Fastening metal tiles with self-tapping screws to the crate. Scheme and detailed description of fastening metal tiles with self-tapping screws. Features of installation of metal tiles with hidden fastening
How to fix metal tiles: fixing diagram and installation rules.
It would seem an uncomplicated and insignificant stage, but in fact, fastening metal tiles is a responsible process that has strict rules, on which not only the neatness of the roof depends, but also its service life, reliability from leaks, and resistance to strong gusty winds.
To fasten the metal tile to the lathing of wooden boards, use special roofing hexagonal self-tapping screws 4.8 × 28 mm with a rubber gasket, the caps of which correspond to the color of the roof. You can buy them together with metal tiles, and in case of a shortage of them, you can buy them in addition at the nearest construction market or in a store.
Tool for fastening metal tiles
For fastening metal tiles, use screwdrivers and a hexagonal socket for self-tapping screws. In this case, the best option for a screwdriver is a cordless one. When using electric screwdrivers, damage to the metal tile in the form of scratches left by extension cords is possible. It also significantly affects the convenience and speed of installation.
The screw attachment is used with the size corresponding to the size of the screw head. As a rule, these are attachments with a magnet.
Fastening metal tiles
Initially, you need to adjust the torque limitation of the screwdriver in such a way that when the sheet of metal tile is finally pressed against the crate, the rubber gasket is slightly compressed.
You need to tighten the self-tapping screw perpendicular to the crate boards. With a reduced torque of the screwdriver, the compression of the gasket required for sealing will not be achieved.
Incorrect tightening of the self-tapping screw
Increasing the torque of the screwdriver will compress the gasket too much, which can reduce the life of the gasket.
In addition, with an increased torque of the screwdriver, there is a danger of the self-tapping screw in the crate and loosening of the fastening.
During the fastening of the metal tile, the degree of compression of the rubber gasket is constantly visually controlled.
If a self-tapping screw gets into a denser wood, for example, a knot, with the "standard" setting of the screwdriver, the self-tapping screw may be under-screwed. In such cases, it is necessary to increase the torque limitation of the screwdriver and tighten the screw. After that, restore the previously set torque limitation on the screwdriver.
The main rule for attaching metal tiles to the crate
When fastening sheets of metal, the screws are screwed into regular places located 10-15 mm below the stamping line, in the middle between the crests of adjacent waves, along the slope area.
With a properly mounted stepping lathing, you can safely screw the self-tapping screw to any regular place, since there is a guaranteed stepping board under the regular place.
In this case, the metal lies on this board without a gap and when the self-tapping screw is tightened, the sheet of metal tile will be reliably pressed to the crate without deforming the sheet. In this case, the screws will be almost invisible on the roof, as they are located in the shadow of the "step".
Step crate - this is a crate of boards of the same size, mounted at equal distances from each other with a step equal to the step of the metal tile. The eaves and ridge boards of the lathing can have a different thickness and can be installed outside the general rhythm of the step lathing.
Incorrect fastening of the metal tile to the crate
The pictures below show typical common mistakes when attaching metal tiles to battens.
Self-tapping screw 5 mm from the edge of the board:
Fastening to the edge of the board leads to the fact that the self-tapping screw splits the edge of the board, which makes the fastening itself extremely unreliable.
The step of the crate is respected, but the step crate is displaced from the regular places:
When the gasket is pressed, the sheet of metal tile is deformed (deformation between the stamping lines):
When the gasket is pressed, the sheet of metal tile is deformed (deformation along the stamping line):
Rule # 1. Docking metal sheets along the waves
Fastening sheets of metal to each other along the waves is intended to protect the plane of the ramp from the effects of side wind and to give the entire plane of the ramp a uniform appearance. Screw the self-tapping screws in each row below the stamping line to any place of the "sector" from the wave crest to the outer edge of the top sheet, as shown in the figure.
To ensure that the longitudinal joints of the sheets do not stand out on the plane of the roof, tighten all the self-tapping screws of these joints until the final fixing of the sheets to the crate.
Rule # 2. Docking sheets of metal in rows
Docking of sheets in rows always takes place on a stepped board. Screw the self-tapping screws into the regular places in each wave.
The figure shows the attachment points of the metal tile by area ( main rule) and along the perimeter of the sheets (rules 1-5).
Along the slope area, self-tapping screws are twisted with a uniform "breakdown" along the slope, moving, for example, from the cornice to the ridge through the row, twisting the self-tapping screws into every third wave, with a shift to the left or right by one wave when moving to the next row to be fastened.
To protect the roof from the effects of wind load, they are additionally fixed with self-tapping screws:
- sheets of metal with each other when joining along the waves (rule No. 1);
- shingles between each other when joining in rows (rule No. 2).
- shingles to the lathing along the ridge line (rule No. 4);
- shingles to the lathing along the end lines (rule No. 5).
The total consumption of self-tapping screws is on average 8-10 pieces per 1 m².
Rule # 3. Fastening metal tiles to the cornice
The most common method of forming a cornice knot, in which the lower regular cut of the metal tile protrudes about 50 mm beyond the edge of the cornice strip and rainwater enters the gutter directly from the sheet of metal tile. The eaves strip is used to protect wooden structural elements from splashes.
In order for the lower wave not to sink down, the cornice board should be 10-15 mm thicker than the others. The center-to-center distance from the eaves board to the first board of the stepping sheathing is 250 mm with a board width of 100 mm.
Screws are screwed along the eaves line 60-70 mm above the stamping line in every second wave.
When using the second method of forming the eaves assembly, the regular cut of the metal tile is located over the eaves plank and rainwater enters the drain from the eaves plank.
This method can be useful for finding a way out of difficult situations, for example, when installing metal shingles with a stepped cornice and unsuccessful step sizes or with a broken roof geometry.
Rule # 4. Fastening metal tiles when approaching the ridge
When installing the roof with warehouse sheets, the top board of the stepping sheathing will be the support board of the ridge. In most cases, you will need to mount an additional ridge board above the top board of the stepping crate, while providing a gap between the ridge boards of adjacent slopes of at least 80 mm to ensure under-roof ventilation.
In order to make it possible to bring the ridge strip at the ends of the house over the end strips, a sub-ridge support board is mounted with a thickness increased by 10-15 mm. If you mount a side ridge board of regular thickness, the ridge will be "squashed" down relative to the line of the end strip.
Fastening the ridge strip to the metal tile
To fix the ridge (backbone) plank, it is attracted with self-tapping screws to the highest points of the metal tile sheets.
Since these points are located at the same distance from the lathing, the ridge strip will not deform when tightening the screws until the gasket is compressed normally. The distance between the screws should not exceed 0.8 m.
Rule # 5. Fastening of metal tiles at the ends of the slope.
Screws are screwed along the end lines of the slope into the standard (corresponding to the main rule) metal tile places in each wave.
Fastening the end plate
To fix the end strip, it is attracted with self-tapping screws to the highest points of the metal tile sheets in every second wave.
Since these points are located at the same distance from the batten, the end plate will not deform when tightening the screws until the gasket is compressed normally.
In addition, the end plate is attached to the pediment board with self-tapping screws with a pitch of no more than 0.8 m. Since these self-tapping screws will be clearly visible, they are screwed in with self-tapping screws in accordance with the markings in order to maintain the rhythm.
Today, metal tiles have become one of the most popular materials used as roofing. It has earned its popularity due to its durability, strength, acceptable cost and excellent appearance. In addition, it is quite easy to mount it if you know the basic rules that must be followed. At the same time, the fastening of metal tiles is one of the most important operations that determine the reliability of the entire structure in the future.
What is important to know before getting started
How to properly attach sheets of metal to the crate
The crate itself is a construction of wooden boards of the same size, which is mounted at the same distance from each other (it must coincide with the pitch of the metal tile used). Boards located under the ridge and at the eaves are often thicker without maintaining the required distance between the boards on the slope.
In the process of attaching sheets of material to the roof slope, it is necessary to tighten the self-tapping screws along a line located 10-15 mm below the stamping line between the ridges. In the event that the crate was made correctly, in full accordance with all diagrams and instructions, the screws can be screwed into any regular place, since there must be a board there. For greater confidence that everything is being done correctly, it is worth watching a video on the topic (even if the work will not be done on your own).
The metal on the boards is always laid without a technological gap, so the sheets of metal tiles will be guaranteed with high reliability pressed against the crate without deforming the material. It is worth noting that the fastenings will not be noticeable, since they will always be in the shadow of such a "step".
Two ways of joining sheets
During installation, it is possible to use several effective methods for joining individual sheets of metal tiles: along waves or in rows. In the first case, the tasks of protecting the plane of the roofing material from side wind and the uniformity and "integrity" of the appearance of the slope are solved. In this case, all self-tapping screws must be screwed in each of the rows below the stamping line, in the sector from the ridge to the outer edge of the top sheet.
If the docking is performed in rows, it is, according to the installation instructions, done on the boards of the stepped crate (fasteners are placed on the boards in each wave). When it comes to the entire ramp, the bindings are evenly distributed. In this case, the movement is carried out from the eaves to the ridge, and fixation is performed in every third wave with a shift in either direction by one wave of the sheet, when the transition to the next row occurs to continue the fastening.
How to fasten sheets along the line of the cornice
The formation of a cornice knot with a sheet protruding beyond the edge (by about 50 mm) is used especially often today. In this case, all the water after the rain falls directly into the gutter, so the wooden structural elements remain reliably protected from splashes, which has a significant effect on their durability. In this case, self-tapping screws, according to the instructions, must be screwed in through one wave 70 mm above the stamping line.
It is important to take into account: so that the lower waves do not sink down, with this method, it is necessary to fix it to a board of greater thickness in comparison with the rest by 15-20 mm. The distance between the centers of the first step and eaves board, with a width of 100 mm, will be 250 mm.
Also, this node can be formed so that the regular cut of the metal tile is located on top of the cornice board (in this case, rainwater will enter the drains directly from it). Most often, this method is resorted to in some difficult situations for roofers when it comes to stepped cornices or violations of the geometry of the roof in a given area.
Ridge approach: fastening metal tiles
At the top of the structure, the lathing always ends with a ridge support board. When performing this operation, the installation of an additional under ridge board is required, thus providing a gap of 80 mm between the same boards of adjacent slopes, which plays an important role in organizing roof ventilation.
An effective way to bring the ridge plank to the end of the entire structure over the planks is to install a support board, which is 15-20 mm thicker in comparison with other sheathing materials used for roofing.
This is the only way to avoid "subsidence" of the roof ridge in relation to the line of the end strip.
Fastening of the ridge (ridge) strip is carried out with self-tapping screws at the highest points of the roofing material. The distance between the fasteners is up to 0.8 m. It should be noted that all fixation points will be located at an equal distance from the roofing batten, therefore, when tightening the screws, there will be no deformation of the ridge bar.
Fastening at the end of the slope
First of all, it is necessary to fix the sheets of metal tiles along the end lines of the roof slopes in each wave of material in the regular places. Then, in order to fix the end plate, you need to fix it to the highest points of each of the sheets through one wave of material. The step between the bindings, as when approaching the ridge, is no more than 0.8 m.
In these places, the fasteners will be noticeable, so it is advisable to clearly observe equal distances between them (it is best to make a markup first).
When additional fastening with self-tapping screws is required
The main task in this case is the resistance of the structure to wind loads. In this regard, it is necessary to ensure increased reliability of fastening in the following areas:
- sheets of metal with each other when using the fastening method:
- by waves (1);
- along the rows (2).
- sheets to the crate:
- along the line of the cornice (3);
- along the ridge line (4).
- along the end line (5) sheets are fixed on the boards.
More clearly the same information is presented on the video, where you can more clearly learn about all the intricacies of the issue.
- There is a way to make your job much easier! Follow the rule: if the work is started from the left edge of the structure, all sheets attached to it must be brought under the wave of the previous sheet of material.
- After the first sheet is fixed at the ridge with a self-tapping screw, the second should be laid in such a way that a perfectly straight line is obtained at the bottom. The overlap is fixed with one self-tapping screw along the crest of the wave, under the first transverse fold.
- In the case when the top row of the skate does not work out perfect the first time, you need to follow the following instructions:
- slightly raise the sheet of metal;
- gradually tilt the sheet from bottom to top, alternately stacking the sheets in the desired position;
- fasten along the top of the ridges under the transverse folds;
- attach the sheets to the crate (the operations are quite simple, but it is easier to watch the entire process described in the video).
- Installation of sealing strips is necessary at the ridge and at the joints of the roof surfaces with a hipped roof. They are nailed to the profile, and then covered with a ridge bar or a protected joint. If a waterproofing material was used, additional seals are not required.
- In places with through holes and overlaps, a special sealing compound (usually silicone) is used.
- Ridge: the bar is installed only after the complete completion of all work on fixing the sheets on all surfaces.
- Fastening metal tiles in the places of internal joints, it is recommended to use a strip for a gutter of a standard design. In this case, an overlap of more than 150 mm is not allowed, the resulting seam must be sealed.
A very important fastener used during roof installation is a self-tapping screw. This detail acts as a guarantor of the quality of reliable fixation, determines the durability and strength of the future roof.
So that unpleasant situations do not happen during the installation of the structure, you need to find out in more detail what self-tapping screws for metal tiles are, as well as study the subtleties of choice and installation rules.
Features:
The presence of a washer is the main distinguishing feature of roofing screws. The main task of the auxiliary element is to evenly distribute the pressure of the head on the surface of the roof covering, as well as to completely seal the mounting hole. The functional features of the self-tapping washer for metal tiles influenced the fact that a rubber sealing ring appeared in this product.
Since the roof is exposed to precipitation, it is important that the seal material is of sufficient quality. Based on this, the best is the EPDM type rubber O-ring. This material perfectly tolerates temperature drops and other negative factors, while maintaining its main characteristics for a long period of time.
The anticipated structural load affects the type of roofing screws. According to this criterion, fasteners are divided into two categories: metal-wood and metal-metal. This classification should not be neglected, self-tapping screws must be used strictly for their intended purpose.
Do not worry about the self-tapping washers that can stand out on the surface of the roofing material.
Currently, in the construction market, it is quite easy to choose the required shade of self-tapping screws that fully matches the color of the metal tile.
Specifications
Usually roofing screws are made from galvanized carbon steel. The anti-corrosion coating extends the service life, which can last up to 50 years.
There are also self-tapping screws made of stainless steel, used preferably in places that require strict provision of increased reliability and strength of the roof. Their price is much higher than galvanized ones.
Self-tapping screws for metal tiles are also classified according to the shape of the cap, which is:
- standard, adapted for a screwdriver or screwdriver;
- hex, requiring special bits.
Self-tapping screws and markings differ, each has certain technical characteristics:
- the hardness of the material;
- product length;
- step on the thread;
- flange thickness;
- diameter and height of the cap;
- turnkey size.
Among the wide variety of options for fixing elements, you can choose suitable fasteners that have the necessary technical characteristics in one case or another.
Kinds
Roofing screws are divided into two main types:
- for wood;
- for metal.
Self-tapping screws for wood have a rather rare thread and a tip designed in the form of a drill.It is quite difficult to screw a self-tapping screw for wood into metal. These fasteners may be needed in the case when it is necessary to screw a metal coating to a wooden crate. The most used sizes of wood screws are 4.8 by 28 mm and 4.8 by 35 mm. Self-tapping screws for wood are equipped with a press washer with a seal, this design performs a waterproofing function.
Self-tapping screws for metal have frequent threads, they are slightly larger in diameter than those described above and practically do not hold in wood, therefore they are not used for fastening to wooden structures.
They are used to fix the roofing to the metal profile lathing.
The most used sizes of self-tapping screws for metal:
- product 4.8 by 19 mm, with a metal thickness of ≤ 3 mm;
- 5.5 by 25 mm, metal thickness ≤ 6 mm;
- 5.5 x 35mm and 5.5 x 50mm for drilling in metal ≤12mm thick.
Both types of self-tapping screws have either a standard or a hexagonal head, a washer with a seal, a thread and a tip with a drill. These fasteners are produced in various colors corresponding to the color palette of corrugated board or such cladding as metal tiles.
Material consumption
Fasteners should be purchased at an average rate of 8-10 pieces per 1m2 of roof area. It should be understood that the number of self-tapping screws per square can be increased in the case when the roof has a non-standard geometric shape or some additional elements.
In the lower part, it is recommended to place fasteners through one wave in each of the sheets of metal, while the self-tapping screw is screwed in in places where the wave cavity rests on the profile. It is considered a gross mistake to fix through the crest of the wave - this can deform the metal tile. Then the screws are screwed through the wave, observing the rows in a checkerboard pattern.
Sheets of metal tiles are overlapped from the side, these seams should be secured along the crest of each wave. The end plate is fixed, observing the pitch of the screws of 500-600 mm. The ridge strips are fixed with special ridge self-tapping screws, they are also screwed into the roof covering through one wave.
Criterias of choice
By purchasing self-tapping screws in a hardware store (in order to avoid buying a low-quality product), parts need to be tested for several indicators.
- Test for the quality of the protective coating. To do this, it is necessary to firmly squeeze the press washer using pliers. A product with a poor-quality coating will surely crack. In most cases, electroplated zinc is used as a coating. This helps ensure maximum material adhesion.
- It is necessary to check the strength of the gasket to the base and the quality of the rubber washer, which is located directly under the head. The sealing ring ensures the tightness of the self-tapping screw head to the sheet of metal, the durability of the roofing depends on it. Poor quality gaskets deteriorate over time under the negative influence of the atmosphere, moisture begins to pass through, which leads to corrosion of the coating.
- It is necessary to check the presence of the corresponding marking on the head. The absence of such can be an indicator of quality discrepancy.
For a guaranteed purchase of high-quality self-tapping screws, experts recommend products of European brands. Of course, these products are more expensive, but the high quality of the material, the proven durability and reliability of the products (along with a long-term warranty) compensate for the costs incurred.
Roofing fasteners are made of high carbon steel and are tested before being sold. Manufacturers of quality goods guarantee a long service life, which is about 50 years.
During testing, self-tapping screws are subjected to strong deformations:
- about 20,000 bends at 5 degrees;
- 2000 bends at 10 degrees;
- 100 15 degree bends.
The required dimensions of the roofing screws, as well as the thread pitch, are determined based on the materials to be fastened, their thickness and the desired penetration depth.
Installation features
Fastening metal tiles is a difficult process that requires certain knowledge, skills and abilities. When starting installation work, first of all, you should worry about the high-quality preparation of the base or lathing, to which the metal tile will be attached in the future. This structure is made of wooden planks, the horizontal step between which must be a multiple of the size of the sheets of roofing material.
For example, the width of the tiles is 1000 mm, which means that the pitch of the lathing is better to be equal to 500 mm - this will ensure the fastening of one sheet of tiles to three slats at once. After that, it is necessary to think over the scheme of fastening the roofing material with self-tapping screws.
Basic requirements and features of installation.
- Do not use tools for mounting screws without the ability to adjust the speed.
- When screwing in roofing fasteners for wood, the number of revolutions on the device should not be more than 1800 rpm (more than 1500 rpm - for metal screws).
- It is necessary to screw in the screws only at right angles to the plane of the roofing material using magnetic attachments.
- It is necessary to adjust the tightening force of the self-tapping screw so that after screwing in the edges of the seal protrude from the edges of the press washer by approximately 0.5-1mm;
- Damage or breakage of the self-tapping screw is not acceptable, including the removal of any part of it.
- It is considered correct to screw thin metal to a thicker one; on the contrary, this is not recommended.
Technological features of the installation process depend on factors such as:
- type of products used;
- their thickness;
- characteristics of the lathing, etc.
In this case, in any case, the total thickness of the fastened products should be at least 3 millimeters less than the length of the roofing screw.
In most cases, self-tapping roofing screws are attached to any material without pre-drilling. However, there are situations that require through drilling before screwing in the self-tapping screw.
Most often this occurs when working with metal products that have a fairly large thickness.Drilling is carried out with a drill, the drill diameter of which is 0.5-1 ml less than the self-tapping screw. To screw in self-tapping screws, various tools are used, the choice of which depends on the type of head of the fastener.
How to choose self-tapping screws for metal tiles, see below.
Today, metal roofing can be said to be the most common material for roofing. Fastening its sheets is not difficult at all, even with your own hands. However, you need to know that only on condition of competent and high-quality fasteners can you get a roof that will reliably serve up to several decades.
Installation of metal roofing involves fastening the sheets to the crate. At the same time, it is important not only to choose good-quality fasteners, but also that the scheme of fastening the metal tile with self-tapping screws is correct. , competent installation can provide such a roof with a half-century service life.
Getting to know more self-tapping screws
Perform using roofing screws.
It is extremely undesirable to use nails for these purposes, since the impact resistance of the metal tile is not high enough and, under the influence of loads of this kind, the building material exfoliates.
Externally, these are ordinary screws, but made of alloy or stainless steel. A real self-tapping screw must also have an anti-corrosion coating, as a rule, of a zinc layer. All these are important components of effective resistance of fasteners to corrosion processes.
The hexagonal shape of the head contributes to an even distribution of the load over the surface of the tile. Since, in addition to its direct purpose, it must also seal the mounting hole, therefore, a sealing gasket in the form of a flat ring must be provided under the washer. The unremarkable ring seemed to perform several functions at once:
- protects against the appearance of scratches, and, therefore, rust;
- from the formation of depressions or dents after laying the coating;
- seals the hole for the fastener.
This small part is under the constant influence of daily temperature changes, precipitation, wind, therefore, high-quality material must be used for its manufacture. The best option, as practice has shown, is EPDM rubber, which is resistant to the above negative factors and does not lose its elasticity for a fairly long period.
Roofing washers are produced in different colors and if it is correct, fastening metal tiles with self-tapping screws will not stand out against the background of the coating at all.
Buying self-tapping screws, of course, is not difficult, but keep in mind that many of the well-known manufacturers offer original self-made self-tapping screws. As a rule, they are supplied in a set. In case of refusal to purchase the attached fasteners, the buyer does not receive a guarantee for the purchased roofing material .
The size
There are several sizes of mounting screws. Their choice depends on the purpose of the fastener. It should be noted that roofing screws are grouped according to metal to metal or wood. The purpose of the element can be easily identified by the markings on the head.
How to properly fix metal tiles
Fastening self-tapping screws has its own nuances. This primarily concerns the torque of the screwdriver. It needs to be limited, the rubber pad must not be compressed strongly, and here's why. If the torque is insufficient, the required degree of sealing will not be ensured, if the torque is too high, the screw can turn in the crate, which can cause unwanted loosening of the fastening. In addition, this will lead to deformation of the gasket, and the coating will fail earlier.
The next point is also important - the direction of the fasteners. The screws are fixed strictly at right angles to the batten at the point where the wave bends.
Sheet fixing rules
With an average of 8-10 pcs / m 2 screws are required. Fasteners along the lower edge of each sheet are screwed into the profile deflection through the wave. Then the next bindings are staggered in rows, keeping the same step - through the wave.
If the project includes additional elements, or the roof has a non-standard configuration, then the fastening scheme and the amount of material will most likely change.
This order of fastening is preserved for all overlaps except for the side overlap, where the fastening is performed in the crest of the wave. 
- The ridge bar is attached with special screws through the wave.
- The end plate is fixed in 50-60 cm increments.
- When fixing accessories, 3 screws / rm are used. m. They are fixed with a step of 0.35 m in a shear wave. If the fastening is performed along the slope, then the hardware is screwed into the upper ridge. The process continues step by step through the wave.
In the process of fastening, it is necessary to remove all shavings from the surface with a soft brush, since they will rust quickly enough and will spoil the appearance of the coating.
Payment
Let's calculate how many screws are needed for a metal tile. To find out their total number, we will proceed from how many are on the sheet.
Let's say the roof area is 150 m 2, and for the lathing, bars with a cross section of 0.3x15 cm were used. The dimensions of the slope are 102 x 77.5 cm. With these assumptions, you need to install 40 sheets. It has already been noted that when fixing the sheet to the crate, hardware of the corresponding sizes is used - 4.8 by 20, 30 or 50.
- When fixing the joints of the rows, approximately 6 fastening elements are required, which will total 120 self-tapping screws.
- The side joints of the roofing sheets along the length are fixed with 21 self-tapping screws for each joint. The result is 378 fasteners with a 4.8 x 20 format.
- If we proceed from the calculation of three self-tapping screws per sheet, then another 120 hardware will be required to fasten the metal tile along the cornice and ridge lines.
- It remains to add another 88 screws that hold the end lines together, since one usually takes 22.
- If you follow the recommendations of the manufacturers, then for each sheet you will need at least 5 more pieces, that is, a total of 40x5 \u003d 200.
Thus, for our roof, without taking into account additional elements, we will need 528 hardware measuring 4.8 by 35.
Fastening metal tiles is not a very difficult process, but it requires compliance with certain requirements and rules. If everything is done correctly, the roof covering will last a long time.
The metal tile should be fastened with self-tapping screws with a special EPDM rubber gasket. This will prevent leaks. Screw caps are usually painted, which makes them almost invisible on the roof. It is very convenient to use a screwdriver with a battery for work:
- It greatly simplifies the work, due to the absence of a cord.
- Thanks to its low weight, it improves mobility.
- The presence of several batteries will significantly extend the operating time without recharging.
In other cases, it is necessary to fasten in the lower places of the deflection. This guarantees the highest quality and most reliable fastening. Self-tapping screws are screwed in strictly perpendicularly. If the fastening scheme for the metal tile is observed, then 8 self-tapping screws are required for each square meter. In addition, it is necessary to screw in self-tapping screws along the perimeter of the roof at each deflection. 
It is important to clean metal shavings from the roof. If this is not done immediately, then over time it will rust and the appearance of the metal tile will be spoiled.After transportation, you need to carefully inspect the surface of the metal tile for scratches and other damage. If any are found, you need to paint them with paint using an ordinary spray can. It is recommended to do the same with the cut sites. Make sure that the capillary groove is covered with the next sheet. It serves to remove moisture generated by capillary action.
Features of fastening sheets of different shapes and sizes
If the roof is large, the question arises, how to fix the metal tile? Indeed, at the joints there can be up to 4 sheets, which will cause displacement. To prevent this, it is necessary to turn the sheets when stacking. The fastening scheme should be selected taking into account the comfort of the work. It is best to start installation from the side that is most even. It is necessary to align the sheets of metal tiles along the line of the cornice. In case the roof has a triangular shape, the beginning of the process is slightly different. You need to draw a line from the top point exactly in the middle of the ramp. The same line on the sheet of metal tile during installation must coincide with the first. 
To ensure maximum convenience for cutting sheets, roofers collect the so-called devil. This fixture consists of 4 swivel boards. In size, it should be equal to the working width of the metal tile. 
Hidden sheet fastening and its features
This type of coating is considered the most durable and reliable. The main difference is that there are no fastening elements on the surface. In addition, this option has a more beautiful appearance and provides an exceptional tightness of the coating. Metal tiles with hidden fastening have a very simple fixing scheme. The sheets are fastened together with the help of protrusions located at the edges. The screws are screwed into the grooves, which are covered with the next sheet. Since the screws are not visible, it is not necessary to use painted with a certain color or with an EPDM gasket. Ordinary galvanized ones are quite suitable. Mount on the cornice and ridge
According to the technology without a drip, it is necessary to place the lower edge of the sheet up to 50 mm longer from the edge of the cornice. As a result, precipitation is removed directly into the gutter. The edge can bend under the weight of the snow, so you should not make the ledge more than recommended. Special requirements are imposed on the crate in the place of the cornice. The strip located on the edge should be about 15 mm thicker than the others. Sometimes the fastening takes place on the eaves, then it is not required to make a protrusion of the metal tile.
On the cornice, the screws are twisted in each wave up to 8 mm above the stiffener. It happens that the distance between the punching line and the upper cut of the metal tile exceeds 13 mm. 
In the area of \u200b\u200bthe ridge, the metal tile is attached to each wave, as well as in the cornice. When installing the ridge, it is imperative to use the sealing gaskets, which are usually included in the kit. Fastening with self-tapping screws must be carried out in the wave crest. The step should be chosen in such a way that in a strong wind there are no characteristic clapping sounds of metal on metal. After completion, you need to ask the assistant to visually verify that all elements have been installed and secured according to the described technology. Installation of metal tiles around obstacles
It is advisable to plaster chimneys and other elements before fastening the roof sheets. However, you can leave this work for later, only you have to be much more careful. It is important to correctly bypass the obstacle so that the water that will drain along the vertical surface gets on the metal tile and leaves safely. Sheathing boards should be installed around the obstacle to ensure continuous coverage. Metal tiles on both sides of, say, pipes need to be cut at a distance of 150 mm. 
The most common mistakes of fastening metal tiles
It is very important to choose the right screws. There are cases when a high-quality metal tile is purchased and a decision is made to save on fasteners. Or elementary mistakes are made when choosing. And it turns out that the service life of the coating is 50 years, and it deteriorates much faster due to poor-quality self-tapping screws. If the washer is made of ordinary rubber, then it will dry out and crack over time. As a result, the tightness is broken, water "gets" to the crate and roof. Everything is collapsing at a rapid pace. Do not use a self-tapping screw with a long thread to screw into the crest of the wave. Thus, it will not be possible to achieve a proper abutment of the washer and there is a high probability of deforming the metal tile. Fastening metal tiles is a process that requires compliance with certain rules and mandatory adherence to technology. By correctly positioning the fastening elements, you can guarantee the reliability and tightness of the surface.
