In the list of compelling advantages of profiled roofing steel, the ease of installation is rightfully listed. One large metal sheet immediately covers a significant area. The number of fastening operations and measures for leveling elements has been reduced.
True, the dimensions of the coating cannot be unconditionally attributed to the number of advantages, for example, when arranging oblique ridges of roofs with four slopes. So that they do not cause difficulties, you should know how a hipped roof is constructed from corrugated board, how proper laying is carried out on its plane.
Profiled roofing steel is produced in the form of corrugated or wavy sheets with or without a polymeric protective and decorative sheath.
It is made of cold-rolled metal, hot-dip galvanized, which provides the material with stable resistance to atmospheric attacks.
In the lines of profiled sheets from different manufacturers, there is a conditional division into the bearing, wall and roofing categories. However, in the arrangement of roofs, any kind that the owner of the house likes can be used, if he is not too worried about the difference in the cost of load-bearing and roofing options. Note that the corrugation material for roofs is smaller, the weight is lighter and the price is more attractive.
For the arrangement of roofs with profiled sheets, all types are produced that greatly facilitate roofing work. Within the limits of products from one manufacturer, they are absolutely similar to those used in laying metal tiles. Because in fact, both roofing representatives are the same material, differing only in the presence or absence of a transverse profiled step.
By analogy with a metal tile, a drainage gutter is arranged along the right or left edge of the corrugated board panels. It is designed to remove moisture accumulated in the connecting seams of the coating. During installation, the extreme wave with a groove should be under the adjacent sheet of material, and its direct opposite should overlap the same groove of the adjacent element on the other side.
The installation of the coating is carried out with the imposition of one or two corrugations of the stacked panel on the element already located on the slope. The number of overlapped longitudinal recesses depends on the angle of inclination of the slope and the bearing capacity of the material. When calculating the material for arranging the roof, it is necessary to take into account how many corrugations are recommended to overlap.
The connection of individual panels into a common large-sized roofing sheet is made in a convex ledge with short self-tapping screws that do not go deep into the crate. But to it the metal roof is fixed with a recess in the wooden parts through the concave part of the corrugation. Fastening elements are made in the tone corresponding to the color of the roofing and are equipped with elastomer washers that ensure tightness at the connection point.
The profiled sheet is delivered to the object of the required length, declared by the customer when making the purchase. The miter cutting is not done by the supplier, it is done before laying on the construction site. In order not to overpay for the surplus, it is recommended to make a roof project or at least draw a sketch on a scale before purchasing the material.
Roof design from corrugated board
Installation of corrugated board on hip and hip roofs is made with a significant difference from laying sheets on structures with two slopes. The fact is that large-sized coating elements require cutting and are installed in a special order:
- For tent. First, the central axis of the starting sheet and the slope along the crate is marked. Then a fitting is carried out with the alignment of the axes, during which the cut lines are marked. All subsequent sheets are tried on and cut in fact at the facility.
- For hip. The first sheet is installed so that its edge coincides with the extreme edge of the right or left rack of the ridge run. The start sheet does not have oblique cuts, it is installed to the full height of the roof. Only panels adjacent to oblique hip ribs are cut.
In the arrangement of tent structures, the material for all four slopes is cut according to the same pattern. At hip roofs, the roof is cut into two end slopes and laid in the manner used in the arrangement of hipped roofs, and into two long ones with partial cutting.
When drawing up a project or sketch of a roof, for calculations before purchasing material and for developing your own roofing plan, you need to consider that:
- The number of sheets is calculated according to the width of the base of each slope.
- The height of the sheet is determined according to a pre-compiled scheme. It should be positioned so that it, if possible, completely covers the hip rib.
- The calculations use not the total, but the useful width of the corrugated board when laying with an overlap in one corrugation. If two corrugations go under the overlap, the calculated useful width will decrease by one more wave.
- Sheets on triangular slopes are laid out from the center, on pentagonal slopes - from the extreme point of the ridge run.
- The optimal arrangement of corrugated board panels minimizes the number of roofing parts that are less than half the width of the sheet. These are too weakened places of the roof due to the large number of attachment points per unit area and seams.
Without fail, the heights of the profiled panels must be increased by the width of the overhang above the eaves. This is the lower edge of the sheet 3.5 - 5.0 cm wide, extending beyond the frontal board.
During the design period, it is necessary to decide whether the holders will be installed before or after the paving is laid. In the first case, so-called long brackets are used, the installation of which must be carried out before installation work. In the second case, short hooks are used, fixed on the frontal board, their fastening can be done at any time.
During independent design, you should decide whether the structure needs an insulation system. The thermal insulation device significantly affects the consumption of material and the design of the truss system, because the roofing cake:
- The cold roof includes only one layer. This is a waterproofing, arranged from a classic film or anti-condensation material with a pile that absorbs excess moisture under the roof and parting with them during the ventilation period.
- The insulated roof includes three layers: steam, heat and waterproofing. From the side of the operated premises there is a vapor barrier film that protects the heater following it from household fumes. From the outside, the insulation is protected by a waterproofing carpet.
A roofing pie for a professional sheet is arranged with one or two functional ventilation circuits. Their number depends on the waterproofing material chosen for the arrangement. It is important to remember that options containing bitumen cannot be used as waterproofing under a polymer-coated metal roof.
The first ventilation circuit is laid between the insulation and the waterproofing carpet, if classical polyethylene or fleecy anti-condensation material is used as it. If a diffusion membrane is used, there is no need to form a ventilation duct above it, because. it spontaneously releases excess moisture to the outside when stress occurs.
The second ventilation circuit is built between the waterproofing and the metal roof without fail. Regardless of the material chosen for its device, direct contact of the corrugated board with a water-repellent carpet should be excluded in order to avoid the appearance of condensation first, and then pockets of rust that corrode the metal.
The minimum value of the ventilation gap is proportional to the area of the slopes. For example, if the area to be equipped is 50 m², then the total area of \u200b\u200bventilation ducts for this slope should be 0.5 m². The last value should be divided by two in order to distribute the ventilation gap into the inflow and outflow zones. For gable roofs, these values \u200b\u200bare equal, for four-slope structures, some difference is eliminated by installing an additional aerator.
Preparing the truss system
Note that profiled roofing steel is laid on both wooden and metal roof structures. The device of a metal frame is typical for non-residential objects, most often for household purposes. The frame can be welded or collapsible with bolted connections. The rafters are a channel or a corner, the laths are a square pipe or a U-shaped profile.
It is not customary to build a roof over residential buildings using metal truss systems. Wood is more suitable, and it is much easier for independent craftsmen to work with it. Therefore, we will disassemble the laying of the profiled sheet on a wooden base, as the most common option.
The rafter system and the crate can reasonably be recognized as a reliable foundation for the installation of profiled sheets if:
- The installation step of the rafters is not more than the limit of 1200 mm. The optimal interval is from 600 to 900 mm.
- The rafter legs are made of timber with a section of 50×100 or 50×150 mm, depending on the wind and snow load typical for the region.
- The cross section of the lathing is selected depending on the distance between the rafters and the steepness of the roof.
Lattices under a professional flooring are established with an equivalent step. Reduce the distance between them only in areas that require reinforcement: along the perimeter of the cornice overhangs to a width of 50 - 60 cm for the subsequent installation of snow retainers, in the valleys, along the ridge run of the hip roof, around the roof passages.
If the truss system does not have sufficient parameters to ensure the reliability of the base for laying the profiled sheet on a hipped roof, it is reinforced by increasing the section of the batten or reducing the step between the battens.
Roofing pie device algorithm
The construction of a roofing pie is carried out in the traditional manner observed when installing any insulated roofs. It should be remembered that before installing a waterproofing carpet around the perimeter of a four-slope structure, a dropper must be installed - an angled bar made of sheet steel, designed to drain condensate.
Sequencing:
- Vapor barrier device. The rolled material is fastened with a stapler to the rafters, between each other with adhesive tape. It is rolled out in horizontal stripes, laid with an overlap of 10 -15 cm. If it is planned to install sheathing with OSB, plywood or GVL panels, a crate is constructed over the vapor barrier along the rafters.
- Insulation lining. Thermal insulation made of basalt or glass wool is placed in the cells formed by the rafters. The material is cut so that the width of the heat-insulating element is approximately 1 cm wider than the distance between the rafters for laying it by surprise.
- Installation of a waterproofing carpet. The water-repellent material is laid on the outside of the rafters with horizontal strips glued together with adhesive tape. Laying begins at the eaves, continues to the top or ridge run. It is temporarily attached to the rafters with a stapler, then fixed with battens.
On hip and insulating films they are laid with an overlap through an oblique ridge of 15 - 20 cm. Along the line of the ridge ridge of the hip roof, the insulating layers must have a gap. The gap is not satisfied along the oblique ribs.
If the thickness of the insulating layer is equal to the width of the rafter leg, it is recommended to use a superdiffusion polymer membrane as a waterproofing. It does not require the formation of a ventilation gap between itself and the insulation, because. able to rid the material of condensate.
When using classic or anti-condensate fluffy waterproofing, there must be a gap between it and the thermal insulation. The width of the channel is 3 - 5 cm. It is formed by means of a crate from a bar with the same size of one or both sides, attached to the rafter legs from the outside. Then waterproofing is laid on top of it and the crate is mounted again to create a gap of the second level - between the coating and the waterproofing carpet.
It is possible not to waste energy in addition over time on the installation of a ventilation duct if the thickness of the thermal insulation is less than the width of the rafter leg by at least 3 cm.
The construction of a roofing pie without insulation is much easier and much faster. All actions consist of laying waterproofing on the rafters and installing a remote batten on top of it. After that, it remains only to install the cornice strips, then cover the four-pitched roof planes with corrugated board, correctly fix them, and fix the ridge elements.
Marking and cutting of metal coating
To mark the cutting of panels at an angle, it is recommended to stock up on a simple home-made device, which was called the “devil” by craftsmen. For its production, four pieces of a 25 × 100 mm board or a bar of a suitable size will be required. Two blanks will be approximately 1.1 - 1.2 m long. The second pair may be the same length or slightly longer.
The process of manufacturing an elementary device for marking:
- On a desktop or a free flat area, we lay out the prepared cuttings of the board in the shape of a rectangle or square. Naturally, they will be located in two parallel pairs.
- Between the left or right edges of the horizontal elements of the device under construction, we form a distance equal to the working width of the roofing panel. Most often it is 1.1 m.
- We check the pairwise parallelism of the parts of the future device. After checking, we fasten them with swivel joints so that they can move relative to each other in parallel pairs.
For marking with the help of a “devil”, we attach a marked panel to the sheet installed and fixed on the roof. We install a home-made tool on an oblique edge of the hip so that it marks the line of the upcoming cut. We mark the panel, transfer it to a place convenient for cutting and cut it.
The profiled sheet can be cut with a sharp circular saw, the technical capabilities of which include the function of cutting thin sheet steel. For small amounts of work, a jigsaw or roofing scissors is suitable for removing excess material. It is unacceptable to use a grinder in cutting a metal roof.
When cutting a coating with a polymer shell, it is necessary to ensure that it is not damaged by small chips. If scratches or cuts of the coating are detected, they must be covered with repair paint.
Small sharp particles of the material to be cut must be carefully removed from the panel with a soft brush before installation. Stubborn stains should be cleaned with soapy water. The cut edges of the sheets, at least from the side adjacent to the hip and ridge ribs, are recommended to be treated with varnish or a repair compound.
Laying a profiled sheet on a hip slope
The fastening of the profiled sheet to the triangular plane is accompanied by the fitting and cutting of each sheet. Before installing them, the roof perimeter is equipped with a cornice strip mounted to the crate.
Panel marking works are carried out in a strictly defined sequence:
- On the first sheet we mark its central axis, on the slope Mauerlat - its middle.
- We install the first sheet, combining the marked centers of it and the Mauerlat, we check the horizontalness of the lower edge of the panel.
- We fix the first sheet with one self-tapping screw at the top.
- We install adjacent panels, one of which is superimposed on the edge of the sheet with a capillary groove, the second is slipped under it from the opposite side.
- Align the block of three panels with respect to the horizon and with each other.
- We temporarily fix each of the newly installed sheets with one screw at the top, trying to position the fasteners outside the part required for laying.
- We mark the cutting lines.
After completing the markup, remove the temporary fasteners and cut off excess material from the panels. Then we return them to their place, install them according to the scheme described above, fix them again only at the top of the central sheet and align the block before final fixation.
First of all, the sheets are fastened into a single roofing sheet along the corrugation superimposed on the lower element with 4.8 × 19 mm self-tapping screws screwed every 50 cm. For this, self-tapping screws 4.8 × 38 mm are used, which are installed in the profile recess in every second recess.
Fastening to the cornice grate is made in each profile recess, in the middle of the sheet the fasteners are distributed evenly so that there are 5 fastening points per 1 m² of coverage.
At the end of the work on laying the sheet covering, the installation of ridge elements is carried out with preliminary laying of the sealant along the edges of the extensions. In the arrangement of trapezoidal slopes, planks are first installed on the hip ribs from the bottom up, then a plank with plugs is mounted on the ridge ridge.
Video about the principles of laying corrugated board
The sequence of work on laying corrugated roofing:
A video about the first experience in self-laying corrugated board:
Folk tricks in the construction of roofs from a profiled sheet:
So that the result of difficult work does not disappoint and does not require impressive investments in rework, you need to know how to properly cover an architecturally complex object - a four-pitched roof with corrugated board. The material presented by us will provide effective assistance to independent roofers. Compliance with the described rules guarantees success.
One of the most inexpensive, durable, practical options for roofing material is, or, as they say, a professional sheet, a metal profile. This is a sheet of metal that is coated with several protective layers, and then passed through a forming machine, which presses projections and grooves into it - to make it more rigid. The material turns out to be quite light, corrugated roofing can be mounted independently and even "in one hand". The technology is not the most difficult, it is quite possible to do it yourself.
Types of corrugated board
There are different types of corrugated board. There is a regular profiled sheet - galvanized, there is a colored one - with a layer of polymer applied over the zinc coating. The polymer coating has a dual role - it both protects against external influences and gives the material a more decorative appearance. Simple galvanized corrugated board is used as a roofing material mainly on temporary buildings, colored has a very solid appearance, it can be seen on the roofs of residential buildings and courtyard buildings.
By appointment
Decking is made from sheet metal of various thicknesses. The thinnest ones are designed for decorating walls, but can be laid on the roof with frequent lathing and small snow loads. The sheets of this group are marked with the letter "C".
From the thickest metal, a material with increased bearing capacity is made. It is marked with the letter "H", used as a roofing material in areas with increased wind or snow load. There is also a universal profiled sheet - it is designated "NS". It can be used both for walls and for roofing (the amount of snow should be average).
After the letter encoding of the profiled sheet, there are numbers: C8, H35, HC20. They indicate the height of the wave in millimeters, which is formed in this material. In the example, these are 8 mm, 35 mm, 20 mm, respectively. A corrugated board with a wave height of at least 20 mm is laid on the roof.
The waveform of the supporting metal profile is often more complex - additional grooves are added to it to increase rigidity.
By type of coverage
With all the external similarity, the price of corrugated board of the same type can differ significantly. The point, most often, is not the impudence of the manufacturer or seller, but the different technologies and materials that are used in production. For example, the protective coating may be zinc and aluminum-zinc. The second type of protection has appeared recently, the equipment is expensive, but the durability of metal coated with aluminum zinc is much higher.
The method of wave formation also affects the durability of the coating. There are two technologies - cold rolling and emulsion. During cold rolling, the sheet is simply pressed through by rollers without any preparation. In order not to damage the previously applied coating, expensive equipment is required. Accordingly, cold rolled profiled sheet is more expensive.
When forming a wave with an emulsion, the metal surface is wetted with a liquid (oil, water, special liquid) and then sent under the rolls. If, after rolling, such a sheet is not dried, but sent to a firing oven to fix the paint, then the places that were wet will quickly begin to rust. It is impossible to see this defect in advance, one has to hope that the technology is not broken. But the profiled sheet made using this technology is cheaper.
There are also different polymer coatings. They create a film of different thickness and density, with different properties.
- Polyester (glossy and matte). Polyester-coated profiled sheet has a relatively low price (the cheapest of the colored ones) and good characteristics - the coating is plastic, does not change its color for a long time. Matte polyester has no glare on the surface, it looks like velvety. This is achieved by a different application technique and a thicker layer. This coating is the most resistant to mechanical damage.
- Plastisol. It has increased resistance to aggressive environments, but does not tolerate ultraviolet light. A corrugated roof with a plastisol coating will fade quickly (two to three years).
- Pural - polyamide and acrylic are added to polyurethane. The coating is more uniform, the service life without color change is from ten years. The disadvantage is the high price.
- PVDF is a compound of polyvinyl fluoride and acrylic. The coating is expensive, but it lasts a long time even in an aggressive environment. This roofing material can be used on sea coasts. Another of its remarkable properties is that it can self-clean. The slightest rain, and the PVDF-coated corrugated roof shines like new.
Under normal conditions, roofing is made of corrugated board with a polyester coating. In terms of price-quality ratio, it is optimal.
How to lay corrugated board on the roof
Roofing from corrugated board is laid on a finished crate of boards, in which the fragments are arranged parallel to the roof overhang. The installation step of the crate is up to 60 cm. They usually use an edged inch board, 25 mm thick. Sheets are stacked one after another with vertical overlap on one wave. When laying the profiled sheet on the roof, please note that the extreme shelves have different lengths. The one that is a little shorter should be at the bottom, which is a little longer - it covers the short one. In this case, they adjoin one another tightly, without a gap. If you confuse and do the opposite, then a gap of several millimeters is formed between the two shelves, into which water will flow. Therefore, be careful during installation.
On the amount of horizontal overlap. If there is more than one row of corrugated board on the roof, the sheets are laid with overlap. The amount by which the top sheet overlaps the bottom sheet depends on the angle of the roof slope: the more gently sloping the roof, the more entry is needed.
Most decking factories can offer you sheets that will cover your entire roof - from ridge to eaves - in one long sheet (maximum length 12 meters). During installation, this creates certain difficulties - such sheets are difficult to lift and stack. Especially it will take a long time to expose the first sheet - it must be placed strictly vertically, which is difficult at a height. But the main advantage of such a solution is a continuous coating from top to bottom, which at times increases the degree of protection of the attic from moisture penetration, crosses out all the inconveniences. After all, there are no horizontal joints, which means there are no problems with leakage either.
How to fix corrugated board on the roof
To fasten the profiled sheet, special self-tapping screws with rubber gaskets under the caps are used. They provide a tight connection. Such self-tapping screws are usually painted in the same tone as the roofing material. The number of fasteners per square meter is 5-7 pieces (do not forget to add about 20% for fastening the ridge element, fixing joints and other similar work).
Self-tapping screws are installed in the lower shelf, where the sheet is in contact with the crate. Their length is 20-25 mm, depending on the thickness of the board of the crate, since it is important that the sharp end of the screw does not protrude from the back of the board. There will be a waterproofing film that can be damaged.
When connecting two adjacent sheets, they are also fastened with self-tapping screws. But in this case, you have to screw the fasteners into the wave, and also punch through a double layer of metal. For these purposes, the fasteners are longer - 40 mm or more (depending on the height of the wave) - the screw must go into the crate board.
How to cut
Very rarely, the installation of corrugated roofing does without trimming - these are just unique cases. How to cut a profiled sheet? Metal shears or electric jigsaw. Yes, it's slow, and not very convenient, but that's exactly what the manufacturers advise. It is impossible to use an angle grinder (grinder) - when cut with it, the sheet heats up to very high temperatures at the cut point, which leads to the evaporation of zinc. As a result, in this place, the material quickly begins to rust.
Mounting order
After collecting the truss system, the front board is nailed, hooks are attached to it for installation, and on top of an already special bar - a dropper, on which the edge of the waterproofing film is then wound. Both the dropper and the film are attached to it with self-tapping screws with a sealing rubber washer.
The composition of the pie of materials for corrugated board depends on whether you are going to make the attic space cold or warm. If the attic is cold, the sequence of actions is as follows:
If the roof will be insulated, the order of work and the amount of required materials will change. There will be more layers:
Roofing from corrugated board: knots
Even with a conventional gable roof, there are several complex sections that are usually formed at the junction of different planes and / or parts of the system. These areas are called "nodes". We considered one such knot in the previous paragraph - the design of the front board and the fastening of drains. But this is far from the only node where a detailed explanation is required.
Installation and sealing of the ridge
The under-roof space under the corrugated board should be well ventilated. This material heats up quickly and also cools down quickly, which contributes to the formation of condensation. Therefore, when installing a metal profile on the roof, in the upper part, the sheets on both sides do not join closely, but leave a gap of several centimeters - so that air can freely escape, taking water vapor with it.
If there are special skates with ventilation (pictured), but even if you just install a regular ridge element between the profiled sheet and its edge, you get a large number of holes - in each corrugation cavity. The size of this gap depends on the height of the wave - the higher the wave, the larger the gaps. On the overhang, where the front board is nailed, there are also similar holes. Air movement usually goes from bottom to top - from the overhang, through the under-roof space (for this, it is necessary to leave ventilation gaps that are formed by the crate when installing the roofing material), to the slots in the ridge. This is how the ventilation and regulation of the humidity of the insulation takes place, the condensate evaporates and is carried away.
Large gaps are good for ventilation, but precipitation clogs in them when it rains / snows with the wind, and dust and leaves get into the attic through them. It is much worse if the holes are clogged with leaves - ventilation will immediately deteriorate. In order not to get into a similar situation, earlier about 2/3 of the height of the gap was filled with sealant, applying it in layers to the roofing material. Crawling back and forth with sealant on the top of the roof, waiting for the previous layer to polymerize a little, is not very convenient. Also, this decision is wrong from the point of view of ventilation - the gap decreases, air movement worsens. But there was no other solution. Now it is - a sealant for corrugated board. It is made from polyurethane foam, polyethylene or wood composite. The structure of these materials is porous, well passes air, but not dust, water or leaves. In shape, it either repeats the shape of the corrugations - there are different types of profiled sheets, and there is also a universal tape, which is simply pressed in the right places.
The sealant "sits" on the sealant, double-sided tape, glue, there are options with self-adhesive tape. With such a seal, air passes freely, and precipitation remains in the outer layers, from where it then evaporates.
Overhang filing with profiled sheet
In order to sheathe the overhang with a profiled sheet, a special profile is attached to the front board. A profiled sheet is inserted into its groove, cut into strips of the desired width. The second edge of the filing is attached to a board nailed to the ends of the rafters. The junction of the filing and the board is closed with two droppers - one is nailed from below, covering the lower half of the board, and the second - from above. The edge of the waterproofing film is then laid on it.
If a drainage system is to be attached, then the hooks for the gutters are nailed after the installation of the lower dripper. The top dropper is nailed after all the hooks are installed.
Adjacency of corrugated board to the wall
In some cases, a metal profile roof is adjacent to the wall of some structure. How to make a connection so that there are no leaks? There are two options (see picture). Both use a corner bar, only it has a different size and a different profile.
You can take a corner bar with shelf dimensions of 150 * 200 mm. A shorter side is brought to the wall, a longer side to the roof They are attached to the wall using fasteners depending on the material from which it is made (nails or self-tapping screws if it is wood, dowels if brick and building blocks). The junction of the plank with the wall is covered with silicone sealant. From the side of the roof, a bar is attached to the crest of the wave by installing special self-tapping screws with rubber washers. Their length is determined in the same way as when connecting adjacent sheets of corrugated board (wave height + 20 mm for entering the crate board).
The second option is more time-consuming: a strobe (groove) is made in the wall, into which an angle bar with shelves bent at 45 ° is inserted. The fastening in this case is similar, the difference is in the dimensions of the bar - it can be 100 * 100 mm or so.
Pipe passage
Many questions arise when sealing the passage of a chimney pipe or ventilation through a corrugated roof. Pipes in cross section are round and rectangular, each type has its own solution.
For the passage of round pipes through the roofing material, there are special steel or polymer aprons. Their upper part is made in the form of a cone, the lower part - a skirt - is made of an elastic material that can take a given shape. The apron is tightly put on the pipe, lowered so that the "skirt" lies on the roofing material. Next, you need to give the elastic skirt the shape of the corrugations. Use a hammer for this (normal or rubber - depends on the type of apron). To prevent water from flowing under the skirt, the joint is smeared with sealant, pressed well.
After fixing the skirt, the neck is fixed. If the apron is metal, the top is covered with a clamp, tightened, the joint is coated with sealant. When using a polymer apron (master flush), it is put on the pipe with a decent effort (sometimes it is even necessary to lubricate the pipe with soapy water), but the joint, nevertheless, for reliability, is sealed.
With a rectangular (brick) pipe, everything is somewhat more complicated. Elements are cut out of metal sheets that close the joint with the roofing pie.
- 1 Benefits of using corrugated board
- 2 Mounting considerations
- 3 Installation in the area of the valley, ridge and pipes
- 4 Fasteners and seals
- 5 Videos
- 6 photos
Decking is a universal material made on the basis of galvanized metal sheet, widely used in modern construction practice. Elegant and attractive forms of roofing, made of profiled sheets of bright colors, are quite common today in private buildings. Often they are made in the form of a combination of geometric shapes of various configurations, giving the roofing a special chic and originality.
Roof sheeting with capillary groove
Before you cover the roof with corrugated board with your own hands, we advise you to familiarize yourself with the advantages of this material, as well as take into account some of the features of working with it.
Benefits of using corrugated board
Decking
The main advantage of corrugated board is the possibility of its independent installation, produced without the involvement of third-party workers. In this case, you can get by with the forces of just a few people invited as assistants.
First of all, you should know that the profiled billet is made from a cold-rolled metal sheet with a combined protective coating. The sheet blank formed in this way has the following advantages:
- the profiled sheet has a sufficient thickness to ensure the resistance of the roofing to mechanical stress (to the effects of wind and packed snow);
- multi-layer coating, which includes a special paint layer, reliably protects the metal base from the damaging effects of moisture (corrosion);
- galvanized corrugated board is cheaper, but over time, such a coating fades;
- the cost of the material in question can please a potential consumer with its availability.
Mounting Features
Installation of corrugated board on the roof
Everyone who wants to get acquainted with how to properly prepare a roofing from corrugated board, first of all, it is necessary to take into account some features of the operations carried out in this case. First of all, these features should include:
- a method of delivering sheet material to the place of work (to the attic of a building being erected or being repaired), ensuring the complete preservation of the appearance of the material;
- the procedure for manufacturing the lathing used as the basis for the installation of roofing;
- the safety of the operations performed, ensured by the observance of the rules for working with metal (the use of overalls and gloves, for example), as well as the need to use soft shoes to move along the laid material.
Sheathing for corrugated board
In addition, before starting work, it is necessary to determine in advance the main characteristics of the mounted truss system (rafter pitch, roof overhang angle, etc.), which, in turn, depend on the configuration of the coating itself.
In the most general case (when installing roofs of complex configuration), it is necessary to ensure that the following conditions are met:
- First of all, the fastening elements of the lower valley (the junction of adjacent roof planes, which serves to drain rainfall) should be prepared.
- The laying of the roofing itself should begin with fixing the end cornice strips, located approximately at the level of the waterproofing layer.
- Installation of the coating begins, as a rule, from the corner of the roof (in cases with hip structures - from the center of the hip);
- The amount of overlap between adjacent sheets (the so-called overlap) is selected depending on the angle of the roof. It usually has a value from 150 to 200 mm, but not less than the width of one wave.
- At least seven self-tapping screws should be spent on fixing each sheet; moreover, the most important joints are sometimes strengthened with special steel rivets.
Before the final fixation of the workpieces laid in a row, they are all subject to mandatory alignment along the lower cut of the slope.
Installation in the area of the valley, ridge and pipes
Installation of corrugated board in the ridge area
When installing corrugated board, you will definitely encounter the need to finish such places that are inconvenient for laying, such as valleys, chimney pipes, ridges and other junctions. To finish them, it is necessary to use special elements included in the profiled sheet covering kit.
The order of installation of adjoining elements is as follows:
Fasteners and seals
Roofing screws
Roof seal self-expanding To fix profiled sheet blanks, it is recommended to use special galvanized self-tapping screws, complete with sealing gaskets made of elastic material. The caps of the fasteners must be protected by a special composition, matched to the color of the coating and providing them with the necessary resistance to corrosion, mechanical and ultraviolet influences.
Often in practice, when installing corrugated board, special gaskets are used to ensure a snug fit of the coating material to the base planks. The use of sealing elements makes it possible to protect the under-roofing structural elements from the ingress of climatic precipitation in the form of rain, snow, wet drizzle, etc.
Such protection not only increases the service life of the elements of the truss system, but also improves the soundproofing characteristics of the entire coating as a whole.
Roof ridge seals made of corrugated board
Currently, manufacturers of building materials produce sealing elements that repeat the structure of the corrugated surface of corrugated sheets. In addition, special seals are also commercially available to ensure a secure fit of the ridge roof elements.
- do-it-yourself solar battery from improvised means;
You can watch a video on working with roofing material of the class we are considering at the end of the article.
Video about the installation of corrugated board with your own hands. In the process of viewing, the author will share some professional secrets that few people talk about:
Installation of corrugated roofing
Old house covered with corrugated board
Red corrugated board
Roofing from corrugated board
Gable roof made of corrugated board
Roof made of galvanized corrugated board
The roof is one of the most important elements of a building. The reliability and longevity of the entire building depend on the correctness of its installation. The trade network of building materials has a large selection of products for roofing. Profiled flooring is in the lead. The technology of laying corrugated sheets is not difficult. Before starting work, you need to familiarize yourself with the features of this material and the rules for mounting it.
Profiled flooring is a versatile material that has found its application in the construction of fences, light structures, finishing wall and roofing. Blanks are used even in bold experiments in the absence of experience in the construction of the roof.
Material Description
The corrugated board is made of steel raw materials of cold rolling, covered with polymer protection. The height of the workpiece profiles can be 8-75 mm. Wave-shaped, rectangular and trapezoidal shapes provide additional rigidity. Decking can withstand mechanical stress and high loads.
Advantages of a profile flooring:
- Optimum thickness allows you to withstand intense wind loads.
- Resistant to rain, snow, corrosive stains and the damaging effects of aggressive substances due to paint and galvanized coatings.
- Lack of difficulties during installation work.
- Convenience in transportation.
- Light weight, exerting a small load on the foundation.
- The ability to choose from a palette of shades of polymer coating, gives individual appeal to the roof.
- Low price compared to other coatings used for roofing.
After cutting the blanks to the specified dimensions, it is necessary to treat the sections with a special anti-corrosion primer to extend the service life of the covering corrugated board.
Lightweight roofing with a slight slope is covered with blanks HC 35 or C 44 with a trapezoidal or sinusoidal profile.
The length of one sheet is 2-6 meters or you can order the production of corrugated board with individual dimensions of 0.5-12 meters.
The pitched roof is covered with elements of the most common brand NS 35 - profile height 57-114 mm. The letter "H" denotes the flooring used for load-bearing structures.
To get a more detailed idea, you can watch the video:
Required additional items
The selection of self-tapping screws with a polymer coating is carried out according to the color of the main corrugated board and its structure. The tip in the form of a drill makes it possible to use it in working with metal structures with a thickness of not more than 2 mm. Self-tapping screws are sold complete with sealing washers made of neoprene rubber.
You can get tips on choosing the right self-tapping screws by watching the video:
When sealing the under-roof space, in particular, for sealing the ridge, a special sealant is used that repeats all the curves of the corrugated board. The function of the ridge is to protect the docking joints, as well as to create a decorative roof decoration. The ends of the skates are inserted into special plugs.
Installation of corners is carried out in order to connect corner parts.
Selection of tools
Before you do it yourself, you need to prepare a mandatory set of tools:
- laser building level;
- long tape measure;
- construction knife;
- marker or pencil;
- metal scissors;
- high power screwdriver;
- construction stapler and staples to it;
- electric drill;
- a hammer;
- sealant gun;
- fixture.
Ensuring the slope of the roof
Buildings are made with a mandatory roof slope of at least 12˚. Depending on the value of the angle of inclination, laying is carried out with overlapping edges of adjacent parts: - less than 15˚ - overlap is 200 mm;
- less than 30˚ - 150-200 mm;
- over 30˚ - 100-150 mm.
In places of overlap, mandatory sealing of the seams is carried out with the help of mastic or sealing tape.
Preparatory design work
At the first stage, measures are taken to measure the roof:
The length of the slopes along each diagonal is determined, the planes are checked in parallel using a level.
The estimated length of the workpiece must correspond to the slope of the roof plus 40 cm for the overhang.
The required number of profiled sheets is determined using simple mathematical calculations, while not forgetting to add tolerances for the amount of edge overlaps (overlaps).
With complex roof geometry, the calculation is made for each unique figure, and then the sum of the results obtained is determined. When calculating the amount of corrugated board, you need to remember about skates, pipes, windows, ends, etc.
Roofing pie device
In addition to the covering layer, the roofing composition has several mandatory elements:
- thermal protection;
- waterproofing;
- vapor barrier layer;
- ventilation.
The calculation of each layer is carried out by a method similar to determining the number of profiled sheets.
Features of laying corrugated board
Laying profiled flooring is carried out in compliance with simple rules:
- When raising the flooring up, wooden logs are used.
- Work is carried out in calm weather to prevent damage to the sheets if they accidentally fall.
- It is possible to move along the profile only along the deflections of the waves in the area of the battens.
- Places of cuts or other violations of the integrity of the corrugated board are treated with special enamel to prevent metal corrosion.
- It is recommended to use thick protective gloves to avoid injury from sharp edges.
- The remains of debris after installation work are swept away with a brush or washed using a soapy solution.
- The laying of the roof covering is completed by the obligatory removal of the packaging film.
Algorithm for roofing with profile decking
The elements are laid on a crate, which has a continuous or step character. The step size may depend on the degree of roof slope. When the bevel is less than 15 °, the distance between the planks made of metal or wood is from 300 to 400 mm, above 15 ° - the step is increased to 600 mm.
To prevent rain or snow from getting into the gaps between the sheets, installation is carried out from the bottom layer, gradually moving up.
Important! Decking having a wavy profile is laid from the side subject to the least wind blowing.
With a sufficient length of the slope, a solid profiled sheet is used, while it is laid from the end part. Alignment is carried out, focusing on the eaves, providing an additional 40 cm for overhangs.
The installation of the coating is carried out very carefully, step by step referring to the plan drawn up in advance:
- The installation of the first element is accompanied by fixing with a self-tapping screw in the middle.
- When laying the second part, the edge overlaps (overlap) on the previous fragment. The fastening method is repeated.
- After preliminary laying of the parts completely over the entire roof, they are aligned, focusing on the horizontal of the eaves.
- The connection of the elements of the corrugated board with each other at the very ridge, falling into the deflection of the wave through the step.
- Final fastening. On a vertical line, self-tapping screws are installed in the crate through one board, along a horizontal line - with an interval of two waves. At the ends, the crate layer is fixed at each step. At the top near the ridge and at the bottom at the cornice, self-tapping screws are inserted in each deflection.
- The joints are strengthened at all mating points.
- Excess parts are to be trimmed with scissors on all sides.
- Installation of end plates. Starting from the lower level towards the ridge, an increase in length is made, creating an overlap of 50 mm. Mounting self-tapping screws are installed one meter apart.
- After laying the self-adhesive sealant on the corrugated board, the ridge element is attached. The overlap of the edges of the ridge strips should be 100 mm, the distance between the fasteners should not exceed 300 mm.
Watching the video will give a more accessible idea about the installation of the roof:
Features of installation in difficult areas
Difficult areas are characterized by the presence of internal corners, they are called valleys. Difficult places are the joints of two slopes, the areas of ventilation outlets and chimneys. Internal joints need careful sealing to protect the places under the roof from moisture penetration. The crate here has a solid look.
The joints of the profiled flooring and the planks need to be sealed with a sealant or mastic. The slats of the valleys are fixed together with the profiled sheets. The top bar is installed on the profile to close the edge joints and protect them from rain and snow.
The distribution network has additional elements that have non-standard shapes to avoid the difficulties associated with covering a complex roof.
A video in a more visual form can demonstrate the process of laying corrugated board:
Every craftsman with basic building skills, with a basic set of tools, can cover the roof with corrugated board with his own hands, even without much experience. Therefore, this type of roof is the most popular in private housing construction, as well as in the construction of outbuildings and outbuildings. Decking is inexpensive, and serves 25-50 years, making it a long-term leader among roofing materials in its price category. With the help of this affordable material, both a gable roof and more complex structures can be mounted. The technology of laying corrugated board on the roof is quite simple, we will talk about it in detail in this article.
Do-it-yourself corrugated roofing is a common design solution for a small private house, garage, shed or shed, which is popular among developers due to the excellent performance of the material. Decking is made from galvanized steel by cold rolling. During the manufacturing process, the surfaces are embossed to give greater horizontal rigidity and then cut into sheets of standard shape. The popularity of the profiled sheet is explained by the following factors:
- Efficient removal of water from the slope. Installation of corrugated board improves drainage from the roof surface, thanks to the gutters directed along the slope. Overlapping with corrugated board helps to solve the problem of snow and liquid retention on roofs with a small slope.
- Versatility. The instructions recommend installing a profiled sheet if the roof has a slope of 12 to 60 degrees. Almost all used roof structures fall into this range.
- A light weight. One square meter of profiled sheet weighs 5-7 kg, overlapping with this material does not increase the load on the rafter frame and the foundation of the structure.
- Resistance to mechanical influences. The corrugated board, due to the large number of vertical stiffeners, has high strength, it can withstand snow loads up to 1-1.5 m without deformation, as well as the weight of a person.
- Resistance to corrosion, fungus, mold and other biological factors of destruction. The installation of corrugated board solves the waterproofing problem, does not collapse under the influence of moisture, and serves for many years.
- Easy installation. You can cover the roof with a professional sheet yourself; any worker with basic building skills and a basic set of tools will cope with this task.
- Affordable price. A profiled sheet sheet costs 400-600 rubles, so covering the roof with this material will not cost so much.
Note! Before you cover the roof with corrugated board, you need to choose a high-quality, durable material. The profiled sheet is produced painted and unpainted. A paint or polymer coating that gives color to the material also performs a protective function: it prevents the penetration of moisture and the formation of corrosion. However, if the paint layer and galvanized coating are damaged, the corrugated board begins to rust quickly. The most reliable is considered to be a profiled sheet made of galvanized steel with a pural coating.
Design features
Novice craftsmen often do not know how to properly cover the roof with corrugated board, so they become a victim of lack of experience. Poor installation reduces the waterproofing qualities of the roof structure, reduces the life of the material, leading to the formation of corrosion or leaks. Decking can be laid on pitched roofs with a slope of 12 degrees. Experienced craftsmen can make a roof from this material, even if the slope has a smaller angle of inclination. The corrugated board is laid with a vertical overlap of 2 waves, and the vertical joints are treated with a silicone-based sealant.
Important! Before covering the roof with corrugated board, you can purchase material directly from the manufacturer, cut into sheets along the length of the slope. This allows installation with a minimum number of joints, which increases the service life and waterproofing qualities of the coating, as well as saves money by using less material.
Before you cover the roof with a professional sheet with your own hands, you need to study the technology of working with this material. Usually, manufacturers give detailed instructions describing the sequence in which installation should be performed. The corrugated roofing is a multi-layer cake, which, in addition to the finish coating, includes waterproofing and vapor barrier. Working with corrugated board has the following features:
- Before you cover the roof with corrugated board, you need to make a crate. If the distance between the rafter legs does not exceed 100 cm, you can use 30x100 mm bars. If the step exceeds 100 cm, the cross section of the crate bars must be increased.
- Before laying corrugated board, you need to make a crate. For this material, a lattice crate can be laid with a step between the bars of 30 cm. In the places of valleys and ribs, a reinforced solid base is installed.
- Before starting the installation of the roofing, it is necessary to cover all the wooden elements of the truss frame with an antiseptic preparation, as well as to perform the treatment with a fire blocking composition.
Many homeowners do not know how to properly cover the roof with corrugated board, and therefore make annoying mistakes that affect the operation of the structure. A major defect is the absence of vapor barrier and waterproofing in the roofing pie. The corrugated board has a high thermal conductivity, which leads to the condensation of water vapor on the elements of the truss frame.
Profiled sheet laying technology
Most homeowners who want to cut construction costs do their own roofing but don't have a clear idea of how to properly roof deck. As a result of an unprofessional approach, the roof can leak, become covered with ice, the truss frame begins to rot and collapse. To avoid these negative consequences, it is necessary to strictly observe the technology of laying corrugated board. Instructions for the construction of a roof from this material is as follows:
Important! Profiled steel with a polymer protective coating deteriorates from thermal influences, therefore, a grinder or welding is not used to cut the material. Installation is carried out strictly in a cold way, and the sections are treated with a special primer that prevents the formation of corrosion.
Video instruction
