Covering parapets (details about parapet slats). Incorrect installation of roofing material on the junctions Manufacturing and installation of folds on the parapet

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The parapet is presented in the form of a fence located on flat or pitched roofs and ensuring safe movement along them during repair work. Parapet designs can be any and depend directly on building requirements. So, what are parapets for, and how to install them correctly?

Parapet: purpose and varieties

Properly assembled roof parapet fencing reliably protects the roof from wind, with strong gusts of which even deformation and tearing of the coating is possible. The aesthetic purpose of the parapet is no less important - due to it, the roof of high-rise buildings is ennobled, blocks of air conditioning systems and other communications are hidden under it.

Depending on the structural features of the roof parapet can be:

On the high-rise buildings there must be an apron from precipitation from galvanized steel sheets, metal profiles, concrete slabs, copper caps. In construction practice, brick parapets are in high demand - they are laid on top of the finished roofing. In height, such a parapet should be at least 0.5 m, and inside it will pass roofing carpet, on top of which a special clamping bar is laid - as can be seen in the photo. To improve the strength of the structure, masonry can be performed with wooden or metal reinforcing parts. The installation of metal handrails is mandatory procedure, then due to them there will be at least 1.2 m.

Assembling the parapet structure

The metal parapet is mounted quite simply - from the main part, the so-called shelf, and figured or straight bends located at 90 degrees.

Rules for the parapet:

• parapets not lower than 1.2 m are installed on the exploited roofs;
• on a non-operated flat roof of a building that is less than 10 m, a decorative metal fence can perform the function of a parapet, and the absence of any fence at all is also acceptable; if the building is higher than 10 m, then the parapet is installed in without fail;
• where there is contiguity soft roof to the parapet, a waterproofing carpet is laid, and special crutches are used for fastening (more details: "");
• if PVC material or a TPO membrane is laid as a roofing, then an additional waterproofing carpet will be required to fix the dripper;
• if galvanized steel parapets are installed above 45 cm, then a protective apron is required, on top of which a clamping metal rail is attached to the screws and all joints are sealed (read also: "").

Coating the parapet with copper, in detail on the video:

Performing installation work

To build a parapet, you need to prepare in advance:

Upon completion of the work, a smooth connection of the enclosing elements and the roof is performed. To do this, the roofing is attached at an angle of 45 degrees to sand-cement mortar, then two layers of roofing material are placed on top of it, and the entire system is smeared with bituminous composition. Remember that the junction of the roof to the parapet must be carefully processed - the quality of the entire structure depends on this (more: "

The use of fences and roofing Parapetov

The parapet is for protection of roof ledges, foundations and fences from adverse weather conditions. Parapets allow water and snow to flow down to the ground and not accumulate on the ledge of the roof or foundation. Parapets significantly extend the life of fences and facades.The main material for the manufacture of parapets are galvanized sheets.

The parapets are divided into

Fence parapets

Roof and foundation parapets

Parapets are made in different forms factors and perfectly emphasize the style of the building, playing the role of the final element of the structure.

Listogib master manufactures straight parapets of any complexity and configuration. The term of production of a product from 10 minutes.

To calculate the price of manufacturing parapets, contact our manager, or use

The purpose of the parapets is the parapet, the final element flat roofs, fences and foundation ledges, it diverts water, preventing it from penetrating onto an unprotected concrete or brick surface. The parapet must be installed immediately after the completion of the main work on laying the roof or raising the brick fence, especially in winter time years, otherwise moisture will begin to destroy the structure very quickly.

Parapets are made on a special bending machine. Usually, thin sheets with a thickness of 0.45-0.5 mm are used. The sheet is cut to the size of the customer, then the blanks are given the necessary shape on the machine. In this article we will tell you how to properly install parapets.

To install parapets you will need:

• Screwdriver with a nozzle for a roofing screw
• Metal shears
• Sealant or bituminous mastic
• Roofing screws
• dowel

Installation of a parapet on a fence

To begin with, we will prepare the surface of the ledge, clean it from dust, cement and plaster residues. We try on ready-made parapets to the installation site, if nothing interferes, we proceed to the next stage of installing the parapet. Temporarily set aside the parapet. Next, we make a gate 1-1.5 cm on all columns with which the parapet will collide. We fill all the strobes with silicone in the color of the parapet slats. We cut the parapet to bypass the columns, then we drive the parapet into a gate and fix it on the sides with self-tapping screws. After installing the parapets, do not forget to remove the protective film.

Installation of a parapet on a flat roof

When installing a flat roof, a technological slope is created to drain water, for this reason, the installation of a steamer all the way into the roof cannot be done without gaps. In such cases, when installing a parapet for flat roofs, use double design. Thanks to this design, you can install the parapet in level, along the entire length of the roof. The method of mounting such a parapet is very simple, first the junction bar (skirt) is fixed to the vertical wall of the ledge, so that it adjoins the roof along the entire length without gaps and slots, if necessary, the joint of the bar with the roof is additionally sealed bituminous mastic or sealant. Further on top of the skirt, a standard parapet is installed and fixed roofing screws. The length of the overhangs of the parapet should be such that it overlaps the skirt by at least 1.5-2 cm. After installing the parapets, do not forget to remove the protective film.

Connection of parapets with a fold lock

Second way Castle connection of parapets(folded seam) is more troublesome, but at the same time the most reliable. There are several options for the seam connection of parapets. The most common option is a single recumbent fold is done as follows:

This kind of connection does not allow moisture to pass through even in the absence of sealant, which saves money during the installation of the parapet.

• Each homeowner strives to make his house different from others with its beauty and originality. How the house will look externally sometimes depends on such details that you won’t notice at first glance. But it is they who form the uniqueness of the external appearance of the dwelling.

  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, it serves to protect and enclose the roof. This design is suitable for any type of roof - both flat and pitched. In the latter case, it starts from the cornice, covering part of it, and at this time the other part rises on the cornice and is perfectly visible, but the roof flat type the parapet hides completely. The shape of such a fence in the upper part - and can be horizontal or pitched. In any case, you need to keep in mind that the parapet on the roof can also 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. In its design, the presence of special droppers is mandatory, through which water will be drained from the building. Thanks to the drippers, the ingress of water on the fence structure is practically excluded.

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

  

  At any roof structure there are areas that are particularly dangerous in terms of water leakage and corrosion. For example, the installation of a steel apron is carried out through fixing crutches, so all attachment points must be processed, the junction of the roof to the parapet, as it is especially prone to water leakage, must be reliably sealed. Sealing is also required for joints between concrete slabs laid on top of the enclosing curb.

  Attachment of the roof to the parapet

  

  Such an abutment is performed by joining the roof and the parapet with a side or front connection.

  Along the fence, niches and curtains are provided for the installation of aprons, for example, from galvanized sheets roofing metal, followed by fastening. These recesses lead upper part metal sheets. You can also use black for this purpose. roofing steel, but only if it is dyed twice on both sides using hot drying oil. The need for niches and curtains when connecting the device arises due to the fact that, as a rule, one roofing sheet one or another type to ensure a secure and tight fit is not enough. For example, due to its not quite flat vertical part or due to the destructive effects of precipitation, temperature changes and others, the material may lag behind the curb.

  Connecting device
  

  

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

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

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

  Joint leaks are usually covered with roofing material.

  At a distance of 100 cm from each other, antiseptic corks made of wood are installed along the enclosing structure, and an apron is laid on them. Pressing the edges of the apron more tightly will help wood bars, having a triangular section, previously fixed to the corks

  The laying of the elements of the apron is carried out in the direction in which the flow of atmospheric precipitation is directed with a minimum overlap of 0.10 m. The reliability of the assembly increases if the joints of the folds flat roofs be sure to additionally waterproof, and in several layers. The main waterproofing, made of mastic, is covered with reinforcing glass material. It is mounted with an overlap of 15 cm, pressing through the intermediate side to a vertically directed plane. Then, this whole layer is covered from the bottom up 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 layers of mastic from slipping, they are fixed and protected from moisture with a metal apron.

  

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

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

  Connection on the example of a soft roof

  

  Reinforced is required at the junction points. Between the fence and the roof at an angle of inclination of 45⁰, an additional concrete rim is arranged. This greatly simplifies installation. roll materials for waterproofing. A simple roofing material is glued to the required areas using hot bitumen mastic. After the first layer has hardened, the second layer is applied to it. At the same time, the outer one is fixed with a metal bar, a special apron is attached to it.

  Dowels are used to fasten it, and after sealant treatment, paint is applied, which must be weatherproof, providing protection for the assembly.

|| Building solutions. Types and classification of solutions || General information about roofs, roofing and the organization of roofing work. Roof classification || Preparation of the bases under a roof. Substrate surface preparation || The device of roofs from rolled materials. Preparation of roofing materials || Installation of mastic roofs. Roofs from bituminous, bituminous and polymeric and polymeric mastics || The device of roofs on panels of coverings of the increased factory readiness. Complete panels || The device of roofs from piece materials. Roofs from small-piece materials || Roofs from a metal tile. General information || Sheet metal roofing. Preparatory work || Roof repair. Roofs from rolled materials || Safety

Crate. All elements metal roofing- overhangs, gutters, grooves, aprons - arranged along a wooden crate 2 (Fig. 194). With a distance between the rafters of 1.2 ... 2 m, the crate is arranged from boards with a section of 50x200 mm and bars 4 with a section of 50x50 mm. Bars and boards are placed at a distance of 200 mm from each other.

Rice. 194. :
a - side view; b - part of the roofing; 1 - flooring boards; 2 - batten board; 3 - skating boards; 4 - bars; 5 - rafters; 6 - gutter; 7 - crutch; 8 - hook; 9 - tray

With this arrangement of the wooden elements of the crate, the foot of a person walking along the slope of the roof will always rest on two bars, which will prevent the deflection of the roofing. For device eaves overhang and wall gutters 6 lay a solid boardwalk with a width of 3-4 boards (700 mm). Along the ridge of the roof, two boards 3 converging with edges are laid, which serve to maintain the ridge joint. A solid flooring of boards is also arranged under the grooves (up to a width of 500 mm in each direction). By solid crate crutches 7 and hooks 8 for gutters are stuffed on the eaves. Thus, wall gutters rest on a solid part of the wooden crate. The lathing under the roof made of sheet steel should be even, without protrusions and recesses, the ribs and ridge should be straight, the front boards of the eaves overhang should be straight and hang from the eaves by the same amount along their entire length.

Overhangs. The cornice overhang (Fig. 195) begins to be arranged with the installation of pins with staples and T-shaped crutches. The pins 1 are located along the axes of the water intake funnels, and the crutches 3 are 700 mm apart from each other with tolerances of ±30 mm. The distance between the pin and the nearest crutch should be 200...400 mm.

Rice. 195. :
a - cornice overhang; b - the order of laying paintings; c - inserting a crutch into the flooring; 1 - eaves pin; 2 - boardwalk; 3 - T-shaped crutch; 4 - nails; 5 - covering the overhang with paintings (I-V)

The transverse planks of the crutches are placed at a distance of 120 mm from the overhang of the boardwalk 2. First, two extreme crutches are nailed, and one of the nails 4 on each crutch is not completely hammered. A cord is pulled between these nails, which determines the position of all intermediate crutches. Pictures I-V they are laid on top of the crutches along the roof overhang in such a way that their edge, having a lapel tape, tightly wraps around the protruding part of the crutch. The unfolded edge of the sheets on the opposite side is nailed to the crate with nails in increments of 400 ... 500 mm. The nail heads are further covered with a wall gutter. Pins, like crutches, are cut flush into the flooring and fastened with nails or screws. On the roof, the prepared paintings I...V are connected first for one half of the overhang between the funnels, then for the other. Pictures along the upper longitudinal edge are fixed with nails - three for each sheet. Laying paintings on crutches starts from the axes of the funnels (laying is also allowed from the watershed in both directions). To connect the paintings, one seam edge, lubricated with minium putty, is inserted into another and the seam is compacted with a mallet on metal rail; the ends of the droppers are overlapped. The connected pictures are alternately placed on crutches in such a way that their transverse strips enter into the limbs of the droppers. Paintings for covering the cornice overhang are connected on the watershed with a single lying seam. On the long side, which will be the edge of the overhang, make a bend of the lapel tape (drip), blocking the path of water and directing it down. The limb is also used for crimping crutches installed along the roof eaves.

Sheets of cornice overhangs are fastened with metal crutches, and gutters - with hooks, which are nailed to the crate. A drainage system is provided on the cornice overhangs in the roof structure. Water flowing down the slopes of the roof is discharged into the funnels downpipes located at the cornice overhangs at a distance of 12 ... 20 m from one another. To give direction to the water from the gutter into the funnel, a tray 9 is arranged (see Fig. 194), which is installed in the cutouts of the wall gutter 6. The sheet steel roof is attached to the crate 3 (Fig. 196) using clamps 2. One end of the clamps is nailed to the side wall of the crate bar, the second one is brought into the fold of the interconnected pictures 1.

Rice. 196. :
1 - paintings; 2 - clamp; 3 - crate; 4 - nail; I...V - the sequence of connecting pictures with a clamp

The gable overhang should protrude beyond the crate by 40 ... 50 mm. The overhang is fixed with end clamps, which are installed after 300 ... 400 mm. Together with the ordinary strip, they are then bent in the form of a double standing fold. Gable overhangs monumental buildings, as well as buildings built in areas with heavy winds, are fixed in the same way as cornice overhangs, i.e. on crutches with a device of lapel tapes with droppers. Roofing edges adjacent to stone walls, bent upwards by at least 150 mm. The edges of the lapels lead into furrows arranged in the masonry; there they are fixed with nails every 300 mm.

Gutters. At the end of the coating of the cornice overhangs, wall gutters are laid. Typically, the gutters are located between the water intake funnels with a slope of 1:20 to 1:10. Work begins with the installation of hooks 12 (Fig. 197), which are placed along the line marked for laying the gutter and beaten off with a chalked cord. Hooks are placed on top of cornice paintings 11 at a distance of 650 mm from one another.

Rice. 197. :
1 - pin with bracket; 2 - water intake funnel; 3 - tray; 4 - flooring grooves; 5 - rafter leg; 6 - cornice flooring; 7 - crate; 8 - picture of a wall gutter; 9, 13 - nails; 10 - crutch; 11 - picture of the cornice overhang; 12 - hook for the gutter; 14 - clamp

For the installation of a wall gutter on a mounted cornice overhang, the previously applied inclined lines AB (see Fig. 195) are restored on both sides of the watershed. Lighthouse hooks are installed on these lines at funnels A and on watershed B; their vertical bends should be on the indicated lines. Between the beacons (perpendicular to the line AB) the rest of the hooks are attached in the same way with a pitch of 670 ... 730 mm. Hooks 12 (Fig. 197) on the watershed are installed perpendicular to the cornice overhang and the line of wall gutters 8 (at a slight angle to the roof slope) and nailed with two or three nails. To connect a wall gutter with a row covering of a slope, an edge 20 mm high is bent in the gutter at an angle of 90 °. This is easiest done with tongs or with metal bar 500 ... 600 mm long, having on one narrow side a longitudinal slot 3 mm wide, 20 mm deep. So that there are no excessive thickenings in the connecting fold, corners are cut off in the bent edges. The lower longitudinal edge of the ordinary coating 2 (Fig. 198, a) in the process of assembling the ordinary strips is laid on a pre-made lapel in the wall gutter 1.

Rice. 198. :
a...e - bending sequence; g - finished gutter; 1 - gutter; 2 - ordinary coating; 3, 4 - folded edges; 5 - metal paw; 6 - mallet; 7 - comb bender; 8 - chisel (arrows show the direction of blows with a mallet)

After laying the coating, the hanging edge along the entire length is cut so that its width is no more than 20 mm. At the same time, the seam edges 3 and 4 are trimmed, resting on the lapel of the wall gutter (Fig. 198, b). With the help of a metal paw 5 and a mallet 6, the cut edge of the coating is folded down to the entire length of the seam connection (Fig. 198, c). Then the lower edge of the cover is tilted with a mallet and a comb bender 7 (Fig. 198, d). Then, with a hammer and a comb bender, the lower edge is bent inside the lapel of the wall gutter (Fig. 198, e), the fold is sealed with the help of a roofing chisel 8 and a mallet 6 (Fig. 198, f). In conclusion, the end corners are alternately dumped onto the ridge (Fig. 198, g). Following the laying of the coating on one slope, it is laid in the same order on the adjacent slope. After that, ridge bends are made (30 and 50 mm wide), followed by a single standing fold on the ridge. Rib folds on hip roofs are also made in the same way.

The prepared pictures of the gutters are collected, as well as the cornice covering. When making paintings, the direction of water flow is taken into account. The assembly is carried out from the water intake funnels to the watershed. The sides of the gutters are overlapped with each other, also taking into account the direction of water flow. At the same time, make sure that the upper edge of the paintings on the cornice is always located above the top of the gutter side. On the watershed and when joining at the funnel, the paintings are connected with a double lying seam. The sides of the gutters on the hooks are fixed with hooks. The upper longitudinal edge of the wall gutters is connected to the patterns of the ordinary coating with a seam seam. The tray is installed along the axis of the water intake area in such a way that its tail lapel is under the ends of the connected wall gutters. The lapel is fastened with four nails measuring 3x40mm. The sides of the trays and gutters are connected by corner folds, which are bent onto the inner planes of the tray sides (see Fig. 197, node II). Trays for water intake funnels, assembled in the corners of the roof of a building, are somewhat different from conventional trays installed on its eaves. If trays for cornices can be prepared in advance, then corner trays are usually made on the spot according to full-scale measurements. At the same time, the width of the pictures of wall gutters, their position relative to the cornices and the height of the sides are taken into account.

Suspended gutters (Fig. 199) are semicircular or rectangular trays that are hung directly under the drain edge of the cornice overhang. Hanging gutters 1 serve the same purposes as wall ones. The water collected by the gutters is diverted to the funnels. On the eaves, the gutter is positioned so that the water flowing from the slope does not overflow through its front side.

Rice. 199.
1 - gutter; 2 - tray bracket; 3 - roof; 4 - flooring; 5 - rivet; 6 - clamp; 7 - sunken screw; 8 - picture of the cornice overhang; 9 - nail; 10 - spacer (sections are given at points of maximum lift)

Before installing the tray brackets 2, the horizontality of the leading edge is checked by level. Staples are attached in this sequence. First, two extreme (beacon) brackets are installed, a cord is pulled between them and a cord is marked along it and cut into the flooring 4 - a plank base - steel brackets. The gutter raised on the eaves is laid on tray brackets 2 and fastened with clamps 6. To avoid the consequences of expansion of the gutter during temperature fluctuations, compensators are arranged in it or movable seams are made. The compensator is a water intake funnel, which includes freely laid ends of hanging gutters on both sides. This design of the gutter allows it to freely lengthen or shorten by 10..15 mm, which is quite enough for temperature changes at different times of the year. A movable seam is made at the point of the highest rise of the gutters. Here, the end ends of the gutters are sealed with tin plugs. A temperature gap of 30 ... 40 mm is left between their ends. Both ends of the gutters are closed on top with a tin lid (two slopes), through which water flows down to the ends of the gutters. In some cases, you can limit yourself to rigid fastening of the gutter to one of the brackets located in its middle, leaving the ends only movably fixed in clamps.

Inlet funnels make round or rectangular shape. In both cases, one or two holes are arranged in them for the entry of gutters. The funnel is attached to the eaves with a standard pin with a clamp. It is recommended to additionally fasten the lapels of the funnel rim with rivets to both sides of the tray. After that, the pictures of the cornice layers are laid (if they are provided) and proceed to the coating.

Collars for pipes. Check that all wooden elements the battens and roofs adjacent to the chimney shaft, according to fire safety standards, were 130 mm from the surface of its walls. The collar, consisting of two halves, is assembled in the otter of the pipe head. The first from the side of the eaves is brought down by the lower half, which is fixed with nails. Then, from the side of the ridge, the upper half is brought in so that its lapels overlap the lapels of the lower one along the water runoff by 200 mm. The vertical lapels of the collar are connected to each other on both sides by bent strips. From the side and ridge sides, the collar is fastened with clamps every 500 mm. To avoid stagnation of water in the annular part of the trunk, when harvesting, one size of the upper half of the collar is made larger than the other by 5 ... 6 mm. During assembly, special attention is paid to the integrity of the seams and the quality of the soldering of the corners. Chimney can be located on the roof both in the transverse and in the longitudinal direction relative to the ordinary strips. If the transverse side of the pipe is more than 500 mm, then from the side of the ridge, a stripping of boards in the form of a gable roof is arranged. The formwork is covered with paintings, the lapels of which lead into an otter. Pictures with ordinary stripes are connected by recumbent folds. All lapels are inserted into the pipe otter with the expectation that a collar 150 mm high in the annulus and 100 mm high in the lower part is formed from them.

Parapet walls and firewalls covered with pre-prepared narrow paintings, on longitudinal edges who are satisfied with lapels with droppers. The paintings are connected with recumbent folds, and they are attached to the walls with wire, which is passed through the holes in the edges of the paintings and fixed with nails (3.5x45 mm) driven into the seams of the masonry. To concrete blocks they are fastened with dowels.

Covering dormers. Dormer windows are different sizes, forms and advance their elements do not. As a rule, dormer window covering patterns are made only after the installation load-bearing structures roofs (rafters, battens) based on accurate field measurements. Dormer windows with a base diameter of up to 1 m are usually covered with one picture, larger than 1 m - with two. They begin work with measurements of the crate, i.e., set the diameter of the base of the window D (Fig. 200, a), the length of the semi-cone along the slope l "and the length of the semi-cone along the ridge B. Then they make a drawing of the window (front and side view). Half of the semicircle of the window are divided into three equal parts and the division points are marked with the numbers 1, 2, 3, 4. The points on the circle are transferred to the vertical straight line of the side view of the window, marking them with the numbers 1", 2", 3", 4. Segments 1 "-O" (l), 2 "--O", 3 "-O" and 4 "-O" are auxiliary lines on the conical surface of the window. The segment 1 "-O" (l) is the true length of the half-cone.

Rice. 200. :
a - front and side view of the window; b - graph for determining the true dimensions of the auxiliary lines on the conical surface of the window; c - development of the spherical part of the coating; g - blank; 1...4 - sweep of the arc; D - diameter dormer window; l and l "- the length of the semi-cones along the ridge and slope

To determine the true dimensions of the segments 2 "-O", 3 "-O", 4 "-O", build an auxiliary graph (Fig. 200, b). On a horizontal line to the left of point 1 "set chords 1"-2", 1-3 and 1-4 and the corresponding points are marked with numbers 2", 3" and 4". On the vertical from the same point 1 "lay the segment 1"-O", i.e. the length of the ridge l. The points on the horizontal 2", 3" and 4" are connected by a dotted line with the point O". The latter will represent the true values ​​​​of the segments 2 " -O", 3"-O", 4"-O" (l").

The deployed lengths of arcs 1-2, 2-3 and 3-4 are determined with a measuring compass. The measurement will be more accurate, the smaller the solution installed between the legs of the meter. The results of the measurement are laid off on a straight line 1-4 (Fig. 200, c). Then build a spherical scan. From point O "(Fig. 200, c) with radii equal to the true values ​​​​of the length of the auxiliary segments, four serifs are made in sequential order. From point 1" with radii equal to deployed arcs 1-2, 1-3, and 1-4, make the second serifs and intersection points are marked with the numbers 2", 3" and 4". Figure 1", O", 4" - the desired sweep of half the semi-cone.

On the workpiece assembled from sheets (Fig. 200, d), scan contours 1 ", O", 4 "are applied, after which a triangle O" A4 "is drawn to the side O" -4 ", which is the coating of the slope adjacent to the window. Triangles draw, drawing serifs from points O "and 4" with radii D / 2 and l ". The intersection point is marked with the letter A. In conclusion, a rectangle 150 mm wide is drawn to side A-4 ". Thus, a picture is obtained for half of the dormer window, to which allowances for the overhang and seam edges are added. Then the sheet is cut. The second picture is also performed, which, together with the first, must form a pair.

The collar of the dormer window (Fig. 201, a) is made up of three aprons: the front one (Fig. 201, d) and two side ones (Fig. 201, b). They are marked according to the natural measurement of the base of the window. Angles a and a1 are easier to outline in place on the cardboard. Aprons are prepared on a workbench using a mandrel bar and a mallet. The blank of the side apron (Fig. 201, c) has a horizontal part equal to 50 mm, a vertical part - 150 mm.

Rice. 201. :
a - window with original dimensions; b - side apron; in - preparation of a side apron; g - front apron; e - preparation of the front apron; l - the length of the side wall of the window (along the slope); b - window width; b "- the width of the apron; h - the height of the lower trim of the window frame; l" - the length of the fold; a - the angle between the front wall of the window and the roof slope; a1 - the angle between the slope of the dormer window and the slope of the roof; a2 - the angle between the window frame trim and the rebate

The lapels of the front apron (Fig. 201, e) are folded down gradually: first, the short side ones, then the long one located between them (c). Simultaneously with flexible pliers, breaks are made dihedral angles a2, in adjacent triangles along the legs indicated by dots and dash-dotted lines. In the process of bending, triangles are placed on the planes of the side flaps, as shown in fig. 201, g. The lapels to be joined are cut so that the front lapel overlaps the edge of the side apron bent at 90 °. After that, the connection is fastened with two rivets and soldered. Side apron (Fig. 201, b) is prepared in this sequence. First, the longitudinal edge is bent, and then the strip laid on the crate. Narrow edges (shaded in the figure) are bent as follows: short on a plane, long at a right angle. The side aprons are bent so that a pair is obtained, i.e. one right and one left.

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When installing a roof important element is a galvanized parapet, more precisely a special apron made of sheet metal, which is made to protect the parapet assembly from precipitation, and also has decorative purpose, but this is a secondary point.

A galvanized apron (sometimes called a parapet cover) is most often designed with droppers set aside from the walls, so that the parapet assembly is reliably insured against moisture getting behind the waterproofing carpet.

The roof parapet avoids the quick repair of the roof and facade of the building.

Here you can order the manufacture of galvanized aprons for any type of parapets ().

The photo shows the most common type of roofing apron, made of thin sheet, galvanized metal with polymer coated, RAL color 9006.

It is also possible to manufacture additional stiffeners to give the galvanized parapet additional resistance to wind loads, which are high altitude can be quite significant.

Seen in the video below improperly made and assembled galvanized parapet under the action of wind loads.