Gain rafter system usually required if during operation the roof cannot withstand the load and becomes deformed. As a rule, this is the result of errors in calculations or installation.

Increasing the load-bearing capacity of rafter legs

The rafter system of a house, garage, bathhouse and other buildings should be regularly checked for damage and deformation. Reinforcing the rafters in a timely manner will avoid roof damage and costly repairs. In the case of a garage, the car may also be damaged, which is associated with serious financial loss. Strengthening the load-bearing capacity of rafters may be required in any type of rafter system. For this purpose, the most common practice is to install unloading beams (“help”), install struts or double-sided pads.

If rafters are selected according to strength characteristics, they do not always have the necessary deflection indicators corresponding to SNiP “Loads and Impacts”. Thus, it is necessary to increase the cross-sectional area of ​​the rafters. Reinforcing thin wooden rafters of the roof of a garage or other building is done with the help of additional wooden beams - help. The beam is attached to the lower chord of the rafter in the span between the rafter leg and the mauerlat. A metal toothed plate or bolt clamps can be used as a fastening element.

Particular attention should be paid to strengthening the support unit of the continuous rafter leg on the strut.

At the point where the continuous rafter of the roof of a house or garage rests on the strut, the maximum bending moment occurs. It is necessary to avoid deflection in this unit, which requires increasing the cross-section of the rafter leg with overlays installed on both sides. The dimensions of the board overlays are selected based on the calculated parameters of the section at the maximum bending moment. Reinforcing the rafter leg with board overlays is done using bolted clamps or nails. If you increase the length of the support and move it beyond the edge of the support on the strut, then this beam will at the same time serve as an overlay, strengthening the support unit, in addition to increasing the rigidity of the span.

When reconstructing a roof, it is often necessary to make a steeper roof slope. In order not to completely replace the rafter system of a garage, bathhouse or residential building, new rafters are installed, fastening them to the old ones. The splicing of wooden elements is carried out using a cross board and nail wall. The resulting truss has a given slope and provides increased structural rigidity. It should be borne in mind that this approach does not allow increasing the space of the attic or attic when remodeling the roof.

Strengthening the lower part of rafter structures

To the most vulnerable parts truss structures garage, house or other buildings, include the lower parts rafter legs, resting on the Mauerlat, and the Mauerlat beams themselves. If raw lumber was used during the construction of structures, or the wood is moistened due to roof leaks or insufficient waterproofing between the Mauerlat and brickwork garage or house, the wooden elements rot and the strength of the structures decreases. Moisture ingress or condensation can also be caused by damaged vapor barriers, blockage or damage to ventilation ducts.

To strengthen the roof frame, additional struts are installed. Such a brace is attached to the bottom of the rafter and rests against a mauerlat beam or an additional beam. To increase the stability of farm structures, it is advisable to move the lower ends of the additionally installed struts slightly apart. By resting the struts on an additional support, you can remove the bending moment from the span between the rafter leg and the mauerlat.

Strengthening a damaged rafter system

If it is necessary to replace a rotten part of the mauerlat or sections of the rafters of the roof of a garage or other building, additional linings are used. Reinforcement with wooden overlays is performed in case of single damage to single rafters. The linings are fastened with bolts or nails, while the lower end of the lining should rest on the Mauerlat beam and be additionally fixed to it using twisted rolled wire.

Strengthening structures using bar prostheses is used in cases of massive damage to wooden rafters. In this case, strengthening involves dismantling damaged parts of structures. The damaged rafter leg is fixed on temporary supports, then part of the roofing covering is dismantled, and the rotten section of the rafter is cut out. A “prosthesis” is made from the new timber - an element whose dimensions correspond to the sawn piece of the rafter. The prosthesis is installed in place of the removed fragment, supported by the Mauerlat.

If strengthening structures requires partial replacement of the Mauerlat, strengthening the roof frame is carried out using the following technology. The rafter legs are fixed to temporary supports, and the rotted fragment of the mauerlat is dismantled. On the crutches driven into the masonry, it is necessary to lay a beam of a suitable cross-section, the length of which should be about 1 meter. A piece of timber of the same length is laid on the ceiling or wall. Then the rafter leg needs to be strengthened with two struts resting on the new beam.

Strengthening structures pitched roof implies a set of works aimed at correcting damage to wooden elements that have undergone biological destruction, or eliminating deformations of rafters and fastening points. Most often, you may encounter a problem such as deflection of the rafter legs during the operation of the roof, but you should also pay close attention to the quality of the rafter fastening even at the stage of erecting the roof of a garage or other buildings.

One of the fundamentally important nodes is the place where the rafters are attached to the roof ridge. If there are discrepancies, it is necessary to promptly correct this defect. The work technology may require the use of a jack to ensure a tight fit of the rafter leg in the ridge part. The place where the rafters join must be properly reinforced. Reinforcement is done using a perforated metal strip or a wooden overlay made from a board at least 2 cm thick. The overlay is mounted directly under the ridge.

Next, you should eliminate the deflection of the rafters. For this purpose, a hydraulic cylinder is activated. Using self-tapping screws it is recommended with inside rafters, attach wooden triangular supports. After which the rafter is straightened using a hydraulic cylinder and a rigid expansion bridge is installed, which prevents deformation of the roof truss under external loads.

To reinforce wooden rafter legs using the beam extension method, it is necessary to prepare a beam of the required width - it must correspond to the dimensions of the rafters, or slightly exceed them. Before you do reliable fixation reinforcing beam, this element is best secured to the rafters using self-tapping screws. Next you need to do a few through holes through the rafter leg and the reinforcing beam for fastening the elements with studs.

The holes should be staggered, with a pitch of about 30-50 cm. This principle of fastening makes it possible to increase the resistance of the structure under bending loads. The diameter of the holes must exactly match the diameter of the fasteners. Threaded rods are inserted into the prepared holes, wide washers are put on their ends and self-locking nuts are screwed on - this allows you to create reliable fasteners that will not come loose during operation of the rafter system. Tighten the nuts until the sound of cracking wood appears.

It will be necessary to strengthen the rafter system if during operation it turns out that it is not able to withstand the required load and begins to deform. Below we will talk in detail about how to strengthen the rafter system from the inside in order to eliminate all errors that were made during calculations before installation.

Strengthening the rafter legs

First, it is worth noting that the rafter system of a house, garage, bathhouse and other buildings must be checked in a timely manner for possible damage and deformation. Timely reinforcement of rafters will help prevent possible roof damage and huge repair costs. If the garage roof is damaged, the car may suffer. Rafter reinforcement may be required for any type of rafter system. To do this, expansion beams are often installed - “supports”, struts or double-sided overlays.

If the selection of rafters was carried out taking into account the strength characteristics, then their deflection forces will always correspond to the required indicators, which are regulated by the relevant SNiP “Loads and Impacts”. It turns out that we will need to increase the cross-section of the rafter legs. To strengthen thin rafters, wooden supports are used. They are attached to the lower chord of the rafters in the gap between the rafters and the mauerlat. In this case, the fasteners are steel toothed plates or clamps with bolts.

How to strengthen correctly and reliably - rules for strengthening a roof structure

Particular care must be taken in strengthening the element of support of the continuous rafter leg on the strut. This is because there should be no deflection in such a place, which means that the cross-section of the rafters is increased with the help of overlays that are installed on both sides. The dimensions of the overlays are determined based on the design parameters of the section with the maximum bending moment. Fastening of board overlays is carried out using bolted clamps or nails.

An installed support can also serve as an overlay if its length is increased and it is brought beyond the limit of support on the strut. In this case, it will not only give the span additional rigidity, but will also be able to increase the support capabilities of this unit.

In some cases, to improve performance characteristics roofs, steeper slopes are made for it. In this case, the old frame can not be disassembled, but a new rafter system can be assembled and connected to each other. Such strengthening of the rafter structures will make the new roof more rigid, but the under-roof space, which serves as an attic or uninhabited attic, but it will not increase. The structural elements can be connected to each other using rafter joints on both sides, secured crosswise.

Work to strengthen the rafter system

Most often, the mauerlat beams and rafter legs in their lower part are destroyed. This happens as a result of poor waterproofing of the Mauerlat from the brick wall due to the leakage of rain and melt water through the roofing, or due to the initial installation of insufficiently dried lumber. In addition, moisture ingress into wooden structures may occur due to clogging. ventilation ducts or violation of the integrity of the vapor barrier membrane.

You can reinforce the roof rafters in their lower part using auxiliary struts. These elements are fixed to the lower edge of the rafter leg with an emphasis on an additional leg or mauerlat. You can give the resulting truss additional stability if you slightly move the lower ends of the struts apart. If you place the emphasis of the strut on an auxiliary installed support, you can eliminate the bending forces between the Mauerlat and the rafter elements.

Repairing a damaged rafter system

To repair wooden rafters or mauerlat beams, additional pads are usually used. This method is used if single rafters are damaged. Such elements are fixed with nails or bolts, supporting the lining bottom onto the Mauerlat and screwing it with knitting wire.

When deciding how to strengthen the rafter system in the presence of numerous damages, rod prostheses are usually used. In this case, all deformed and unusable wooden elements must be removed. First of all, the rafter is fixed with temporary supports, after which a piece of roofing is dismantled and the damaged area is removed. In its place, a similar element is attached - a “prosthesis” made of fresh wood. For reliability, he must rely on the deer.

If it is necessary to replace individual sections of the Mauerlat, the work is performed in the following sequence:

• before strengthening the roof of the house, temporary support pillars are installed under the rafter frame;
• then dismantle the damaged piece of the Mauerlat beam;
• prepare a beam of the appropriate size (about 1 meter) and place it on studs located in the masonry of the wall;
• then a piece of timber of the same size is mounted on the wall or floor beams;
• at the end of the rafters they are additionally fixed with two struts, which rest on a new beam.

The question of how to strengthen the rafters arises in cases where it is necessary to eliminate defects wooden structures that appear as a result of natural wear and tear or loss of rigidity wooden frame and damage to its individual elements. As a rule, the rafter legs are the first to undergo deformation and begin to bend. This phenomenon can occur if, during the construction of a house or garage, the installation of gable roof rafters on a log house was not carried out according to all the rules.

The junction of the rafter legs with the roof ridge beam is one of the most important. If the slightest deviations are detected, the roof rafters should be strengthened in this place as quickly as possible. Sometimes a jack is used to tighten the rafters to the purlin or to each other. After this, the joint is properly strengthened with a perforated metal strip or a wooden overlay with a thickness of 2 cm. Such an overlay is installed under the ridge.

At the next stage, they move on to leveling the rafters. A hydraulic cylinder is used for this. Before strengthening the rafters and leveling them, triangular wooden stops are attached to them from the inside with self-tapping screws. After installing them, you can straighten the rafter leg with a hydraulic cylinder and install a spacer, which in the future will protect the roof frame from external loads.

Before strengthening the roof of a house by adding additional beams, you should purchase material of the required width (it should match or slightly exceed the cross-section of the rafters) and length. First, the prepared timber is attached to the rafter leg using self-tapping screws. After this, a series of holes are drilled through the timber and rafters so that these elements can be secured with studs.

The holes should be drilled with an indentation of 30-50 cm in a checkerboard pattern. Thus, an increase in the resistance of the frame to bending forces is achieved. The cross-section of holes and mounting studs must match. Threaded studs are threaded into the prepared holes, washers are put on and self-tightening nuts are tightened. They will ensure high-quality fastening and operation of the roof without the need to tighten the fasteners. You need to tighten the nut until the characteristic creaking sound of wood appears.

To increase the load-bearing capacity of rafter legs (Fig. 68), both in layered and hanging rafter systems, the installation of unloading beams (supports), double-sided linings and struts is used.

Rice. 68. Strengthening rafter legs with help

As calculations according to the old SNiP “Loads and Impacts” showed, rafters in the span between the mauerlat beam and the rafter leg with section dimensions selected according to strength characteristics often did not pass the deflection calculation and it was necessary to increase their height. You can make a rafter leg of variable cross-section by including an additional wooden beam- help. The support is attached in the span between the mauerlat and the rafter leg; its height is adjusted to the height of the rafter section so that it passes according to the calculation for deflection. The support is secured with bolted clamps or metal toothed plates.

Another dangerous knot in a continuous rafter leg is resting on a strut. Have you ever broken a stick over your knee? So, in this design scheme, the strut is that same knee; here the largest bending moment occurs, due to which it is necessary to increase the cross-section of the entire rafter leg. There is no deflection in this node, so you can increase not the height of the rafters, but its width, by attaching double-sided board overlays (Fig. 69). The width of the overlays is selected when calculating the rafter section for the maximum bending moment. The linings are fastened with nails, bolts or, as in the previous case, with bolt clamps. If the rafter is already reinforced with help, then it needs to be made longer and the edge should be brought out beyond the support unit on the mow. In this case, two problems are solved at once: strengthening the support unit and the deflection in the span.

rice. 69. Strengthening the support unit by increasing the width of the rafters

When reconstructing a roof under a steeper slope, new rafters are installed, merging them with the old ones (if they have not rotted) with a board and nail cross wall. New rafters can be introduced either on top of the old rafters or below them. The resulting truss provides not only a new slope, but also increased rigidity of the truss structure (Fig. 70). This method eliminates the need to disassemble old roof and speeds up the work, but does not increase the under-roof space. If the purpose of changing the slope of the slopes was to construct an attic, then the volume of the attic will remain the same.

rice. 70. Reinforcing rafters with a board-and-nail truss

Sometimes it happens that the end of the rafter leg rots and the support on the mauerlat becomes unreliable; in this case, additional struts can be attached to the lower end of the rafter leg, which rest against the same mauerlat beam or an additional support (Fig. 71). It is recommended to move the lower ends of the additional struts apart - they provide better stability to the rafters. And struts supported on an additional support can partially reduce the deflection of the rafters in the span between the rafter leg and the mauerlat. Additional struts are secured with nails and supported in the grooves on the rafters.

rice. 71. Strengthening the bottom of the rafter leg by installing additional struts

When raw wood (humidity more than 25%) is used in the construction of the roof and there is insufficient ventilation of the cold attic, with high dormer windows, their small area, or in the absence of attic vents, the lower end of the rafter legs or the Mauerlat may rot.

Also, rotting can occur if there is no or damage to the vapor barrier and air vents in the insulated structure mansard roof or clogging their ends. Either when the wood of the rafter legs and mauerlat in roofs of any type is moistened when the roof leaks, or when there is no waterproofing layer between the wood and the masonry of the wall and the wood is moistened from the masonry.

There are several ways to restore and strengthen damaged structures.

1. Use of wooden overlays. They are used for single damage to rafter legs. Reinforcement is carried out by installing reinforcing wooden overlays secured with bolts or nails. The support of the linings on the Mauerlat should be the entire end, followed by the installation of twisted wire (Fig. 72).

rice. 72. Repair of the unit supporting the rafters on the Mauerlat with overlays and prostheses

2. Use of rod prostheses. They are used for massive damage to rafter legs. Before work begins, the damaged rafter leg is strengthened on temporary supports, the covering is dismantled and the rotten part of the rafter leg is cut out. The prosthesis is put on the rafter leg and placed on the mauerlat. The sawn end of the rafter leg rests against the support platform of the prosthesis, which prevents it from slipping. The rigidity of the upper compressed belt of the prosthesis is ensured by the braced lattice.

3. Use of pads resting on the beam. This option is used if it is necessary to replace a rotten section of the mauerlat and the end of the rafter leg (Fig. 73). Before starting work, the rafter leg is strengthened with temporary supports, the rotten sections of the leg and the mauerlat are cut out, crutches are hammered into the masonry and a beam 1 m long is laid on them. If the design of the walls and ceiling allows, and most often this is the case, then a meter-long beam is laid on the wall or ceiling piece of bed. Two struts rest against this beam, secured to nails on both sides of the rafter leg. The sheathing is supported by a new elongated fillet.

rice. 73. Repair of the rafter support unit in case of damage to the Mauerlat

If there is insufficient air exchange in the attic, and as a result, the development of fungal spores and rotting of the wood of wooden roof structures, a number of measures are taken to restore ventilation (Fig. 74). IN attic you should study the nature of air movement, determine the air temperature at the upper boundary of the insulation (it should not exceed 2°C at any negative temperature outside air) and install additional vents and dormer windows. Sectional area dormer windows and vents should be 1/300–1/500 of the area attic floor. The width of the vents should be within 2–2.5 cm. It is necessary to measure and, if necessary, increase the thickness of the insulation to the calculated thickness. Caked insulation must be loosened approximately once every five years. For external walls with a width of up to 1 m, its thickness can be increased to 50% higher than the calculated one. The vapor barrier under the insulation layer should be checked and, if necessary, restored.

rice. 74. Device normal process air exchange in the attic roof

Reinforcements of other wooden structures, walls, floors and foundations can be viewed in a special section of the site.

Over time, wooden rafter structures can be damaged due to heavy snow loads, rot due to moisture, or become deformed due to errors in roof calculations or installation of the rafter system. Damage to the rafters may also be caused by the use poor quality material- damp, rotten boards with a lot of knots. In these cases, repair or strengthening of the rafters is necessary.

Also in the process of creating a rafter system, structural reinforcement is performed. This means the use of various racks, struts, jumpers that distribute the load. Without them, the rafter legs would have to be made very thick and heavy, which would increase the load on the walls of the building. Without such additional elements You can only get by in small buildings - garages, bathhouses.

What is the reinforcement of rafters?

May be required

• increasing the load-bearing capacity of rafters,
• strengthening the rafter legs in the lower part, at the junction with the Mauerlat,
• strengthening damaged rafters,
• increasing the roof slope angle and building a new rafter system,
• strengthening the nodes of the rafter system in case of poor-quality connection of elements.

To strengthen the rafters, beams and boards are used; they must be of the first grade and well dried. It's better to take conifers tree. Also, to fasten the elements of the rafter system to each other, you will need metal corners, perforated plates and wire.

How to increase the load-bearing capacity of rafters

The need to strengthen wooden rafters may arise if they are not strong enough to withstand deflection, even if their cross-section is suitable for the load that falls on them. For this they use

• unloading beams (assistance),
• struts,
• double-sided pads.

The supports are placed between the mauerlat and the rafter leg (strut). They are attached using bolts or special plates with teeth.

Double-sided overlays are used to avoid deflection of the rafter leg at the point where it rests on the strut. It is at this point that the maximum bending moment occurs. With the help of overlays, the cross-section of the timber in the problem area is increased. The covers are secured with nails or special bolts.

If the rafters are bent, they are straightened using a jack (hydraulic cylinder), and then strong horizontal struts are inserted to hold the connected rafters straight. This creates a design in the shape of the letter “A”.

Important! Before straightening the rafters, it is necessary to strengthen the place where they meet the Mauerlat so that the rafter legs do not jump off the beam while the jack is in operation.

Creating a new rafter system

Also, sometimes when reconstructing a roof it is necessary to make a new rafter system; with its help you can, for example, make the slope steeper. The need to increase the slope angle arises if snow accumulates on the roof and creates a large load on it. New rafters are installed above or below the old ones. In such cases, in order not to dismantle the old rafter structures, new ones are connected to them.

For the connection, a cross board-and-nail wall (truss) is used: new rafter legs are connected by cross-positioned boards to the existing ones. Most often, this method is used in layered rafter systems, which rest on a wall located in the center of the building. This technique cannot increase the height attic room.

How to strengthen the lower part of the rafters

Reinforcement of the rafters in the lower part is usually required at the junction with the Mauerlat. The lower parts of the rafter legs adjacent to the Mauerlat, and the Mauerlat itself are considered the most vulnerable parts of the rafter system.

To strengthen the rafters, additional struts are installed at the junction with the Mauerlat. They can rest either on the Mauerlat itself or on the bench. Sometimes it may be necessary to cut out the rotten part of the Mauerlat. Then the rafters are reinforced as shown in the figure.

The rafter is temporarily placed on supports, and the rotten parts of the rafter leg and mauerlat are cut out. Crutches are hammered into the wall and a beam 1 m long is placed on them. You can also put a piece of beam 1 m long on the wall or ceiling, this way the load will be distributed from one beam to two. Two struts are attached to the rafter leg on both sides, which rest against the mauerlat or bench.

The struts are attached to nails arranged in a checkerboard pattern. In this case, the struts are placed at an angle, as in the figure, in order to better distribute the load.

If the lower parts of several rafter legs have rotted, then they are temporarily installed on supports, the roof is dismantled, the rotten sections are sawed off, and then a rod (metal) prosthesis is made, which is put on the rafters and rests against the mauerlat. , thus resting on the prosthesis. The rigidity of the prosthesis is ensured by struts.

Replacing damaged parts

To replace rotten rafters, first remove roofing material on both sides of the house. In this case, the damaged part is cut out and the rafters need to be extended in length.

When replacing a horizontal beam, install temporary posts on which the horizontal beams will rest, then remove and save the posts that supported the damaged beam, replace the beam and place the posts back. Temporary stands are being removed.

If you need to replace the rack, then first install a temporary rack nearby, supported by a board at least 2.5 cm thick. Next, the damaged rack is removed, a new one is put in its place, then the temporary support is removed.

Strengthening the ridge unit

The connection of the rafters at the ridge is one of the most important units in the rafter system. It is important here that the boards fit together tightly. If you find that the rafters have separated at the ridge assembly, you need to join them using a jack and secure them using a wooden overlay (boards at least 20 mm thick) or a perforated metal strip that is attached under the ridge. You can also use special bolts.

Bay window connection

The bay window roof can be separate or connected to the main roof of the house. Its shape can be very diverse: gable, multi-gable, complex hip. The simplest option — gable roof. To construct a bay window roof, a mauerlat is installed around the perimeter. In brick or concrete houses The reinforcing belt is first poured, and the Mauerlat is installed on it.

The rafters for the bay window roof are thinner than for the main roof, since the load on them is less. They are installed in such a way that they protrude beyond the Mauerlat, forming a roof overhang. How to connect rafters in a bay window, watch the video:

The bay window can be included in the house design immediately or added later.

How to extend the life of rafters

The rafter system begins to rot due to moisture ingress, which can occur as a result of poor air exchange in the under-roof space or leaks. It is important to make a good hydro- and vapor barrier of the roof.

If the air exchange is insufficient - this can be checked by measuring the temperature at the upper boundary of the insulation layer; it should not be more than 2C at any temperature below zero outside - make additional air vents. The total area of ​​vents and dormer windows should be 1/500-1/300 of the roof area. If loose insulation is used, which tends to cake, then it is loosened once every 5 years. If necessary, the thickness of the insulation layer on the ceiling is increased; near the external walls it can be doubled compared to the calculated one.

Conclusion

By strengthening the truss structures, it is possible to eliminate deficiencies or damage that occurred during the operation of the building or during its construction. Most often, reinforcement is required at the junction of the rafter legs with the Mauerlat. To ensure that the rafters do not rot and serve for a long time, it is important to ensure good air exchange under the roof and use high-quality materials.

The Mauerlat has rotted. How to carry out repairs without completely dismantling the roof The Mauerlat serves as a support for the lower ends of the rafters. When the Mauerlat rots, additional struts are installed and the load is transferred to undamaged areas.

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Mauerlat is the most inconspicuous, but very important element roofs. It is the foundation on which the rafter system rests and distributes the weight of the roof over the entire surface of the wall. The Mauerlat is made of timber and attached to the unloading belt. In houses made of timber and logs, the functions of the mauerlat are performed by the upper crown of the log house. Mounting the Mauerlat on brick wall performed using studs embedded in the masonry. To protect against dampness, roofing material is laid over the unloading belt.

In order for the rafter system to be stable, the end of the rafter must rest on the Mauerlat with its entire plane. For this purpose, the interface unit is carefully adjusted and secured. When the Mauerlat rots, the rafter sags, the plane of the slope is disrupted, and leaks and aesthetic defects in the Onduville roof may occur. Further destruction of the Mauerlat leads to weakening of the rafter system and failure of the roof.

Local repairs to the Mauerlat can be performed without completely dismantling the roofing; in most cases, it is enough to open the eaves lining and remove several shingles over the damaged area. The main difficulty is to remove the nails without damaging the onduvil. For dismantling bitumen shingles You can use a nail puller, having previously placed a 40x150 mm board or a grinder under the paw, carefully cutting off the heads of the nails. The second method is much easier, but requires some skill.

If the size of the affected area of ​​the Mauerlat is small, repairs are carried out in the following sequence:

At a distance of ≈ 0.5-1.0 m from the mauerlat, bumpers made of boards with a cross-section of 50x150 mm are installed on the rafters on both sides. The hammers are attached to the rafters with nails;

Two struts are attached to the rafters, one end of which rests against the break, and the other rests on the mauerlat outside the rotten area. The struts are attached to the rafters using nails.

If a significant area is damaged, the struts are supported by an additional beam, installed as close as possible to the damaged mauerlat and secured to the wall or floor beams.

To prevent further rotting of the Mauerlat, it is necessary to remove the rotted wood, thoroughly treat the affected area with an antiseptic composition and eliminate the causes of rotting:

Waterproof the Mauerlat;

Treat the Mauerlat with an antiseptic composition;

Inspect the roof and eliminate leaks;

Provide effective work roof ventilation systems (clean the supply and exhaust ducts, bring their area into line with the area of ​​the attic, remove foreign objects and ensure the free movement of air masses);

On insulated roofs, you should check the serviceability of the vapor barrier and the efficiency of the ventilation system for the under-roof space.

After completion of the repair, the dismantled section of the roof is restored. The top shingles are carefully placed under the laid shingles and nailed through the old holes. Installation of the onduvilla at the repair site is carried out in accordance with the instructions.