Our article is devoted to the description of such an issue as the overhaul of a soft roof and its technology. This topic is of great interest among people seeking to repair the roof on their own, therefore here we will touch on the topic of types of repairs and the features of its implementation.
There are several ways to repair a soft roof, and they all depend on the amount of damage to the roof and the level of their complexity.
There are two types of repairs:
- Current. This is when the trouble roofing account for less than 40% of overall size roofs.
- Capital. When the total component percentage of errors from the roof area is more than 40%.
It may seem strange, but the main reason for the leakage of a roof consisting of soft roll material is the destruction of the bituminous layer. It is he who provides protection for this material with its waterproofing properties.
Experienced experts advise every two or three years to check the roof for various cracks and blisters, and not at all (as many do!) Moisture seeps into the room. If you adhere to this rule, then you will not have to make major repairs to the soft roof for a long time. By checking and detecting problems in time, you can limit yourself to the usual “micro-repairs” and in this way save both time and waste.
As for the process of repairing soft roofs, it is not so complicated in its implementation. Of course, if there is a need to repair the roof of the house on your own, then the technology for repairing a soft roof will be somewhat more complicated and will require more of your time and effort than repairing a roof, for example, a garage.
And a few words about the material: the most simple in terms of installation (especially with your own hands) are considered to be rolled roofing, since they just do not require special skills and installation equipment.
Roofing materials and their device
We found out that the repair of a soft roof begins with determining the amount of damage to the roof. To do this, you need to do a simple thing - go up to the roof and carefully inspect the entire coating.
By doing this, you can find the following problems:
- Delaminations located at the junctions of the material webs, as well as in overlaps.
- Various pits and depressions in which water is retained.
- Rotting of material in places of water accumulations.
- Moss and fungus (in the same water places).
- Penetration of moisture. You will find out about this if you find swellings on the surface of the roof cover.
- Visible mechanical problems: tears, cracks, abrasions.
So the inspection was done. Now we draw conclusions and determine what type of repair the roof of the house needs.
Next, we move on to next step- drawing up a budget. An estimate for the repair of a soft roof does not have to be drawn up by specialists. This can be done on your own, but only if you are completely confident in the correctness of your roof repair decisions.
What does the estimate include
We will provide a list of works that are compiled by specialists in the repair of soft roofs and which must be completed first:
- Completely or partially remove the old roof.
- Prepare the surface for the installation of the roof covering.
- Carry out work on the installation of the top layer and coat the seams of the roof.
- Consider the cost of the top waterproofing layer.
- Prepare combustible materials for the burner.
- Take into account expendable materials for repairs and their delivery.
If you decide to do the repair yourself, then the estimate for the repair of a soft roof may include only the price and delivery of the material that you plan to use.
If you are in doubt whether to do the repair yourself or hire workers, there is a third option - contact a roof repair company.
How much will the repair cost?
This question occupies those who wish to repair a soft roof with their own hands no less than The right way roof repair. The information provided will help you find out approximately how much you will need to spend on repairing a soft roof.
The first is drawing up a roof plan with its exact dimensions. This is necessary in order to calculate the amount of material required.
The second is to find out the parameters (length, thickness, height) of the parapets and adjoining walls, as well as the length of the cornice overhangs.
If there are shafts on the roof, then you need to find out their number and their size. The same actions apply to pipes and other various elements if they are present on the roof.
Another point is to find out the condition of the roof and it is desirable to take photographs at the same time.
To calculate the funds spent on repairs, you also need to draw up an approximate list of work required for repairs.
And the last - part of the costs depends on what kind of material you will use for repairs.
Overhaul stages
In order to repair a soft roof with their own hands, masters with experience advise you to learn a few immutable rules that many self-taught masters do not follow and, as a result, regret about it. But it's not always their fault. The fact is that most of rules for SNiP, which are observed during the repair of roofs, were developed in Soviet time. But, as you may have guessed, a lot has changed since that time - new materials have appeared, modern technologies have been developed.
And therefore, we hasten to assure you that if you have knowledge and confidence in what you are doing, these rules will not be useful to you at all. And if the repair is carried out by specialists, then it will be completed efficiently and quickly without peeping into the “cheat sheet” of SNiP.
So, repair, as well as the installation of a soft roof from scratch, must begin with the preparation of the base, since the material will be laid on it.
The current repair has several options. Can be done partial replacement(patches) and repair "in the old way", when one or a couple of layers of new material are laid on the old cover.
In the case of using patches, it is necessary to remove all defects in the places where they fit. After the surface is cleaned of dust, debris and filled with sealant or bituminous mastic.
Remember: the dimensions of the material must be larger than the dimensions of the surface to be repaired.
The edges must be well smeared with bituminous mastic.
It's worth saying that this method gives poor quality results. But the repair "in the old way" is much more in demand among developers.
Repair of a soft roof, the technology of which consists in laying the material according to the old method, is easier - without removing the old cover.
Here you need to remember that the presence of two more layers will increase the load on the roof, so first you need to find out if the floor and wall supports are able to bear such a weight!
Example: average weight modern materials- 4-5 kg / m2, with a roof area of 1000 m2, the load on it will increase by 5 tons.
Soft roof: repair
First, the roof is cleaned of debris, dirt, etc. The new layer is covered in the usual way. But remember that this method it is better not to apply in case of severe damage to the old cover or if there are already more than eight layers of material on the roof.
Capital repairs of a soft roof include the following processes:
- Replacement roofing material.
- Repair of parapets, foundations (screeds).
- Replacement of cornice overhangs.
- Replacement of aprons adjoining and fencing.
- Repair and revision of drains and water intakes.
And if the roof of the house is too neglected, then you will not be limited only to repairs. It will have to be built practically from scratch, which in one way or another will affect the cost of the work.
Here's what the overhaul looks like:
- Removal (removal) of the old coating.
- Foundation repair.
- Waterproofing installation.
- Execution of a screed.
- Laying material intended for roofing.
- Laying a protective layer.
And here is a list of things that will be needed to complete these works:
- Gas-burner.
- Roofing material.
- Mastic bituminous or sealant.
- Knife (to cut roofing material).
- Broom (to clean the surface).
- Cement (for screed).
- Insulation.
- Overalls.
Do not confuse a gas burner with a blowtorch! According to professionals, using a blowtorch to heat the material, you will spend significantly more time than using a burner.
Now consider the overhaul of a soft roof in more detail.
To perform the first stage - the removal of the old coating - you can use special equipment that removes and immediately rolls the coating into a roll.
Another option is an ax, where the wooden handle is replaced with a metal one. At the same time, its length determines the growth of a particular person.
After cleaning the surface, you need to check the base for dents, cracks, etc. If they are absent, the screed does not need to be poured.
In some cases, the screed is preceded by a heat-insulating layer, such as foam or gravel.
When the cement has hardened, we proceed to laying the material for the roof. Despite the differences in the composition of the soft roof, it is better to use fiberglass materials. Unlike cardboard coverings, materials based on fiberglass are more durable and have high technical qualities.
Start laying from the bottom edge of the roof. Each next row is overlapped - from 10 cm. The amount of overlap will depend on the angle of the roof slope.
Then the seams must be treated with bituminous mastic. After waiting a while, you can proceed to the next layer. It is laid in such a way that the seam of the previous coating layer does not coincide with the seam of the next one.
Ruberoid, glassine and roofing paper also require the installation of a protective cover, which is made from bituminous mastic. After it is sprinkled with crumbs of stone and rolled with a skating rink.
It is better, of course, to resort to materials of a new generation, which are already covered with protective dressing and allow you to refuse to coat the seams between the rows. Thus, less material is wasted.
Here, in principle, is the whole technology of repairing a soft roof - as you can see, it is not difficult. Run this work two people can calmly, and the choice of material for coating is completely up to you.
And one more thing - remember that the revision of the roof cover (at least once every three years) and the removal of minor errors will save you from problems such as complete overlapping of the roof, roof leakage during the rainy season, as well as from such an undesirable circumstance as urgent repair soft roof in winter. Good luck to you!
Roof of a residential building
The main cause of damage and deformation of soft roofs is operational wear. In some cases, defects may be caused by installation or maintenance errors. Regardless of the reason that caused the violation of the integrity of the coating, the repair of soft roofing should be done as soon as possible. This will help to avoid complete dismantling old coating and refurbishment of roofing material.
Prevention
To delay the need repair work, should be observed preventive measures to protect the roofing:
- During operation, the roof slopes may sag. The reason for this is the excessive load that the soft roof is subjected to. The load may be the result of errors during the installation of the roofing or the result of rotting and deformation of the beams on which the roof rests. The load is caused natural phenomena. In Moscow and other regions of Central Russia, it is often caused by snow. Therefore, the soft roof should be regularly cleaned of it, as well as dirt and debris.
- Roofs should be cleaned periodically clean water supplied under pressure. After washing, the surface is treated special formulations protecting the outer layer of the roofing cake from moss and mold. It is sufficient to flush once a year.
- Additional preventive measures are required in regions with high humidity. Roofs of houses in such areas are additionally protected. For example, a zinc strip can be installed near the ridge.
- AT winter period in Moscow and Central Russia, it is necessary not only to regularly remove snow and icicles, but also to treat the surface with chemical compounds that prevent the accumulation of snow and the formation of an ice crust.
- If trees grow near the house, it is necessary to cut off the branches hanging over the roof. The distance between the nearest tree branches and the roofing should be at least one meter.
These measures avoid frequent repairs soft roof.
Defects
It is necessary to start repairing a soft roof if at least one coating defect was found during the examination. These include:
- Mechanical damage to the roofing pie.
- Presence of plants, moss or mold.
- Swollen areas.
- Flaking of roofing material.
- Cracks.
- Damage to previous patches.
Any of these defects requires immediate intervention and repair of the soft roof surface. Otherwise, they will cause roof leaks.
Roof installation
Depending on the frequency of occurrence of leakage, there can be different types:
- Manifested immediately after precipitation. Most often, leaks of this type are caused by mechanical damage to the roofing pie or natural wear and tear. If a leak appears immediately after installation or repair of the coating, we can say that the work was done in violation of the technology, or poor-quality materials were used.
- Appearing some time after the snow melts. Such leaks may indicate that there are mechanical damage or cracks.
- "Flickering" leaks that appear periodically. They are caused by microcracks in the coating. When flickering leaks appear, a major overhaul of a soft roof is most often required.
Even if there are no leaks, the roofing should be inspected regularly. The purpose of such a survey is spring period are:
- Detection of blisters, determination of their size and nature.
- Assessment of the state of waterproofing roofing.
- Determination of the integrity of the aprons and the correctness of their installation.
Preparation for work
AT summer period the following defects can be found:
- Bubbles in the coating.
- Cracking of roofing material of varying degrees.
In the fall, the following are revealed:
- Clogs in funnels and drains.
- Wet walls.
- Stagnation of water.
Repair Technology
Repair of a soft roof can be current or capital. Overhaul requires the complete dismantling of old materials with the arrangement of new hydro-, vapor barrier, screed, etc.
The choice of materials for repair
On the construction market A variety of materials for the repair of soft roof coverings are presented in Russia and Moscow. The roofing pie is arranged in several layers. Materials must meet a number of requirements:
- For the outer layer, you need to choose products with mineral dressing and a thickness of 4.5–5 mm.
- For the lower layers, materials with a thickness of 3–3.5 mm are suitable.
- All textures used must be compatible with each other.
Installation by non-professionals
In Moscow and Central Russia, bituminous roll materials have gained the greatest popularity. They are easy to install, especially on flat roofs, and can be used for roofs of residential and industrial buildings. In terms of coating reliability, bitumen-based roll materials are superior to most other methods of arranging a roofing pie. Such materials are well suited not only for Moscow with its relatively stable climate, but also for areas where there are sharp temperature changes.
Maintenance
Current repairs are carried out with minor damage, cracks or open joints. Cracks and mechanical damage can be eliminated by filling them with bituminous mastic, on top of which a patch is glued. Roll roofing materials are selected for it. On top of it, it is desirable to pour another layer of bitumen.
Opened joints are also treated with bitumen. Before pouring the mastic, you need to thoroughly dry the lower layers of the roofing cake. gas burner. After drying, bitumen is poured, on which old material, and another layer of mastic is performed.
Overhaul
Work completed
Roof overhaul - difficult task, the implementation of which is best entrusted to specialists. Moreover, in Moscow and other large cities it is quite easy to find a specialized company providing such services.
Repair is carried out in several stages:
- Dismantling of the old roofing pie.
- Implementation of a cement screed roof.
- Arrangement of steam and waterproofing layers.
- Laying of rolled roofing materials.
Violation of any of the stages of the technological process will lead to the fact that the soft roof will be quickly damaged, and all problems associated with leaks will return, requiring a new repair.
You need to start repair work with surface preparation. The roof must be cleared of debris, and the old roofing completely dismantled. The base of the roof must be level. Next, the operability of the ventilation and drainage systems is checked.
On flat roofs, it is necessary to perform a cement screed, which ensures the evenness of the surface. For additional protection, the base is primed bituminous primer or mastic. First, the composition is applied completely to the entire base, including parapets, junctions and podiums. In this case, the surface must be thoroughly impregnated with a primer. After the material has dried, the next layers can be laid.
Mounting process
The vapor barrier is mounted on cement screed and then a layer of insulation is laid. To protect the resulting cake, reinforcement with a road mesh is used. Steam and thermal insulation materials selected depending on the design of the roof.
Materials are stacked different ways depending on the angle of the roof slope. On roofs with a slope angle of less than 15º, the materials must be installed perpendicular to the direction of water movement when it flows into drainage system. At an angle of more than 15º, laying is carried out from top to bottom in the direction of water movement. After laying the roofing material, all joints, elements of the parapet, gutters, etc. are sealed.
Repair work in winter
Roof repairs in Moscow and Central Russia during the winter period are impossible. In fact, all work in the event of leaks comes down to patching the damaged area. The area to be treated is dried with a gas burner, after which a patch is deposited on the surface. required size. With the onset of the warm period of the year, the roof is carefully examined, and current or major repairs are carried out, which depends on the degree of damage to the coating.
Conclusion
Repair of a soft roof is required when the slightest defects in the coating appear. Despite the relative ease of laying rolled bituminous weld materials, the work must be carried out by specialists. One single violation of the technological process, which may seem insignificant to a non-professional, can lead to rapid wear of the new coating, and in the worst case, reduce the result of the work to zero.
Repair of a soft roof is necessary when the first defects are detected. Otherwise, leaking water will destroy the insulation, render the hydro and vapor barrier unusable, and you will have to spend more effort and money on restoration.
Final cost restoration work depends on the type of soft roof. It is known to put in order roll coating much cheaper than restoring shingles.
The price of all events depends on the chosen repair option:
- Cosmetic restoration includes the elimination of minor defects - divergence of seams, holes, dents and swelling.
- Capital works consist in the complete replacement of existing material with qualitatively new components.
- Emergency repair is carried out when it is impossible to qualitatively eliminate the damage due to weather or other conditions. The main thing here is to fix the problem, and not to preserve the appearance.
The appropriate type of measures to be taken is determined on the basis of an internal and external inspection of the structure. This will reveal the most problem areas and focus on them. 
cosmetic work
Cosmetic repair allows you to return a beautiful appearance roof and at the same time fix the leak. They resort to it in cases where the water has not spoiled " roofing cake». 
Defects are usually eliminated in two ways, depending on their type:
- cracks and holes are eliminated by applying patches and subsequent application of mastic or bitumen;
- the separated joints are again glued with roofing glue on both sides - top and bottom.
More difficult to repair soft roof with swelling. The reason for this phenomenon is the penetration of moisture into the insulation. To eliminate the defect, the heat is replaced and a new layer of waterproofing is laid. Air ducts are also constructed to circulate air and remove moisture. 
Capital recovery
Major repairs are required in case of extensive damage to the roofing, when it makes no sense to partially close up the holes. Measures are also taken due to the aging of the material. 
In this case, the work consists of several stages:
- Dismantling old system- removal of not only the roof, but also the "pie".
- Drying of all structural elements, processing wooden elements antiseptics.
- Laying a vapor-permeable membrane, insulation and waterproofing.
- Roofing installation.
Major repairs may be needed for extensive swelling. In that case, in technological process laying work included ventilation ducts with the installation of aerators, gaps are left for air circulation. 
Here are the main aspects of repairing a roof from a soft roof. The number of activities and the complexity of the work depends on the type roof truss, surface area. And if you want to save money and carry out a quality restoration, then contact a professional company.
The price of repairing a soft roof
| Types of jobs | Units | Prices: |
| Complete disassembly existing roof(waterproofing coating, screed, insulation) with garbage disposal | m2 | 250 rub. |
| The device of a two-layer roofing carpet with welded roll material on a vertical surface | m2 | 350 rub. |
| Thermal insulation device from slabs 150 mm thick | m2 | 200 rub. |
| Device cement-sand screed up to 50 mm thick | m2 | 300 rub. |
| Reinforced cement-sand screed up to 50 mm thick | m2 | 350 rub. |
| Priming the base with a primer | m2 | 100 rub. |
| Deceleration device made of expanded clay with an average thickness of 100 mm | m2 | 200 rub. |
| Vapor barrier device built-up single-layer | m2 | 150 rub. |
| Dry vapor barrier device | m2 | 80 rub. |
| Installation of drain funnels | m2 | 2000 rub. |
| Installation of roof aerators, deflectors | m2 | 2500 rub. |
| Device for covering a parapet up to 500 mm wide with dry galvanized steel | m2 | 300 rub. |
| The device of an apron made of galvanized steel at the junction of the roofing carpet to vertical surfaces | m | 30 rub. |
Soft type roofing is widely demanded due to its convenience, practicality, ease of installation and low cost. This coating is sufficiently resistant to aggressive influences. external environment, however, does not have outstanding durability. Therefore, the repair of a soft roof, the technology of which may be different, has to be carried out every few seasons.
How to determine the need for repairs
Waterproofing properties of a soft roof are provided by a layer of bitumen with which it is covered. If over time under the influence external factors there was a violation of its integrity, then this clear sign the need for repair, the technology of which may differ depending on the severity of the damage.
Advice! You should not bring the soft roof to such a state that it will no longer be able to keep moisture from getting inside the room. It is best to carry out a preventive examination at least once every two years.
You need to pay attention to the following signs indicating that the time has come for repair:
- Peeling of the soft roof in places where the panels overlap and join;
- Visible pits and depressions in which water can be retained;
- Moss or fungus in places where water stagnates after precipitation;
- Blisters on the surface, indicating the penetration of moisture under the roofing;
- Noticeable mechanical damage, cracks, rips.
Types of repair work
Depending on the condition of the coating, how worn it is, what damage it has, restoration measures are divided into two types:
- Preventive (current) repair of a soft roof. It is resorted to, according to technology, with minor damage to the canvas that does not provoke a global violation of the tightness of the roof. Characteristic features the need for such repairs - local delaminations, microcracks and small gusts that can be easily eliminated without dismantling the entire soft cover. At the same time, such defects should occupy less than 40 percent of the total roof area;
- Capital repairs of a soft roof. The need for large-scale repairs and the use of more sophisticated technologies is evidenced by the presence of multiple damages in the form of blisters, deep cracks, severe delaminations, leaks, and ruptures. At the same time, they should affect more than 40 percent of the entire soft roof area.
Current repair of a soft roof
If during the inspection no critical damage was found, indicating the impossibility further exploitation old roofing, then work is usually carried out to eliminate existing defects and restore the integrity of the canvas. This so-called Maintenance soft roof, the technology of which allows you to quickly restore all the affected areas of the roof. In this case, as a rule, swollen areas are cut off, water inlets, cornice overhangs are changed, a primer layer is applied and, where necessary, a new roll material is welded.
The repair technology provides for the following work algorithm:
- The roof surface is thoroughly cleaned of accumulated debris, moss and any foreign objects;
- The roof covering is checked for rotten areas. If the latter are found, then they are removed. This also captures a few centimeters of intact coating;
- The swollen areas are cut off with the capture of a small amount of the whole material;
- The places where the roof has been removed are cleaned of dust and dirt, primed and filled with a cement-based mortar;
- After drying, patches are applied to these areas, which are abundantly watered from above with bitumen mastic. In this case, the territory of the entire coverage is certainly captured;
- Finally, a new roofing material is welded on.
Attention! old technology less labor-intensive, however, it has one significant drawback - an increase in the weight of the roof. Therefore, it should be applied only after a miscalculation of all risks and a comprehensive assessment of the strength of floor structures. This technology used primarily to reduce repair costs. By ignoring the operation to remove the old coating, it is possible to reduce the size of the budget by about 30 percent.
Capital repairs of a soft roof
In the event that the old coating is not suitable for further use due to critical damage, it is replaced with a new one. The overhaul of a soft roof, the technology of which is more laborious than the current one, provides for the following work procedure:
- The damaged coating is dismantled. This is a rather laborious procedure that is very difficult to perform manually. It is convenient to use a special machine for this, which cuts the web and immediately twists it into a roll. In the absence of such, the technology makes it easier to work, due to an ax with a long metal ax handle;
- After cleaning the surface from worn roofing material, the state of the base is assessed. If there are cracks, dents, potholes and other defects, partial renovation or complete replacement roofing screed. If there are heat and waterproofing layers, then at this stage the technology also involves their thorough inspection and, if necessary, repair. To increase the service life of the insulation, it is recommended to cover it with plastic wrap or a membrane with a vapor barrier function;
- The surface is primed with bituminous mastic, which protects the vapor and heat-insulating layers, as well as concrete screed from getting wet, and contributing to higher adhesion of the base with the material of the soft roof;
- A new canvas is laid starting from the lower edge of the roof. Installation of cuts of material is carried out alternately, with an overlap on each other by no more than 15 centimeters. In this case, the angle of inclination of the roof should be taken into account: the smaller it is, the greater the overlap should be, since with a more sloping slope, water drains quickly, and with a gentle slope, it lingers, which increases the risk of moisture seeping inside;
- When the laying of all parts of the roofing material is completed, all the seams between them, according to the technology, are well coated with bituminous mastic;
- If necessary, after the bitumen has dried, the technology allows the installation of a second coating layer. It is important to lay the sheets in such a way that the joints are located as far as possible from the joints on the lower web;
- If materials such as roofing felts or roofing felt are involved in the repair, then it is advisable to additionally apply on top of them protective layer using the same bituminous mastic. In conclusion, it should be sprinkled with crushed granite crumbs and compacted with a roller. The materials of the new generation already have shale powder, therefore, in additional protection they don't need. The advantage of using the latter also lies in the fact that there is no need to use mastic for greasing the seams: small overlaps of the cuts are qualitatively and reliably welded onto each other;
- The final stage, carried out after the completion of the repair work, is the identification of places where water accumulates, which will be the most vulnerable in the future. The technology involves such a check after the first rain, although you can pour water on the roof yourself. If such places are identified, they should be thoroughly dried, and then an additional layer of material should be applied to them. If necessary, you can still pour them abundantly with bituminous mastic, which will serve reliable protection leak proof coatings.
There is another soft roof repair technology, which is not so popular today, however, in the old days it was used very actively. Its essence lies in the fact that a new layer is simply deposited on top of the old coating. To do this, all contaminants are carefully removed from the exploited surface, after which it is well warmed up with a heating pad and smeared with bituminous mastic. On the final stage repair, a new layer of roofing material is welded.
So your roll roofing leaking! It is necessary to make repairs.
The concept of roof repair is quite extensible. There are several ways to repair a soft roll roof.
Roughly, soft roof repairs can be divided into 2 types: current roof repairs and major roof repairs. But these 2 types of repair involve several ways. Let's take a closer look at each of them.
Current repair of a soft rolled roof.
The current repair of a soft roof in our understanding is any repair of a roof that is not related to dismantling the old roofing carpet.
Repair of a soft roof with rolled carpets
Polyurethane self-leveling roof
What is a poured roof anyway? It is a synthetic polyurethane liquid rubber, which polymerizes (hardens) from the moisture of the air turning into ordinary rubber. It is applied to the roof with special devices and after that the roof turns into a solid rubber carpet, without seams, in fact, a pool.
Elasticity of roofing whiter than 442%. Those. this coating completely absorbs any movement of the building from temperature changes, precipitation and ground movement during freezing and freezing of groundwater.
Another plus. Polyurethane is a unique synthetic polymer material, it does not rot, does not promote the reproduction of fungi and microorganisms, since it is synthetic, fungi cannot grow on it, trees that destroy the remnants of the screed with their roots cannot grow.
Operating temperature -50 to +120. Very easy to check change operating temperature bituminous rolled carpets and even bituminous mastics - just put a sample in the refrigerator for 5 minutes. Even +5C will drastically change the elasticity of the material, actually reducing it hundreds of times!! Not to mention that bituminous cold mastics imitating a self-leveling roof are diluted with a huge amount of solvent (up to 70%), which leads to an increase in material costs, since, according to the norm, the thickness of the polymer carpet (dry residue) should be at least 1.5 mm, and the solvent will evaporate. Thus, if you use cheap bituminous polymers, you need to apply about 5 kg of polymer to the roof. Which negates all the benefits of their cheap cost. I'm not talking about increasing labor costs, because polymers can be applied in thin layers.
Polyurethane mastic is one-component and has a solvent of 2-5%, after polymerization it has no odors, which is especially important when it is located near the roof of windows, air intake shafts. Polyurethane does not shrink, which once again confirms its quality and distinguishes it from cheap roofing mastics.
Another plus is the polyurethane self-leveling carpet has a weight of 1.5-2 kg per m2 in 3 layers. Which is much less than any roofing roll materials.
- All work is done without fire. There may be exceptions for selective repairs roof bubbles of the old rolled carpet, but these works are few in number.
A separate plus is a huge grip with bituminous coatings and roofing carpets, which allows the application roofing mastic carry out on old rolled carpets without dismantling.
- A huge plus of work with a self-leveling roof is the availability of work in hard-to-reach places, under ventilation and an easy opportunity to qualitatively process all adjunctions. It is in these places that the highest qualification of a roofer with rolled carpets is required, but we have the usual qualification. All the same, it is good when the material is of high quality and it is quite easy to work with it - this significantly reduces the number of failures in work.
Water absorption is much lower than that of roll materials - approximately 1.1% for 24 hours in water.
Separately, I would like to say that only at our enterprise, before going to work, each employee is trained to work on roofing machines, eliminate bubbles, work on sealing adjacencies and applying the coating itself. It is this training that raises the knowledge and responsibility of employees in the performance of work. It is this responsibility, the culture of production, in which the customer's property does not deteriorate, the adjacent territory does not get dirty, most customers note in their gratitude for the work of our company.
The need for roof insulation
If the roof is pitched, especially if for a long time leaks of this flat roof, huge icicles may occur during even sub-zero temperatures. This suggests that the mineral wool (insulation) is completely out of order and the dew point is above the insulation and even the roofing carpet. In this case warm air from interior spaces rises to the roof and melts the snow, freezing a little later, ice edges form, which do not allow water to leave the roof in time, which leads to additional filling of all internal layers with water and additional destruction of the insulation under the screed.
If there is a formation of large icicles, you can not avoid the insulation of the roof. You can insulate the roof with both extruded polystyrene (a dense synthetic material that does not rot and is very durable), and mineral wool, which has a fire certificate. Warming can occur with the dismantling of the screed, and over the screed. It should be borne in mind that, according to modern standards, the screed should fully contribute to the free outflow of water, therefore it is laid with a slope of 3 cm per m / n (1.5% -3% according to SNiP standards). However, if the roof is made of roll materials with top layer from materials with coarse-grained dressing, the slope can be increased up to 10-25%. SNiP II-26-76
At its thinnest point, it should be at least 3 cm. If the roof has a width of 15m and the funnel is in the middle, then for every 7 meters there is a slope of 21cm, i.e., the average thickness of the roof will be 12cm. i.e. the weight of the screed will be approximately 8m2 = 1m3. Weight of 1 m3 of concrete = 2.2 tons. Those. an area of 1000m2 can reach 275 tons. And this consumption will approach the GOST standards. And now we do not take into account the weight of the insulation, ceilings and roofing carpet. But because of big expense materials (weight), on our roofs very often and they make a marriage with a small slope, which leads to a serious difficulty in draining water. I would also like to note that it is precisely because of this weight that it is advisable to use light filler and foam concrete, as well as to raise the slope with the help of a heater. So it will be possible to significantly reduce the weight of concrete on the screed.
I met designers who thoughtlessly allowed to make a screed over the old one, but after my insistence on doing the calculations (which is above), they also demanded the dismantling of the old screed. However, what if the building is not under construction, but is already in operation? We recommend using extruded (synthetic insulation) and laying a durable membrane on top. According to GOST and SNiP standards ( building codes and rules) mineral insulation serves effectively only 10 years under a screed, and even this I don’t think for long, so I recommend synthetic insulation - extruded foam styrene (foam or teplex (produced Nizhny Novgorod)). The service life of this insulation is virtually unlimited, since it does not rot and does not fill with water (does not absorb). Even less efficient operation mineral heaters- if the insulation is placed on top of the screed.
CONCLUSION:
As you noticed, replacing the insulation is a serious test for the entire building, so you need to extend its life by repairing the roofs and not allowing chronic leaks to reduce the life of the insulation. I'm not saying that the formation of large icicles can also lead to criminal cases, as they regularly fall and injure passers-by.
The strength and durability of your building directly depends on the condition of the roof and load-bearing structures. Always carry out these works with a margin of safety and durability, do not wait until the last minute, this will significantly save both money and time, and there will be no damaged property.
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