Repair of a flat roof with roll materials sequence of works. Flat roof. How to repair a flat roof covered with other roll materials

We are glad to welcome you to the site of the roofing company "Stroy-Alliance"
The main and priority activity of our organization is the high-quality performance of work on the installation and repair of flat roofs. We will reliably carry out the following works:

	Laying of padded and welded vapor barrier.
	Each type of these plates has its own advantages and disadvantages. Call us and we will offer the brand of insulation that will suit your specific case.
	We will perform work on the creation of slopes from expanded clay or using wedge-shaped thermal insulation.
	Installation of cement-sand and prefabricated screeds.
	Reliable brands of roofing waterproofing. No fiberglass as the base of the rolls. Fiberglass and polyester only. The traditional technology for repairing soft flat roofs includes fusing roofing roll materials using gas burners. This method of installing and repairing flat roofs is intuitive and has been used for over 30 years. The practical experience of performing such work by the specialists of our organization is 17 years. We use high-quality materials from the TechnoNikol company as a roof covering.
	Polymer-bitumen grades with a thickness of more than 6 mm (with two-layer installation) The service life of a roll coating is from 15 years. Strict adherence to the technology of work.
	Domestic and imported polymer membranes. All accessories for installation are available. Three automatic welding machines. Teams with 10 years of experience in PVC membrane roofing.
	Prompt departure to the object. Reliable elimination of defects. Roofers of the Stroy-Alliance company are certified by TechnoNikol.
	We will draw up a commercial proposal according to the terms of reference or a defective statement within 1 working day. If necessary, we will calculate the cost according to state rates.

In our activities we use only proven technologies and we use materials that have passed many years of testing in real operating conditions. In principle, we do not work with materials that have low technical performance and a short service life. We supply the main materials to the site directly from the manufacturing plants, bypassing intermediaries.
We offer potential Customers various methods of work execution. This also applies to the optimization of grades of materials and technologies used in the installation of roofing structures. We know how to save money without losing quality!

Do you want the repair or installation of a flat roll roof to be carried out efficiently, without violations of technology and in a short time?
Call right now or leave a request and our roofers will get down to business!

Advantages of cooperation with the company "Stroy-Alliance"

The Stroy-Alliance company is proud of its team. Due to the fact that we do not have a “staff turnover”, over the years of our existence, the company's employees have gained invaluable experience, trained in Russian and foreign companies. All this guarantees that our specialists will prevent mistakes, take into account every nuance in their work and provide a high-quality product as a result. Stroy-Alliance specialists strictly fulfill their obligations stipulated by the contract, therefore our company is considered a reliable partner. Expensive modern equipment that we use for installation, repair of flat, soft, welded, bituminous roofs, roll roofing, roof waterproofing is the advantage of Stroy-Alliance, as it allows you to minimize the terms of work without losing quality.

More than a dozen years have been our experience in working with PVC membranes. We provide our services at a wide variety of facilities: shopping malls, warehouse terminals, private houses;
We install membrane roofing in the shortest possible time (from 500 square meters per day);
Quick budgeting, preparation of a full package of documents for the commissioning of an object for use (acts of acceptance of work performed, acts of hidden work, etc.);
Installation of roll roofing made of PVC membranes, repairs, installation of a welded flat roof are carried out by us throughout the Central Federal District of Russia;
The work of the Stroy-Alliance company fully complies with the tax legislation (VAT is deducted at the conclusion of a work contract);
Installation, repair of a flat roof is carried out using a variety of methods (modern and traditional);
Departure of a technical specialist is carried out with maximum efficiency and completely free of charge;
The brands of the materials used are agreed with the Customer;
When providing services, we use the latest foreign equipment;
The brigade employs citizens of the Russian Federation.

Shift your worries about roof repair on the shoulders of our specialists!

Any coverings and roofing including - are not eternal. Even the most modern of them are subject to wear and tear and a gradual loss of their protective qualities. Under the influence of precipitation, temperature changes, mechanical factors, the roof material collapses, cracks, bubbles, delamination, faults, etc. appear on it. And then leaks are just a stone's throw away! Flat roofs are particularly prone to this type of damage due to their geometry and use as coverings for soft materials.

Moreover, the first minor defects may appear literally after a couple of years of operation. Should we re-cover the roof? Not at all. You can eliminate damage by performing timely repair of a flat roof. Simple measures to restore the roofing will help to extend its service life, and, importantly, will not require large expenditures.

cracking of the surface;
local mechanical damage (holes, through cracks, cuts);
peeling of the roofing at the edges and in the seams;
the appearance of folds;
decay of the coating;
bloating, blisters;
wear (loss) of the top layer of the roofing carpet.

The causes of defects are various factors: errors during installation, insufficient insulation of attic floors, mechanical influences, environmental influences.

In any case, damage to the integrity of the roof will sooner or later lead to leaks, destruction of concrete floors. This has caused the need to carry out current local repair of a flat roof at a time when its complete replacement is not yet needed.

Repair of rolled bituminous roofs

Most often, flat roofs are covered with roofing felt or its analogs from a series of fused bituminous waterproofers (euroruberoid, rubemast, glass insulating material, etc.). So let's start with them.

Local damage (cuts, breakouts, penetrations)

Mechanical damage on the surface of the roof can occur as a result of its clearing of snow in winter, hail ingress, and human movement. Other possible reasons: deformation of the base and initial defects allowed during the installation of the coating.

Local defects are eliminated by installing a patch on the damaged area. The patch is cut from the same material as the base cover. Its edges are rounded to reduce the likelihood of delamination, and the size is made so as to cover the defect by 10-15 cm in all directions.

Traditional repair work algorithm:

the place of damage is cleaned (including from protective dusting) and dried;
cut out the patch;
stick it on mastic or fuse it with a construction hair dryer;
smooth the patch with a roller or other suitable object to align the edges of the patch with the base surface.

If everything is done correctly, the integrity of the roof will be completely restored, and the patch will be almost invisible.

The process of installing a patch over a crack in a bituminous coating was filmed:

Extensive damage to bituminous roofing

It occurs most often if moisture seeps under the bituminous layer, a large area of the roof is damaged and begins to rot. To restore the integrity of the coating, perform the following actions:

the damaged area is cleaned of gravel (in the presence of dressing);
cut out a square or rectangular piece of fabric containing damage (layer by layer);
cleanse and dry the resulting gap;
using the cut out piece of canvas as a template, cut out as many patches from the bituminous material as it was decided to replace the layers;
smear mastic on the exposed area and glue the patch back to back, smooth it with a roller;
similarly, the next layers of patches are glued;
cut out another finishing patch, so that it overlaps the damaged area by 10-15 cm on all sides;
smear with mastic and glue a patch on it, smooth it with a roller.

When using the deposited material, the repair is carried out in the same way, with the exception of using bitumen mastics for gluing patches. The patch cut from the waterproofing is heated from below with a hot air gun until the adhesive bitumen layer melts. Then the patch is laid in place, fixed and smoothed with a roller.

Cracking of the bituminous surface

Bituminous materials are susceptible to the formation of small surface cracks caused by exposure to the sun and high temperatures.

To seal surface cracks, do the following:

the damaged area is cleaned of dirt, old mastic and dusting (if any);
dry;
cover with mastic in 2 layers;
the renewed area is covered with coarse-grained dressing.

It is also allowed to apply a patch of the same material as the base coat to the area with a network of cracks. Moreover, its size should overlap the area of the defect by 10-15 cm from all sides. The patch is glued on top of the mastic; when choosing a fusion method, the lower side of the patch is preheated with a hot air gun stream.

Air or water bubbles

Formed as a result of seasonal or daily temperature fluctuations in the summer, when the roof quickly cools and heats up. The air in the insulating layers of the roofing carpet expands and "inflates" bubbles. The same happens if moisture has seeped into the under-roof space. When heated, it evaporates, forming swellings.

Repairs to eliminate bubbles:

remove layers of dusting from the place of swelling;
the place of the swelling is cut with a knife along or with an envelope (criss-cross), the edges are folded back to dry parts;
dry the inner surface;
cleanse it of dirt;
the cavity is treated with bituminous mastic;
glue the folded edges back onto the mastic, press down and roll the restored fabric with a roller;
a pre-prepared patch is glued with mastic or fused onto the cut site with its overlap by at least 10-15 cm, pressed with a roller.

More details:

Peeling the waterproofing carpet from the backing

It occurs if, during the installation of the roll cloth, the base (concrete slab or screed) was not sufficiently cleaned of dust and dirt. Or the installation was carried out without priming the base with a bituminous primer. All this leads to a low degree of adhesion between the waterproofing material and the substrate.

To eliminate the described trouble:

the exfoliated part of the canvas from below is cleaned of mastic;
remove dirt from the base, dry it;
apply mastic to the base and stick the exfoliated area on it;
press the restored site with a roller;
if the web of material in the place of delamination was torn, then a patch with a width of 20 cm or more is applied along the gap line.

Repair of membrane roofs

Polymer membranes are more durable than any bituminous waterproofing. Their service life reaches 50 years. But even membrane roofs are not insured against various types of mechanical damage, including punctures, ruptures, and depressurization of the seams. Most often, coverings are damaged when performing various works on the roof, for example, when clearing snow or installing equipment.

Restoration of a damaged membrane usually involves sealing the defects with polymer patches, and if the seams diverge, they are re-sealed.

Mechanical damage

Tears and cracks on the surface of the polymer web can occur as a consequence of careless movement on the roof, cleaning from snow and ice using sharp tools, falling objects or dragging them.

The sequence of restoration work:

the repaired section of the web is cleaned and degreased;
cut out a patch from the membrane, preferably of the same type and manufacturer as the base coat; its dimensions should be such as to cover the defect by 5-10 cm on each side;
the patch is soldered with a stream of hot air using a welding machine;
roll the sealed place with a roller.

The whole technology looks like this:

When installing a patch on an EPDM membrane, you can use the adhesive fastening method, without using welding.

Depressurization of seams

The separation of adjacent blades at the seam joints occurs when the blowing force and welding temperature are incorrectly selected during installation, the speed of the welding machine. Another possible reason is the installation of the membrane with an initial "interference", with the help of which inept installers visually compensate for unevenness in the base.

Depressurization is eliminated as follows:

the place of delamination is treated with a special cleaner;
seams are soldered with a welding machine;
in some cases, to strengthen the places of delamination, a patch of membrane is applied over the problem seam.

There is another way to get rid of damage without using welding machines and expensive components. These are modern Eternabond technologies used to restore tightness of seams and minor damage.

Eternabond repair material is a roll tape with an adhesive layer on one side. The tape is capable of forming a homogeneous surface with the membrane, which is not inferior in strength to a solid sheet.

Repair work using EternaBond tape is carried out as follows:

the surface of the defect is treated with a special solvent;
cut off the necessary part from the tape roll;
remove the protective film from the adhesive side of the tape;
press the tape to the place of the defect and roll it with a roller.

More details:

Repair of mastic roofs

Flat roofs are not always covered with roll materials or polymer sheets; quite often in recent years, liquid waterproofing has been used for these purposes. A special mastic is applied to the base of the roof, which, under the influence of air, hardens and takes the form of a polymer membrane.

After several years of operation, cracks may appear on the mastic roof. They should be cleaned of dust and dirt, and then filled flush with mastic or polymer-cement mortar. An additional continuous layer of mastic is placed if the area of damage is more than 40%. In this case, first, the damaged areas are restored locally with mastic, and then another layer of mastic with a thickness of at least 3-4 mm is applied over the entire surface, and after it has hardened, a protective layer is applied.

Features of overhaul

All measures for the partial restoration of the roof belong to the current (planned) repair, during which only minor damage can be eliminated. If the service life of the coating comes to an end, and defects make up more than 50% of its area, a flat roof is overhauled.

It consists in replacing the entire roofing covering, and, if necessary, all components of the roofing pie (thermal insulation, vapor barrier).

The complex of works carried out during the overhaul of the roof:

the old coating is dismantled;
if the base was a cement-sand screed, then, in most cases, it is also removed - with the help of seam cutters, bumpers;
all layers that make up the roofing cake are inspected (insulation, waterproofing membranes, vapor barrier films);
upon detection of damage, the problem layer is replaced;
a new cement-sand screed is poured (if it was originally provided);
a new roof covering is being laid.

In addition, overhaul may include the replacement or installation of roofing aerators, the installation of drainage funnels, the arrangement of abutments and eaves.

When performing a major overhaul of the roof, there is a possibility of its complete reconstruction. For example, by including a layer of insulation in the structure, an ordinary roof can be converted into an insulated one. Or, by adding a top durable layer, make an exploitable roof from an unexploited roof.

During the reconstruction, some materials can be replaced with others more suitable for specific operating conditions. A common situation: replacing a bituminous coating with a polymer membrane. In this case, it is not necessary to dismantle the old material. PVC membranes are mounted on a bituminous roof through geotextiles, which act as a separating layer. If TPO or EPDM membranes are used, then they are laid without geotextiles, directly on the bitumen coating.

Overhaul is an expensive undertaking, in most cases complicated by the dismantling of the old coating. Therefore, you should not bring the roof to a deplorable state before the end of its service life. And for this, it is necessary to periodically carry out preventive inspections of the roof and, if defects are found, to carry out timely maintenance.

A flat roof is the most common roof arrangement. However, her service life is limited. The Atelier Roof company provides a wide range of roof carpet maintenance services, including maintenance and overhaul of flat roofs in Moscow and Moscow region at a bargain price.

Repair types

In the case of a local nature of the work, a partial replacement of the defective coating is carried out, as well as the elimination of delamination and swelling.
During the overhaul of a flat roof, it is planned to completely replace the insulation layer and carpet material, including preparing the surface for the subsequent installation of a new coating. Overhaul can be caused by damage to more than 40% of the total area of the roof covering. Due to the high labor and material costs, this type of work is much more expensive than the current one.

What determines the cost

Repair begins with the departure of a specialist to inspect the current state of the flat roof and assess the necessary labor and material costs. After that, the terms and the estimated cost of materials and other consumable products are agreed with the customer.

The final price for the repair of a flat roof is formed from the following cost items:

costs for the purchase of basic and rough materials;
fare;
time spent by the masters.

The final estimate is drawn up only after a thorough examination of the flat roof, the choice of an effective technical solution to the customer's problem and taking into account all third-party factors.

How we are working

Leave a request on the website or by phone

At a certain time you will meet our specialist

We agree on technical details

We conclude a contract with a guarantee

We carry out installation work on time!

Ready! You accept and pay for the work

When is repair needed?

Flat roofing problems usually arise from water stagnation on the surface, wetting of the thermal insulation layer or evaporation of moisture from the roofing carpet. For the reasons described, the following damage to the coating may occur:

swelling of the surface;
layering of the roofing cake;
formation of depressions and funnels with rainwater;
blistering or cracking;
germination of various vegetation through the inner layers;
destruction of the coating around the chimneys.

Periodic preventive inspection will help you limit yourself exclusively to current local repairs. Otherwise, after a while, it will be necessary not only to completely replace the coating, but also to spend money on the restoration of the premises. It is recommended to carry out work only on warm days and in dry weather.

Our services

In order for the repair of a flat roof to be of proper quality, our specialists carry out all the work according to a specific plan:

a specialist visits the object;
the coating is inspected, all the necessary measurements are taken and the required calculations are performed;
if necessary, the old coating is dismantled;
a project of the future roof is being prepared;
installation of the base and roofing material is carried out;
final work on the installation of the drainage system is being carried out.

Repair of a flat roof today is becoming more and more popular, since such a roof structure is very widespread not only in multi-storey, but also in individual construction. Its benefits are quite obvious. A flat roof with a small angle of inclination allows not only to save heat energy, reducing the heat transfer area. It allows you to use it for domestic and economic purposes, thereby increasing the usable area of the entire structure.

Before proceeding with the repair of a flat roof, it is necessary to study all the rules and requirements, since mistakes can lead to a reduction in its service life.

However, this use also has a negative side. It greatly increases the risk of damage to the roofing, primarily by mechanical means. Meanwhile, a flat roof, despite its external simplicity, is a rather complex structural system.

That is why the repair of a flat roof should be carried out with the strict observance of a number of rules and recommendations. Their violation can lead to a radical reduction in the service life of the roofing, up to its complete destruction.

Flat roofing and possible types of damage

Before proceeding with the repair of a flat roof, you need to know its structure. Then the weakest points of this particular structure will be clear, and it will be easier to identify the cause of the roof leak. Usually its construction consists of several layers. This is a load-bearing surface, in the role of which is a reinforced concrete floor slab, on which a vapor barrier layer is placed, and on it, in turn, a heater.

As the latter, mineral wool is most often used. A layer of waterproofing is laid on it, in the role of which, in most cases, rolls of roofing material act.

If the roof surface is occupied for household or domestic needs, a concrete screed is made on top of the waterproofing layer, designed to protect it from mechanical damage. In addition, to prevent moisture condensation from the insulation layer, ventilation holes are brought out, covered with special caps. Their connections to the top layer of waterproofing must be sealed carefully.

The main reason for the penetration of moisture under the waterproofing layer, in addition to mechanical damage, is the effect of temperature drops in the surrounding atmosphere. The second most common cause of roof leakage can be considered a violation of technology during the initial installation of the roof covering.

It is worth remembering that the service life of a roof covered with roll materials such as roofing felt is limited to a maximum of 5 years.

In winter, under the influence of severe frosts, it begins to lose elasticity and crack. In summer, due to its black color, it attracts solar thermal energy and heats up to 70 ° C.

As a result, the resin impregnating it begins to melt, and gradually slides down a slope towards the edge of the roof.

The base remaining in place largely loses its waterproofing properties and begins to gradually let moisture through.

Modern waterproofing mastics and resins have a significantly longer service life, but they are also much more expensive.

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Roof repair with roll materials

Rolled bitumen materials are the most common and popular roofing product, primarily due to their affordable price. Another reason for their popularity can rightfully be considered that their use does not require dismantling the old coating. However, do not immediately lay new rolls on top of the old coating. It must be prepared in advance.

First of all, it is necessary to remove the debris and dust accumulated on the roof. After that, the formed air bubbles are detected on the roof. They are opened with a knife, like an envelope, and dried if necessary. After that, they are heated with a blowtorch until the bitumen impregnation has melted and closed, eliminating air bubbles.

Only then can the next layer of rolled roofing material be laid. The roll is rolled out on the roof surface, one edge is heated and glued at the lower edge of the roof.

After that, it is folded back, winding on a piece of pipe slightly longer than the width of the roll.

Then they begin to slowly unfold it, heating the surface with a blowtorch. An indicator of the quality of heating is a small puddle of molten bitumen on the way of unrolling the roll.

The next roll in the longitudinal plane must be laid on the previous one with an overlap of at least 10 cm.

The adjacent roll should go to the edge of the previous one by at least 5 cm. As a result, if the technology is followed correctly, after the molten bitumen cools down, a monolithic waterproof membrane is formed that covers the entire roof surface.

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Application for the repair of polymer materials

Most modern waterproofing materials are made on the basis of polymers. If it is a mastic, then its main component is liquid polyurethane. Its first layer is applied directly to the prepared surface using a paint roller. It adheres tightly to the bituminous base. Then, a reinforcing layer of non-woven synthetic fabric with a density of 20 to 60 grams per m² is placed on the not yet hardened mastic so that it is completely recessed. After that, a second layer of polyurethane mastic is applied on top. The process of its solidification lasts from 3 to 5 hours.

Another effective modern waterproofing material is liquid rubber. It is applied by spraying using special portable knapsack spray guns. The main advantage of this method is that it is not afraid of any irregularities on the surface of the roof. To obtain a rubber coating with a thickness of 3 mm, it is necessary to spray from 4 to 4.5 kg per 1 m². The resulting membrane is resistant to temperature extremes, but in severe frost it loses its elasticity, which makes it more susceptible to mechanical damage.

Another tool that is gaining more and more popularity these days is polymer tension membranes. They are assembled using hot air welding machines, and are only attached to the edges of the roof. Therefore, if the foundation of the house begins to sag, the coating will retain its integrity. However, as in the case of previous materials, membranes are also vulnerable to mechanical damage, therefore, if the surface is intensively used, a protective coating must be put on top of the waterproofing.

The simplest protective coating, especially for roll-to-roll coatings, is a concrete screed. Unfortunately, over time, it begins to crack and crumble. Quite good reviews are received about the high-strength polyurethane coating "Marisil 400", but many are discouraged by its high price

In general, it can be noted that the repair of a flat roof, unlike its other varieties, is practically not associated with a risk to life and health, and therefore it can well be done by hand, without the help of hired specialists.