Roof parapet is a standard attribute of flat roofs, including inversion ones, but can also be installed on pitched structures. The functional purpose of the parapet is to ensure the safety of people on the roof. In addition, this element can serve as an architectural decoration of the building.

Design requirements

According to SNiP, it is mandatory to install a parapet on the roofs of buildings whose height is more than 10 meters (to the eaves), and the slope angle reaches 12%. If the roof slope exceeds 12% and the height of the building to the eaves is more than 7 meters, a fence is required. First of all, this requirement applies to flat roofs in use where people are expected to stay.

The roof parapet can be made of various materials, first of all, this:

• monolithic reinforced concrete;
• brick;
• concrete blocks;
• metal.

A metal parapet is usually a welded enclosing structure that is attached to the roof over roofing.

The height of the roof parapet is usually selected based on architectural features buildings, roof configurations, its functional purpose. According to SNiP requirements, the parapet must have a height of at least 45 cm. The maximum size of the structure is 1.2 meters.

The minimum value of the parapet height is due to the need to install an additional waterproofing carpet, which is attached with an overhang of 25 cm or more onto the vertical surface of the structure. The parapet must be protected from above with a special metal apron, protecting it from the destructive external influences of snow, rain and wind. The apron for the parapet can be made from:

• metal profiles;
• galvanized steel;
• copper

Often, parapets made of concrete or brick are protected on top with concrete slabs and decorative stone. In this case, the metal apron is not installed.

A flat roof parapet may have a horizontal or pitched top. It is also possible to manufacture designs non-standard shape By individual order. When installing a steel apron, it is necessary to use fastening crutches, and the fastening points must be treated with high quality construction material. silicone sealant. If they are laid on top of the parapet concrete plates, the joints between them must be reliably sealed, as well as the junction of the roof and the parapet.

Brick parapet

The enclosing structure on the roof, made of brick, is usually an extension brick wall building, which is carried out after installation of floors. At the design stage, it is recommended to determine the required height of the brick “side” in order to provide for the installation of a special groove during laying, which is necessary to connect the roof to the parapet.

The groove is made if the structure has a height exceeding 50 cm. In other cases, the rolled roofing carpet is placed on its upper plane, followed by installation of a protective apron.

Arrangement of the junction

Adjacency soft roof to the parapet requires enhanced waterproofing. Roll roofing is mounted onto a vertical surface. Reinforced waterproofing of the junction is required. If you lay the material without installing a special support, a cavity will form under the roofing carpet at the junction of the planes. This leads to the risk of accidental mechanical damage to the flooring, violation of the tightness of the coating.

To avoid problems associated with damage to the roof covering during roof cleaning or roof operation, a bead is made at an angle of 45° between the base of the roof and the parapet. For this, a cement-sand mortar is used, in some cases it is possible to lay wooden blocks of triangular cross-section, treated with a fire-retardant composition. Such a side allows for a tight fit of the rolled material over the entire plane.

If the waterproofing is made of roofing felt, it should be glued to the base of the roof, side and parapet wall with heated bitumen mastic. After cooling, it is necessary to glue the second waterproofing layer. To connect the roof to the parapet, the upper edge of the material used is inserted into a prepared groove, or onto top part designs.

The edge of the rolled material inserted into the groove must be secured with a metal clamping strip using dowels. The plank and joint are treated with sealant and painted with paint that is resistant to atmospheric influences. The upper metal apron is then attached to the same bar.

A roof parapet is a structure that performs not only an aesthetic, but also a practical function and can be installed on roofs of any shape and size. In our article you will find out why exactly it is installed, what types exist, what requirements are imposed on these products in building codes. In addition, you will be able to learn the nuances of arrangement, creation options, get acquainted with the advice of professional installers and find out whether it is possible to do without the construction of a parapet or whether this construction is mandatory.

Purpose of the design

Installation of a parapet is possible on any roof, regardless of its size, degree of inclination, shape and material of manufacture. Main functions of the product:

Protecting people who walk on the roof, perform there construction works or repair, from falling to the ground.

Hold sliding under their own weight snow masses, their one-time collapse, which can cause harm to the life and health of passers-by, as well as property.

Visual camouflage pipelines, air ducts, cooling equipment and other items that detract from the appearance of the structure.

Additional resistance strong wind load, which is especially important in regions with harsh climates.

Improving waterproofing properties roofing structure, protection of joints from leakage.

The ability to create a safe and beautiful observation deck, if the roof has flat design with zero tilt angle.

A properly installed parapet on the roof will protect the structure from precipitation, hurricane winds and other external influences, and will also decorative decoration the building itself.

Structure and varieties

Today, two types of parapets are common - from stone materials and from various types metals Most often, the former perform a predominantly practical function, and the latter – a decorative one. Appearance the product depends on the characteristics of the façade of the house, most popular types:

• Curly shape.

  Skates.

On a note! The roof apron is most often made of metal sheet, which has a thickness of up to 0.7 mm.

A figured parapet usually has the shape of a railing; it is distinguished by many bends and indirect lines; most simple system combines two slopes and a dropper rectangular shape. More difficult option involves bending the drip under the visor: installation of the system is more expensive, but it will be more resistant to external influences.

A parapet is considered a mandatory structure on any building if the height of the structure exceeds 10 meters. The dimensions of the product itself depend on the function it performs: for example, structures designed to protect roofing coverings from wind and precipitation are smaller than systems that serve for safety on roofs with walking areas.

On our website you can find contacts construction companies who offer the service of designing and performing roofing work of any complexity. You can communicate directly with representatives by visiting the “Low-Rise Country” exhibition of houses.

Any parapet, regardless of its shape, size and design has a single structure:

Shelf– the main element.

Overhangs– parts located in a perpendicular position to the shelf.

Droppers– side parts that are used for drainage.

Most often, the structure is made of steel, aluminum, brick, concrete or blocks; combined materials can be used (for example, concrete base With metal railings). The upper part is usually covered with a galvanized sheet or reinforced concrete slab, as this protects the product from corrosion and mechanical damage. A metal profile of a horizontal, single- or gable design can also be used.

SNIP requirements

According to building regulations, the parapet must be installed on buildings more than 10 meters in height and with a slope of up to 12 degrees. In the case of a greater roof slope, the structure can also be installed on houses of lower height. In addition, decorative parapets can be installed on buildings with a flat roof and low height, since they perform an aesthetic function, and not only have a practical purpose.

Parapet with tempered glass railings - durable and beautiful

One of important parameters– parapet height at flat roof; SNIP defines the value as 45 cm, while maximum size equal to 1.2 meters. It is not necessary to make a parapet structure on the roof if it is not in use, i.e. There is no observation deck, walking area or other structures at the top. If the roof is used as a resting place, part summer cafe, the parapet is made with a height of 120 cm to protect people from accidental falls.

Arrangement of the junction point

An important point when creating a parapet is the connection of the structure to the roof. To finish with a galvanized sheet, grooves are cut into the structure and the edges are brought in there metal products, bending them at an angle. In order for the junction of the roof to the parapet to be arranged according to all the rules, and the connection to be reliable, several rules must be followed:

The niche where the edge of the apron is inserted should be not less than 100 mm deep.

Gates in the parapet are needed fill with cement mortar so that the wall does not deform or crack during the first long downpour.

On a note! Along the entire length of the system, you need to fix wooden plugs in increments of 100 cm: they are needed for nailing the bars and then laying the apron on them. The sheets themselves are laid overlapping with a margin of 10-12 cm.

If we're talking about about a flat roof, then you need to use additional waterproofing with mastic, reinforce the structure with geotextiles or other materials containing fiberglass. The insulating layer is made with an overlap of 120-150 mm, the joints are coated with mastic, and the cake itself is secured with an apron. High-quality waterproofing of the junction is especially important if a coating in the form of soft tiles or roll roofing: A supporting part must be provided at the joining point.

Is it possible to make a parapet on a sloping roof?

A parapet on the roof can be installed regardless of the degree of inclination, however, when creating a structure on a pitched surface, it is important to observe increased safety measures and take into account a number of nuances. For example, with a seam roof with a protrusion, you need to crimp it metal corners with perforation and fasten with bolts. The fence itself is mounted on the corners.

Another installation method is practiced if the roof is made of corrugated sheets or metal tiles. Fastening is carried out with self-tapping screws rubber gasket. The use of such fasteners allows you to seal the coating as much as possible, protecting it from precipitation.

To ensure that the installation of the parapet takes a minimum of time and is carried out correctly, it is recommended to take into account the following nuances:

Required before installation calculate roof area, determine the average amount of precipitation during the year and clarify the load on square meter: these indicators will be required when determining the amount of materials for the arrangement of the parapet itself.

For installation climbing equipment required and skills high-altitude work, therefore, the task of installing a parapet can only be entrusted to professionals who have the appropriate equipment and a license for such activities.

Often the structure is a continuation of the wall, so its construction is carried out at the stage of building construction. This means that the system needs to be thought through at the design stage of the house.

Metal parapets are considered very popular: they are durable, lightweight, resistant to temperature fluctuations, moisture, mechanical stress, and have long term services. It is possible to cover the structure with a metal profile; the connections are made seam to ensure maximum tightness. In addition, the building can be equipped with parapets, for example, made of armor-resistant glass or especially durable plastic: the supports are made of metal, and the space between them is covered with sheets of such material. The apron on the roof, which serves for drainage, is usually made of galvanized steel.

Video description

An example of finishing parapets in the following video:

Conclusion

Roof parapet – robust design, which serves to decorate the building, ensure the safety of people, including during high-altitude work, snow retention and resistance to wind loads. The product can be made of brick, block, or have a monolithic structure; often the parapet is made of metal or a combination of materials. Due to the increased requirements for structural reliability, installation should be entrusted to experienced craftsmen.

The parapet is an integral part of the roof of many houses, complementing their design. It has a certain height, which may vary depending on the situation. At the junction of this protective border with the roof, connection of the roof to the parapet, which must be followed according to all the rules.

Parapet device

Although the parapet is not one of the main parts of the house, it performs well the protective and aesthetic functions. This is a small wall that is installed around the perimeter of the roof and looks like an enclosing structure. This design is suitable for both pitched and flat roofs Oh. In the first case, the parapet is built above the cornice and is clearly visible from below. In the second case, a small barrier completely blocks the roof from view. So that the parapet is not damaged by precipitation and air currents, this elevation is covered with an apron, which can be made of galvanized or copper sheet metal. Structurally, it is equipped with special drips that drain water from the building. Drip pipes prevent water from entering protected areas of the parapet.

Note!
There are options for brick or concrete parapets, covered not with metal aprons, but with concrete slabs.

Principles of connecting the roof to the parapet

To make galvanized aprons metal sheets securely attached to the fence, grooves and niches are created in the parapet structure. The upper edges of the aprons, which are metal sheets bent into profile products, are inserted into these grooves. Aprons can also be used from black steel for roofing, but it must be painted on all sides using heated drying oil. Niches and grooves are provided for construction-necessary construction. It is known from practice that a single roofing sheet is not enough. This is due to the fact that vertical sections are not always level. In addition, on the mount negative impact render unstable temperature regime and precipitation. Due to these negative phenomena, the apron may not fit tightly to the curb. With the help of grooves these problems are solved.

• When the edge of a sheet made of one material or another is inserted into a niche, its height must be at least 0.1 m.
• If grooves are used to install the apron, the latter is sealed cement-sand mortar, which protects the structure from precipitation.

At a distance of 1 m from each other along the length of the parapet, install wooden corks, impregnated with antiseptic. Bars having a triangle shape in cross-section are attached to the plugs. The top of this structure is covered with an apron.

• The apron fragments are laid in the direction in which precipitation will flow, with an overlap of at least 0.1 m.
• If the roof is flat, then its junction with the fence is covered with waterproofing in several layers. Mastic waterproofing requires reinforcement. Geotextiles or glass-based materials are best suited for these purposes. During installation, an overlap of 0.15 m is made. The material is pressed against the vertical surface. Then the resulting structure is coated with emulsion or mastic. After the fastening agent has cooled, a second layer is laid on top of the first one. To prevent the layer cake from slipping, it is secured with a metal apron, which, among other things, serves protective function. The drawing clearly demonstrates how the junction of mating surfaces is arranged.

Connection device with soft roof

When connecting to a roof parapet roll type Special attention it is necessary to pay attention to waterproofing; it must be reinforced. When installing the roofing covering, the material must be placed on vertical wall. When laying the material at the junction of the surfaces, there must be a special support.

Note!
In the absence of an auxiliary side, a vulnerable cavity is formed at the junction of the roof and parapet surfaces. In this place, the flooring can be easily damaged under mechanical stress, resulting in depressurization of the coating.

• To avoid problems associated with damage to the roofing material, the joint between the surface of the roof and the parapet is laid with a supporting side, which has 2 angles of 45º in cross-section. Its construction is made from a mixture based on cement and sand. Instead of this support, you can place it impregnated with a bio- and fire-retardant agent. wooden block, which in cross-section has the form of an isosceles triangle. Thanks to this side, the coating material will adhere tightly to the entire adjacent surface.
• If waterproofing material is roofing felt, then using hot bitumen mastic The rolled material must be glued to the entire surface of the roof, starting from its base and ending with the parapet wall, including the side. After some time, the operation must be repeated, covering the roof with a second layer of roofing felt. During the construction of the parapet in its inner surface a special groove is installed. When connecting two surfaces, the edge of the roofing material with outside is inserted into the groove made. It is possible to have an adjoining unit with roofing felt placed on the upper section of the parapet.
• If the edge of the roofing strip extends into the groove, the material must be secured with a metal strip, which will press the roofing material against the wall using dowels. This part and the joint are sealed with sealant. The next layer will be paint, protecting the structure from precipitation. At the end, a metal apron is put on the parapet, which can be attached to the bar.
• In the option of installing roofing felt at the top of the parapet, roofing material first fixed with heated bitumen and then covered with an apron or slabs.

Parapet apron- one of the most important roofing elements, capable of high-quality and long-term protection of protrudingparts of the building subject to the destructive effects of precipitation. Standard parapet aprons are products made of galvanized steel sheet, having a U-shape in cross-section. They are installed on roof parapets, fences, and other protruding areas made of brick, concrete, foam block.

For the production of parapet aprons, sheets and rolls of galvanized steel with a thickness of 0.45 - 1.2 mm are used. The determination of a particular metal thickness is made by the manufacturer’s engineer based on calculations. To make the calculation, it is necessary to determine the parameters (dimensions) of the apron, the type of substructure, etc.

The apron is attached to a pre-installed subsystem, consisting of crossbars installed at intervals of no more than 600 mm.

VARIETIES OF PARAPET APRONS

There are a wide variety of options for making aprons and they are generally selected for each object individually, based on the size, direction of drainage, and other parameters. The most common apron options are listed below.

"FP-1"	"FP-2"
"FP-3"	"FP-4"

DETERMINING THE SIZE OF THE APRON

The first important step in installing aprons is taking measurements. For many, this procedure may seem complicated, but it is not so and we will try to consider in detail the specifics of this procedure.

1) Determining the width of the covered area

Roof parapets have a certain width, generally equal to the thickness of the building walls. If the facades of the building are made using ventilated facade technology, then to determine the width of the covered part, you need to sum up the width of the concrete part of the parapet and the width of the protruding facade system with cladding.

If the facades are made using the technology " wet facade“then it is necessary to add the thickness of the façade pie to the width of the concrete parapet (insulation, plaster, finishing coating). For open walls (without insulation or cladding), the width of the covered area is the net width of the parapet.

2) Determining the dimensions of the side shelves (drains)

After determining the width of the covered area, it is necessary to determine the dimensions of the apron drains (side shelves). The size of the side shelves of the apron is determined individually, based on the wishes of the Customer and the selected subsystem option.

An important aspect of determining the lateral dimensions is taking into account the height of the future subsystem and the required slope. Basically, side shelves are made from 70 -120mm.

3) Determining the length of the product

The length of the product is determined based on geometric parameters covered area (number of straight sections, corner sections). The best option The length of one apron is 2500mm.

4) Number of products

For correct calculation required quantity aprons, it is necessary to measure the total perimeter of the covered area. The resulting size must take into account the overlap of the products; the optimal overlap of one apron to another is considered to be 25-40mm.

So, to calculate the final width of the product, you need to take the width of the covered area and add 50 - 70 mm. (reserve width for the frame) and add 10 mm to the slope (difference). The slope should generally go towards the roof; an acceptable difference is 30-40mm.

INSTALLATION OF PARAPET APRONS

There are several options for installing covering elements on parapets.

• Direct fastening to concrete (brick base)
• Fastening to a load-bearing substructure

The choice of installation option is made by engineers based on the customer’s needs and site parameters.

Let us consider in more detail the option of installing aprons on a subsystem (frame):

The frame can be various designs and types, mainly supporting brackets and angles made of galvanized steel are used to assemble the subsystem. The frame allows you to perfectly level the covered area and give the necessary slope to the structure.

In the above installation unit for parapet aprons, the subsystem design consists of several components:

• Load-bearing bracket 50 mm (facade)
• L-shaped guide 40x40mm made of galvanized steel.
• Bracket anchor
• Blind rivets
• Roofing screws

The installation period for brackets and guides should be 400-600mm. This allows the parapet apron to be firmly secured.

DECORATIVE SOLUTIONS

Galvanized parapet aprons have special coatings, which are optional protective layer, and also add color to products. There are several main protective and decorative coatings:

• POLYESTER (PE)
• MATTE POLYESTER (MPE)
• PURAL (PU)
• PLASTIZOL (PVS)
• POWDER PAINT

Factory-produced galvanized steel sheets come in several standard colors, listed below.

Products that need to be given a different shade from the factory color are painted powder paint By

PRICES FOR PARAPET APRONS

Shelf width, mm	units change	Standard RAL colors	Other RAL colors (powder painting)
100	linear meters	110 rub.	150 rub.
150	linear meters	135 rub.	184 rub.
200	linear meters	160 rub.	218 rub.
250	linear meters	185 rub.	252 rub.
300	linear meters	210 rub.	286 rub.
350	linear meters	235 rub.	320 rub.
400	linear meters	260 rub.	354 rub.
450	linear meters	285 rub.	388 rub.
500	linear meters	310 rub.	422 rub.
550	linear meters	335 rub.	456 rub.
600	linear meters	360 rub.	490 rub.
650	linear meters	385 rub.	524 rub.
750	linear meters	435 rub.	592 rub.
800	linear meters	460 rub.	626 rub.
850	linear meters	485 rub.	660 rub.
900	linear meters	510 rub.	694 rub.
950	linear meters	535 rub.	728 rub.
1000	linear meters	560 rub.	762 rub.
1050	linear meters	585 rub.	796 rub.
1100	linear meters	610 rub.	830 rub.

Prices shown include VAT 18%

• Every homeowner strives for his home to be different from others in its beauty and originality. How a house will look externally sometimes depends on details that you might not even notice at first glance. But it is they who form the uniqueness of the external appearance of the home.

  Parapet for flat and pitched roofs

  One of the seemingly minor details on which the reliability and aesthetics of your home depends is the parapet on the roof. This is not a very high element, resembling a small wall, and serves to protect and enclose the roof. This design is suitable for roofs of any type - both flat and pitched. In the latter case, it starts from the eaves, covering part of it, and at this time the other part rises on the eaves and is perfectly visible, but the roof flat type the parapet hides completely. The shape of such a fence is in the upper part and can be horizontal or sloped. In any case, you need to keep in mind that the parapet on the roof may have a non-standard shape.

  

  To protect the fence from the destructive effects of atmospheric phenomena, a so-called apron is installed on top of it, which is made of metal profile, galvanized or copper. Its design requires the presence of special drip pipes through which water will be drained from the building. Thanks to the drippers, water ingress into the fencing structure is virtually eliminated.

  Often, for concrete or brick fences, the metal apron is replaced with concrete slabs or decorative rock, laid on top of them.

  

  In any roofing structure there are areas that pose a particular danger from the point of view of water leakage and corrosion. For example, the installation of a steel apron is carried out through fastening crutches, so all fastening points must be processed; the junction of the roof to the parapet, as it is especially susceptible to water leakage, must be reliably sealed. Joint seams between concrete slabs laid on top of the enclosing curb also require sealing.

  Connecting the roof to the parapet

  

  This connection is made by connecting the roof and the parapet with a side or front connection.

  Along the fence there are niches and curtains designed for installing aprons, for example, made of galvanized sheets of roofing metal, with subsequent fastening. The upper part of the metal sheets is inserted into these recesses. You can also use black roofing steel for these purposes, but only if it is painted twice on both sides using hot drying oil. The need for niches and curtains when making connections arises due to the fact that, as a rule, one roofing sheet of one type or another is not enough to ensure a reliable and tight fit. For example, due to its not entirely level vertical part or due to the destructive effects of precipitation, temperature changes, etc., the material may fall behind the curb.

  Connection device
  

  

  The technology for constructing these areas, depending on the presence of curtains or niches, is somewhat different.

  When the top part of galvanized or black roofing sheet is installed in a niche, its height should be at least 10 cm.

  In the case of installation in a curtain, it is sealed using a solution of cement and sand, which serves reliable protection from precipitation, for example, it protects the curtain from snow.

  Leaks in the unit are usually covered with roofing material.

  At a distance of 100 cm from each other, antiseptic wooden plugs are installed along the enclosing structure, and an apron is laid on them. Wood blocks with a triangular cross-section pre-attached to corks will help to press the edges of the apron more tightly

  The apron elements are laid in the direction in which the precipitation flow is directed with a minimum overlap of 0.10 m. The reliability of the assembly increases if the seam joints. The areas where fences and flat roofs meet must be additionally waterproofed, and in several layers. The main waterproofing, made of mastic, is covered with reinforcing glass material. Mount it with an overlap of 15 cm, pressing it through the intermediate side to a vertically directed plane. Then this entire layer is covered from bottom to top with mastic or emulsion. After allowing the mastic or emulsion to cool, the surface of the first layer is covered with the second. To prevent the mastic layers from slipping, they are fixed and protected from moisture using a metal apron.

  

  To fix the mastic layer of mastic, a metal clamping strip is used, which is nailed with dowels. Before this, the upper edge of the protective apron is placed under it, the elements of which are connected with a single fold.

  The connection to the parapet is also arranged on the roof with slopes, forming a valley. First of all, the base is primed and rolled fiberglass is spread over it. The rolled sheet is laid in the following sequence: the top of the pitched side, part of the valley horizontally. A layer of mastic or emulsion, at least in a strip of 10 cm, is applied to the inclined valley slope.

  Connection using the example of a soft roof

  

  Reinforced ones are required at the interface points. An additional concrete side is installed between the fence and the roof at an inclination angle of 45⁰. This makes installation much easier roll materials for waterproofing. A simple roofing material is glued to the required areas using hot bitumen mastic. After the first layer has hardened, a second one is applied to it. At the same time, the outer one is fixed using a metal strip, and a special apron is attached to it.

  Dowels are used to secure it, and after treatment with a sealant, paint is applied, which must be weather-resistant, providing protection to the assembly.