated areas are summed up and the final result is obtained.


You can simplify your work (eliminate measuring individual slopes and planes) if you have a carefully prepared plan in hand.

Calculation method

It will not be possible to calculate the square footage of the roof of a house correctly unless you figure out exactly what its shape is. In the absence of clear and unambiguous plans, you will have to prepare them yourself, drawing all the necessary drawings by hand. An equilateral trapezoid is calculated taking into account not only the width of the slopes, but also the lengths of the bases and height. The prepared roof plan must reflect all lengths, widths and heights with an error of no more than 1 cm. If it is possible to measure more accurately, you should definitely take this chance.

It is advisable to prepare a plan in several projections at once, and recheck each measurement and each step of the calculation. A mistake can be very expensive, in the literal sense of the word. Determine number square meters You can do it from the ground, from the roof itself, or from the attic.

To increase the accuracy of measurements and calculations, it is recommended to pay attention even to the asymmetry of the edge, to the excessive width of the ridge, to changes in the angles of inclination in different places. A roof sloped at an angle of 9 degrees is 10% larger in size than an identical flat one.

If the slope increases to 56 degrees, the conversion factor already reaches 1.8, and its approximate change with an increase in the angle by 10 degrees is 15%. The slope angles of the slopes in houses covered with symmetrical gable roofs are determined depending on the length of the base of the isosceles triangle formed by the slopes. To calculate the overlap, you need to multiply the length of the house by the length of the rafters.

The area of ​​all slopes separately is determined as the length of the house with the addition of the front and eaves overhangs, multiplied by the length of the rafters + the length of the overhang. If the roof is pitched, there is no need to double the resulting number.

For the most accurate calculation of the footage of a triangle or any other geometric figure The results obtained from the formulas should be increased by 10-15%. This will compensate possible mistakes and defects when laying roofing material. It will be somewhat more difficult to calculate the roof area for subsequent fire retardant treatment and for impregnation with antiseptic compounds. The methods are approximately the same, but you will also need to take into account the coefficients recommended by the fire inspection. They will allow you to compensate for both calculation errors and overconsumption of impregnating mixtures.

The problem is that the special impregnation is not applied to the roof, and on the sheathing and upper parts of the floors, rafters, trusses and crossbars. But rafters, beams and other similar elements have a much smaller area than the roof itself. And therefore, in most cases, to accurately predict the need for treatment with fire retardants, you will have to enter a coefficient of 1.2. It will successfully “absorb” all the irregularities.

Application of impregnation


The angle of inclination of the roof is calculated between the inclined rafters and the ceiling. When calculating the surface area that sheets of metal tiles, slate or corrugated sheets will have to occupy, we must not forget that one of the waves is spent on connections with adjacent sheets. Therefore, you will have to add another 10% to the resulting area after all the calculations and adjustments. It is also taken into account that sheet materials are measured in linear meters, which must first be converted into square meters, and only then compared with the dimensions of the roof. Additionally, you can check yourself by using specialized online calculators directly from major suppliers of selected coverage.


If the roof does not have a wall gutter, add 7 cm to the slopes above the eaves. And in the case where there is a gutter, a cornice, and an overhang, the length can be reduced by 70 cm. It is additionally necessary to calculate the areas of parapets, a firewall and other structures that are not physically connected to the main covering. Take into account standing seams if single parts are covered roofing steel, not necessary.

Double standing seam


You can also ignore the bypass of the base beam roll coverings. Essentially, it does not play a role, just like the arrangement of aprons.

Before ordering metal tiles or any other roof covering, you have to produce necessary measurements. Taking roofing “measurements” is not as difficult as it might seem. Often they try to order work on measurements from roofing companies for fear of making some mistake. However, if you know a few simple rules, you can take competent and accurate roof measurements yourself.

Draw a diagram in a plane

First of all, you need to draw a diagram of your roof in a plane. “Quite often, clients try to draw all kinds of 3D projections, but in fact, in order to correctly calculate the amount of material, you need the most basic drawing representing a top view,” comments Andrey Opuk, CEO LLC "First Roofing" - Such a drawing does not even have to be done to scale. When you arrive at the company’s office for the final calculation, the manager will simply ask you clarifying questions from the series “Do I understand correctly that you have a connection here?” etc. You just give the necessary comments. Even a computer program that automatically calculates the material divides the roof into segments, which are triangles, trapezoids and other elementary shapes.”

Let's start taking measurements

To make it easier and faster to measure the roof, it is best to do it together. None special devices You don't need a laser rangefinder type. As practice has shown, a long tape measure, which is sold in any construction supermarket, is sufficient. With its help, you need to fix the sizes of all the edges.

Usually measurements take place as follows: one person comes closer to the edge of the roof and fixes the end of the tape measure at the place where the rafter leg ends, and if the roof is old and it is to be dismantled, where the roof covering ends. The second person fixes the tape measure on the top of the roof (on the ridge).

There is one rule that must be followed: in addition to the ribs, it is necessary to take measurements of all slopes. The fact is that often the sizes of the slopes do not match perfectly. There may be slight displacements that are not noticeable to the naked eye. There is nothing fatal about this, but they should be taken into account when making calculations, so measure each slope separately.

Under no circumstances should you take all measurements from the inside of the attic. Otherwise you will get very approximate measurements.

Specialists of Pervaya Roofing LLC advise:

Firstly, roof measurements are best taken after the sheathing is ready. Having only a rafter system, measurements are also possible, but using lathing they will definitely be more accurate.

Secondly, it is necessary to measure the perimeter of the roof, where it is then supposed cornice strip. This size is also necessary to count the number of sheets of metal tiles (or corrugated sheets).

Third, do not forget that the metal tile does not end with the rafter leg. As a rule, a release of 5-10 cm is made so that the roof has decent looking. When the final calculation is made to you, be sure to express to the manager your wishes for the release.

Fourthly, you should measure the perimeter of the pipe outlets with outside. This is necessary to order the junction strips that are needed to protect against leaks. If attic or dormer windows, also measure them and indicate their location on the drawing. This will save several meters of tiles. If the calculation is carried out without taking into account skylights, no problems will arise: the installers will cut the material to size. If any buildings are adjacent to your house, this should also be reflected in the drawing.

Metal tiles out of stock or to size?

Sometimes people prefer to order large sheets of metal tiles, for example, 6 or 7 m wide, so as not to install them with overlaps. We especially note that overlaps do not cause leaks, since this is structurally impossible.

Regarding savings in this case, we note the following. Firstly, by “fighting” for size, you get quite long production times (up to two weeks during the season). Naturally, this is not a problem if you are not in a hurry. Secondly, if your roof area is about 200 square meters, then the savings due to large sheets can be a maximum of 4-5 square meters, but this benefit will most likely come to naught when the cost of delivery and packaging is calculated. For delivery of metal tiles, for example, 7 or 6 meters long, the gazelle is no longer suitable. In addition, manufacturing plants are required to supply roofing materials in packaging, and it is sold by linear meters. It turns out that delivery and packaging of standard sizes may cost less.

We also note that when ordering large sheets of metal tiles, the installation process may become more complicated. Lifting a sheet 7 meters wide to the height of a two- or three-story house with two people is quite difficult. In addition, there is a risk of damage polymer coating, scraping a sheet of metal tile against a staircase or rafter.

The article was prepared by experts from Pervaya Roofing and published in issue No. 28 of the magazine Home: Construction and Repair, July 2011.