Soft roof at what temperature can you work. Is it possible to lay a soft roof in winter

Can the roof be covered in winter?

Roofing is one of the last stages of any construction. But what if it coincided with late autumn? More recently, each construction site was “frozen” for the winter period, but thanks to the release of new materials, it became possible to carry out roofing work in absolutely any climatic conditions.
Soft roofing is the material that allows installation even in severe frost. And you won't have to leave your house without a roof for the winter. The main thing in this work is to observe a number of features.

Roof installation in winter and its main points

Two days before the start of work, all roofing elements are placed in a warm room with a temperature of at least +20 degrees.

Tiles of flexible tiles are delivered to the place of installation gradually as needed.

The base on which the installation is made must be clean, dry and free of ice.

If the work is planned to be carried out in severe frost down to -20 degrees, then a “green house” is necessarily built. It is a kind of tent, which is built from boards or film over the area where the work will be carried out. The height of the structure should be such that it is convenient for people to move around in it. Often, in order to increase the temperature, tents are supplemented with heat guns.

As you know, bituminous shingles are easily glued to the roof sheathing and create an airtight connection under the influence of sunlight. But in winter there is little sun, so professionals advise using a hot air gun.

How to choose the right soft roof for winter installation?

Ideally, the roof should have the lowest possible flex temperature on the beam, and a minimum dimension to the radius of the beam itself. The recommended temperature range is from -55 0 to +110 0 . Such characteristics ensure that flexible tiles do not crack during winter installation. This is also important in the future, namely when servicing the roof in winter. The coating is more durable and will not suffer after removing snow or ice.

If, after reading this article, the question of whether it is possible to cover the roof in winter is still not entirely clear to you, call or request a call back. Our specialist will answer all your questions.

The term "soft roof" means with a direct or inverse arrangement of layers of bituminous - polymeric mastics and materials based on fiberglass, fiberglass and polyester fabric.

In this article, we will consider the device in the winter, and is it possible to do a soft roof in winter?

We will also touch upon the issues of operating a soft roof in winter and removing snow from the coating.

To begin with, consider the existing types of soft roofing.

In official documents, another term is used to refer to a soft roof - roll roofing.

The design and repair of a soft roof is established by the Code of Practice SP 17.13330.2011 SNiP II-26-76"Roofs".

The document refers to rolled roofs as straight and inverted roofs, with an insulation layer made of bitumen, bitumen-polymer material, various membranes and mastics.

With a carpet made of rolled material with gravel or coarse-grained dressing, it varies from 1.5 to 10%, from bituminous - polymeric material with coarse-grained dressing - from 1.5 to 25%.

To create a slope on a horizontal base, a cellular concrete screed of monolithic laying is used. The screed can be laid on the base or on the insulation. It is possible to use special shaped extensions from slab insulation.

Soft roofs with a slope ≥ 25% are performed subject to the use of hot mastic and roll material with a heat resistance of 90 ° C, or cold mastic with a heat resistance of 100 ° C.

The composition of the soft roof with a direct arrangement of layers looks like this:

• Base;
• Sloping layer;
• Vapor barrier;
• insulation;
• insulation from 2 - 4 layers of bituminous roofing material, the top layer has a fine or coarse-grained dressing.

The number of insulating layers is taken taking into account the technical characteristics of the material and the slope of the roof

In an inverted roof, the layers are arranged in reverse order:

• Base;
• Sloping screed;
• Waterproof carpet;
• insulation;
• filter material;
• Weight from gravel or concrete tiles.

Inversion roofing is performed on large areas and on exploited roofs.

Materials for soft roofing

A large number of roofing materials are produced in Russia. For repairs or new installations
roofs in winter materials with flexibility on a beam with a diameter of 15 cm are suitable at a temperature of -25 ° C of the trademarks Technoelast, Uniflex, Linocrom, Bipolikrin, Bikrost, Krovlyaelast and others.

Common is bituminous - polymer resin applied to the base of fiberglass, fiberglass or polyester.

Materials intended for welding have a special film on the bottom that melts when heated - it serves as an adhesive. Roofing materials without a film are glued on bitumen-polymer mastics. Materials for the lower layers of the carpet are produced without mineral dressing, materials for the upper layer have coarse or fine-grained dressing.

Major repairs and minor repairs - what's the difference?

The difference between a major overhaul and a minor roof repair is significant. To assess the condition of the roofing pie in several places, pits measuring 1x1 m are selected, the number of layers of the carpet is determined from the exposed areas, type and condition of the insulation, the presence of a vapor barrier.

Major overhaul includes replacement, assessment of the condition of the insulation: if it is not in working condition, the replacement of the insulation is also required. In the case of a working state of the heater, measures are taken to drain it.

NOTE!

In case of minor repairs on defective sections of the roof, the carpet is replaced or laid additional layers waterproofing material. When repairing or laying by a contractor, each layer of roofing materials requires drawing up acts of hidden works.

Previously used slab insulation made of foam concrete, polystyrene is not able to meet the requirements of the current standards for resistance to heat transfer of enclosing structures and they are completely changed. In addition, the current standards have tightened the requirements for vapor barrier insulation: previously, isolation from moisture vapor from residential and office premises was not required. Respectively, to install the vapor barrier, it is necessary to dismantle the insulation.

Definitely require replacement of waterproofing and vapor barrier layers of roofing material, roofing felt, glassine, the service life of which is not more than 5 years.

Common defects

Defects most often occur due to a violation of technology work, non-compliance with design decisions, inaccuracy of staff and lack of care by the owner of the house.

Regular inspection of the roof, timely detection of blisters, vegetation, cracking and delamination of the material can prevent leakage and wetting of the insulation.

Several methods have been developed to detect leaks.

The most effective - filling the roof with water and draining the water after determining the places of defects is possible on flat roofs and the presence of special equipment.

• Leaks occur after rainfall or within 1-2 days later. Flickering leaks that appear periodically are possible.
• Leaks of the first type indicate mechanical damage to the coating, improper installation or poor-quality carpet material.
• Leaks of the second type appear due to poor-quality sealing of junctions and in case of improper installation of the fence and drainage system.
• flickering leaks they talk about microcracks in the roofing material, the insufficient size of aprons at the junctions.

And now let's talk about whether it is possible to lay soft tiles in winter?

Installation of a soft roof in winter

Is it possible to lay a soft roof in winter? Winter is not the best time to do roofing. However, if necessary and following the rules, you can lay a soft roof in winter:

• Laying in winter should be done under a special awning;
• Work with water-based solutions at a temperature not lower than +5° С;
• Thoroughly dry the base before applying mastics and primers;
• Soft roof hardens in winter and becomes brittle, so it should be thoroughly heated;
• Warm up the carpet material at room temperature before laying within 1-2 days.

CAREFULLY!

The use of gas burners for work on the roof is allowed with non-combustible insulation(stone and basalt wool, fiberglass). When using heaters of the G4 combustibility group (expanded polystyrene), fuse with a building hair dryer!

The quality of roofing work in winter depends on compliance with the rules for working with materials. Soft roof device at negative temperatures:

1. The base must be level and dry;
2. The screed for the slope must mature;
3. It is not allowed to contact the porous insulation with wet materials and screeds;
4. Before fusing the waterproofing layer, the surfaces (insulation, plastered parapets, ventilation shafts) must be primed with a primer;
5. Connection points must be protected with aprons.

Flat roof installation

Laying a soft roof in winter requires more technological operations: heating the carpet material at room temperature, drying the base, heating the material before laying with a gas burner or hair dryer. As a result - additional waste of resources and money, low productivity. If the requirements of the material manufacturer's technological maps are observed, laying soft tiles in winter is possible, but not economically feasible.

Temperature conditions and roofing work

In regulatory documents no direct ban winter repairs on the roof.

The main requirement for the outdoor temperature is recorded in SNiP 3.04.01 - 87 "Insulation and finishing work": roofing work can be carried out in the temperature range from -30 to +60 ° C.

Works with combustible mastics are allowed to be carried out up to -20 ° C.

Works with water compositions without antifreeze additives - not lower than + 5 ° С.

The possibility of performing work to a large extent depends on the technical characteristics of the material. If the passport indicates flexibility on a bar with a diameter of 15 cm at a temperature of -25 ° C, then at -30 it will break.

So, the repair of a soft roof in winter at sub-zero temperatures in detail.

We do winter roof repairs

Urgent repair of the coating in winter can be performed two ways:

1. put in place of the defect patch from roofing material;
2. Seal the leak with mastic based on polyurethane.

In the first case, the work is carried out as follows:

1. We clean the place of leakage from snow and ice;
2. We dry the place of leakage with a gas burner or a building hair dryer;
3. The amount of roofing material required for sealing, preheated to room temperature, is evenly heated with a hairdryer or burner from the bottom side until the pattern changes;
4. We apply the patch to the place of the leak, align from the center to the edges, eliminating swelling;
5. Glue by tapping with your hands or with a special roller.

The order of work when using mastic:

1. We clean the place of leakage;
2. We dry;
3. We prime;
4. We put a layer of geotextile on the repaired area, fix it with a stapler to the base;
5. Pour a layer of polyurethane mastic;
6. After polymerization of the first layer (7-8 hours), we perform the second layer of mastic.

Preparation for repair

The first way is faster and easier, the second way is more reliable.

After repairing a flat roof in winter, it is advisable to leave it has a layer of snow 5 cm for protection from solar radiation and bad weather.

Roof care

It is easier, faster and cheaper to fix a problem noticed in time, a minor defect. In order not to bring the roof of the house up to, during the calendar year, it is necessary to inspect the health of the coating.

Is it necessary to clean the soft roof from snow? Yes, definitely!

In winter, it is necessary to clean the soft roof from snow: with a flat roof, heavy snowfall can exceed the permissible load on the roof slabs - and this is a disaster! With a pitched roof, excess snow will come down with an avalanche during a thaw. Snow removal from soft roofs is a mandatory roof maintenance procedure.

Is it possible to walk on a soft roof in winter? Strongly do not recommend do this, as the coating becomes very fragile in winter and there is a high probability of damage to the coating.

This simple inspection will allow you to notice problems in time and make minor repairs.

1. Ceilings of the upper floor - to detect stains;
2. Roofs - to detect blisters;
3. Roof junctions to parapets and elevations;
4. Fastening aprons and tight seals.

At sub-zero temperatures, pay attention to:

• Icicle formation;
• Ice plugs in funnels;
• Icing of wall sections near drainage systems;
• The amount of snow on a soft roof.

Walking on a soft roof in winter is strongly discouraged!

In autumn, clean the roof and gutter system from fallen leaves. The topic of repair work on the roof is extensive, as is the number of roofing materials and technologies. If it is not possible to carry out repairs on your own, it is always possible to turn to professionals. The roof of your house requires respect - the durability of the building as a whole depends on its condition.

Useful video

And now we invite you to watch a video on repairing soft tiles in winter:

In contact with

Roofing work is carried out at an outdoor temperature of up to -20°C, and in the conditions of the Far North, as an exception, up to -30°C.

For the conditions of the Far North at temperatures below -20 ° C, it is recommended to use rolled polymer materials in the form of prefabricated carpets () or perform roll-free roofs from cold polymer mastics on solvents (Krovlelit, Venta-U).

Restrictions in the production of roofing work at negative temperatures are mainly that it is not allowed to perform roofing work in icy conditions, snowfall, fog, strong winds.

At negative outside temperatures, rolled materials can be glued to the following bases: on asphalt concrete - immediately after asphalt concrete has been laid; for any prepared in the warm season; on a prefabricated board from slabs with a factory-made single-layer rolled carpet (the seams between the slabs are sealed with a cement-sand mortar with the addition of potash - 10% by weight of cement); on cement-sand with expanded clay filler with a fraction of up to 3 mm (cement:sand ratio - 1:2 wt. h.) and the addition of potash to the solution (10 ... 15% by weight of cement).

Roof structures for construction in the conditions of the Far North have distinctive features at the junctions, on the eaves and overhangs (Fig. 49) and at the points where water intake funnels pass (Fig. 50).

It is not allowed to apply a primer and stick roll materials if the base of the roof is powdered with snow, covered with frost or ice. Ice in the form of a crust of frost or ice is sprinkled with industrial table salt (at the rate of 150 g / m 2), then after 6 ... 7 hours the base treated with salt is sprinkled with sawdust, and after 2 ... with portable heaters. The suitability of the base is checked by a test sticker of the rolled sheet.

Rolled materials are kept in a warm room and delivered to workplaces in insulated containers. Containers are metal boxes with lids (section 350X700 mm, height 1050 mm), insulated from the inside with foam. Mastic is served on the roof in thermoses, asphalt - in insulated containers.

For heating workers, as well as for intermediate storage of materials, temporary insulated rooms should be equipped on the roofs.

The carpet glued in winter is inspected in the warm season, if necessary, repaired, and then the remaining layers are glued according to the project.

In winter conditions, rolled carpets, except for the top layer, are glued, as a rule, on cold mastics. The top layer is glued in the warm season after a preliminary examination. When applying mastics through the pipeline (Fig. 51), it must be insulated. Mastics are heated in thermos boilers. The maximum temperature of the mastics is 180°C.

When applying, the temperature of the hot mastic should be 160°C, and cold 70°C.

In winter conditions, roll materials are recommended to be glued only along the slope, regardless of the roof slope. When sticking rolled panels manually, the mastic should be applied in strips to the width of the brush perpendicular to the direction of rolling the roll and immediately roll and grind the panels.

Simultaneous laying of multi-layer rolled carpets in winter, regardless of the type of mastic, is prohibited.

Additional layers of carpet at low temperatures are glued to funnels, junctions, valleys and cornice overhangs only on hot mastics, regardless of the material used for the installation of the roofing carpet.

The rolled carpet at the junctions of the water intake funnel must have an additional lower layer of fiberglass impregnated with isol mastic.

The distance from the funnels of the internal drains to the walls, ventilation shafts and exits to the roof should be sufficient for the installation of a rolled carpet adjoining, but not less than 1 m.

Cold gluing mastics in the winter season must be heated to a temperature of 70°C. Mastic in cans is heated in a container with water, heating it from the outside. Continuous heating of water does not allow mastic to cool down.

Thermal insulation device

The heat-insulating layer is best made from prefabricated insulation boards. To avoid the installation of leveling screeds, the slabs are sorted in a warm room by size, paying special attention to their thickness. The slabs are laid, pouring under them, if necessary, a leveling layer of expanded clay. The joints are sealed with mastic from a mixture of liquefied bitumen with a fibrous filler (asbestos of the 6th and 7th groups). Sealing the joints with mastic allows you to get a more durable roof base.

If the project provides for gluing heat-insulating plates to the base, then a primer is applied to the surface of the reinforced concrete slabs (or other supporting base), and after it dries, mastic is applied.

Monolithic thermal insulation in winter, as a rule, is not satisfactory, since when laying concrete mixtures with light aggregates, it is necessary to apply electrical heating, which is quite difficult in roof conditions and takes a lot of time, and anti-frost additives can worsen the thermal insulation properties of heaters. Of the compositions for the device of monolithic thermal insulation, bitumen-perlite is the most preferable. It is prepared from hot bitumen and filler - perlite, fed and applied in a mechanized way: hot bitumen through heat-resistant sleeves using bitumen pumps, perlite - through a pipeline using compressed air.

Screed device

Screeds at negative temperatures are arranged from prefabricated asbestos-cement and cement slabs and monolithic - cement-sand and asphalt concrete. Since it is very difficult to carry out wet processes in winter at low temperatures, the construction of a solid prefabricated base in winter is preferable both in terms of labor costs and the quality of work. Prefabricated slabs are glued on hot bituminous mastics.

Cement-sand screeds arrange from cement-sand mortars with a composition of 1:2 or 1:3 (wt. h.) With the introduction of antifreeze additives - potash (calcium chloride) or sodium carbonate salts. The amount of additives for the main composition is determined in the laboratory. In cement-sand mortars, river or mountain sand is replaced with expanded clay.

Cement-sand mortar with antifreeze additives is laid heated to 40 ... 60 ° C, excluding the transfer of mortar from one container to another as much as possible. Solutions are delivered to the construction site in closed tanks (mortar carriers). When transporting through pipelines, receiving and distributing hoppers are closed with tight lids to ensure tightness. Bunkers and pipelines are covered with thermal insulation.

When supplied to the roof by cranes, the solution is delivered in insulated containers, which are loaded (from mortar trucks and other vehicles) in insulated rooms. The solution supplied to the roof in a container, without reloading into other containers, is placed on a motor scooter or motorized cart and transported to the installation site. The roofers lay the delivered mortar in strips along the lighthouse rails through one, leveling and compacting with vibrating rails, priming the mortar immediately after it is laid and covering the finished strip with a continuous insulating layer of mats. After laying the solution through the strip, the beacon rails are removed and the intermediate strips are filled with the solution, also leveling their surface, priming and covering with an insulating layer.

Asphalt screeds have the advantage over cement-sand screeds in that, due to their high temperature at the time of laying (170°C), they are easier to level. The asphalt concrete mixture is delivered to the roof and to the workplace of roofers in insulated containers; at very low temperatures, the containers with the mixture before laying are heated with the help of thermal electric heaters (TEN) to the operating temperature. The mixture is laid in areas of 4X4 ​​m along the verified beacon rails and immediately leveled and compacted with rollers weighing 90 kg.

Screeds from an asphalt concrete mixture and a cement-sand mortar are arranged in the winter in cases where the installation of the supporting base of the roofs ends in winter and it is impossible to reschedule their installation. In this case, instead of monolithic screeds, flat asbestos-cement slabs are sometimes also used. When installing prefabricated screeds, their base (the surface of the heat-insulating layer) is carefully leveled. Prefabricated elements are glued on hot bituminous mastics. The seams between the prefabricated slabs are filled with a mixture of liquefied bitumen grade BN-70/30 with a filler of asbestos of the 7th group.

Screeds, arranged before the onset of cold weather, when the roofs are made on them in winter conditions, are immediately primed (before the mortar starts to set).

Roll carpet gluing

For gluing rolled materials, cold bituminous mastics on thinners (varnish kukersol or solar oil) are mainly used.

When constructing roofs from welded roll materials, installations with burners operating on liquid or gas fuel (propane butane) are used to heat the cover layer.

Rolled materials, including the built-up roofing felt, are kept rolled out in a warm room at a temperature of 20 ... 25 ° C for 24 ... 48 hours before gluing, rolled up and placed in 5 ... 7 rolls in a container with thermal insulation. These containers are transported to the roof by light cranes and scooters, delivering directly to the laying area.

All containers with hot mastic are equipped with electric heaters to ensure the desired temperature (160 ... 180 ° C).

Given the difficulty of gluing roofing roll materials on hot mastics, it is advisable to arrange a roofing carpet using cold bitumen-cookersalt or bitumen-latex-cookersalt mastics (). These mastics are prepared centrally with the introduction of a larger amount of diluent and heated before application to 70...80°C.

When gluing on cold bituminous mastics, mark the line for laying out rolled materials aged in a warm room and try them on the laying area. A roll of cloth is rolled out on a primed base, applying cold mastic to the base and roll material using spray rods. The roofer, pressing the glued panel to the base, makes sure that there is no mastic roller in front of the roll, which indicates the need to reduce its consumption. The panels are glued alternately at first with a transverse overlap, i.e. in width, the next row with a longitudinal overlap.

|| Thermal insulation materials. Purpose and classification || Materials for leveling screeds and protective layer of roofs || Paints and putties. Drying oils || Mineral binders. Purpose and classification || Building solutions. Types and classification of solutions || General information about roofs, roofing and the organization of roofing work. Roof classification || Preparation of the bases under a roof. Substrate surface preparation || The device of roofs from rolled materials. Preparation of roofing materials || Installation of mastic roofs. Roofs from bituminous, bituminous and polymeric and polymeric mastics || The device of roofs on panels of coverings of the increased factory readiness. Complete panels || The device of roofs from piece materials. Roofs from small-piece materials || Roofs from a metal tile. General information || Sheet metal roofing. Preparatory work || Roof repair. Roofs from rolled materials || Safety

General requirements. Roofing work is carried out at an outdoor temperature of up to -20°C, and in the conditions of the Far North, as an exception, up to -30°C. For the conditions of the Far North at temperatures below -20°C, it is recommended to use rolled polymer materials in the form of prefabricated carpets or to perform non-rolled roofs from cold polymeric mastics Krovlelit, Venta-V on solvents. Restrictions in the production of roofing work at negative temperatures are mainly that it is not allowed to perform roofing work in icy conditions, snowfall, fog, strong winds.

At a negative outside temperature, rolled materials can be glued on the following bases: asphalt concrete - immediately after laying asphalt concrete, any prepared at a positive temperature; prefabricated from slabs with a factory single-layer rolled carpet (the seams between the slabs are sealed with a cement-sand mortar with the addition of potash - 10% by weight of cement); cement-sand with expanded clay filler with a fraction of up to 3 mm (cement:sand ratio - 1:2 wt. h.) with the addition of potash to the solution (10 ... 15% by weight of cement). Roof structures for construction in the conditions of the Far North have features at the junctions, on eaves, overhangs (Fig. 87, a) and in places where water intake funnels pass (Fig. 87, b). Recommended: lay the first layer of roofing material on the eaves 3 dry with a topping - down; arrange heat-insulating liners 4; overlap the eaves with additional layers of roofing carpet 5.

Rice. 87.
1 - klyyammer; 2 - aprons; 3 - a layer of roofing material (dry), laid with a topping down; 4 - liners; 5 - additional layers of roofing carpet; 6 - main roofing carpet; 7 - cover panel; 8 - water intake funnel; 9 - cement-sand mortar; 10 - galvanized steel pallet

The main roofing carpet 6 (Fig. 87, a) is made stepped and not brought to the eaves by 350 mm, the main thermal insulation is laid along the vapor barrier on the covering panels 7. The entire cornice section is protected by an apron 2 made of galvanized roofing steel, fixed with clamps 1. At the junctions to the funnels on the coating panel (Fig. 87, b), layers of an additional roofing carpet 5 are laid, which are brought close to the water intake funnel 8, as well as the main carpet 6. The heat-insulating layer is laid on a galvanized steel pallet 10. The funnel is fixed with bolts embedded in cement-sand mortar 9. It is not allowed to apply a primer and stick roll materials if the base of the roof is covered with snow, frost or ice. Ice in the form of a crust of hoarfrost or ice is sprinkled with commercial table salt (at the rate of 150 g/m2), then after 6...7 hours the base treated with salt is sprinkled with sawdust, and after 2...3 hours the sawdust is swept away and the moistened base is dried with portable heaters. The suitability of the base is checked by a test sticker of the rolled sheet.

Rolled materials are kept in a warm room and delivered to workplaces in insulated containers. Containers are metal boxes with lids (section 350x700 mm, height 1050 mm), insulated from the inside with foam. Mastic is served on the roof in thermoses, asphalt - in insulated containers. For heating workers, as well as for intermediate storage of materials, temporary insulated rooms should be equipped on the roofs. The carpet glued in winter is inspected in the warm season, if necessary, repaired, and then the remaining layers are glued according to the project.

In winter conditions, rolled carpets, except for the top layer, are glued, as a rule, on cold mastics. The top layer is glued in the warm season after a preliminary examination. When mastics are supplied by pump 7 (Fig. 88) through pipeline 1, it must be insulated. Mastics are heated in thermos boilers. The maximum temperature of the mastics is 180°C. When applying, the temperature of the hot mastic should be 160°C, and cold 70°C.

Rice. 88. :
1 - pipeline; 2 - clamp; 3 - weather vane; 4 - inner pipe; 5 - frame; 6 - pipe for supplying mastic from a thermos; 7 - pump

In winter conditions, roll materials are recommended to be glued only along the slope, regardless of the roof slope. When sticking rolled panels manually, the mastic should be applied in strips to the width of the brush perpendicular to the direction of rolling the roll and immediately roll and grind the panels. Simultaneous laying of multi-layer rolled carpets in winter, regardless of the type of mastic, is prohibited. Additional layers of carpet at low temperatures are glued to funnels, junctions, valleys and cornice overhangs only on hot mastics, regardless of the material used for the installation of the roofing carpet. The rolled carpet at the junction of the drain funnel must have an additional lower layer of fiberglass impregnated with isol mastic. The distance from the funnels of the internal drains to the walls, ventilation shafts and roof outlets should be sufficient for connecting the rolled carpet, but not less than 1 m. equipment (Fig. 89).

Rice. 89. :
a - insulated bunker for asphalt concrete; b - insulated box for two rolls of roofing material; c - insulated wheelbarrow for asphalt concrete; g - a roof for a wheelbarrow and a bunker; 1 - frame made of bars 30x40 mm; 2 - slag; 3 - plywood

Thermal insulation device. The heat-insulating layer is best made from prefabricated insulation boards. To avoid the installation of leveling screeds, the slabs are sorted in a warm room by size, paying special attention to their thickness. The slabs are laid, pouring under them, if necessary, a leveling layer of expanded clay. The joints are sealed with mastic from a mixture of liquefied bitumen with a fibrous filler (asbestos of the 6th and 7th groups). Sealing the joints with mastic allows you to get a more durable roof base. If the project provides for gluing heat-insulating plates to the base, then a primer is applied to the surface of the reinforced concrete slabs (or other supporting base), and after it dries, mastic is applied. Monolithic thermal insulation in winter, as a rule, is not satisfied, since when laying concrete mixtures with light aggregates, it is necessary to use electric heating, which is quite difficult in roof conditions and takes a lot of time, and antifreeze additives can worsen the thermal insulation properties of heaters. Of the compositions for the device of monolithic thermal insulation, bitumen-perlite is the most preferable. It is prepared from hot bitumen and filler - perlite, fed and applied in a mechanized way: hot bitumen through heat-resistant sleeves using bitumen pumps, perlite - through a pipeline using compressed air.

Screed device. Screeds at negative temperatures are arranged from prefabricated asbestos-cement and cement slabs and monolithic - cement-sand and asphalt concrete. Since it is very difficult to carry out wet processes in winter at low temperatures, the construction of a solid prefabricated base in winter is preferable both in terms of labor costs and the quality of work. Prefabricated slabs are glued on hot bituminous mastics. Cement-sand screeds are made from cement-sand mortars with a composition of 1:2 or 1:3 (wt. h.) With antifreeze additives - potash (calcium chloride) or sodium carbonate salts. The amount of additives for the main composition is determined in the laboratory. In cement-sand mortars, river or mountain sand is replaced with expanded clay. Cement-sand mortar with antifreeze additives is laid heated to 40 ... 60 ° C, excluding the transfer of mortar from one container to another as much as possible. Solutions are delivered to the construction site in closed tanks (mortar carriers). When transporting through pipelines, receiving and distributing hoppers are closed with tight sealed lids. Bunkers and pipelines are covered with thermal insulation. When supplied to the roof by cranes, the solution is delivered in insulated containers, which are loaded (from mortar trucks and other vehicles) in insulated rooms. The solution supplied to the roof in a container, without reloading into other containers, is placed on a motor scooter or motorized cart and transported to the installation site. The roofers lay the delivered mortar in strips along the lighthouse rails through one, leveling and compacting with vibrating rails, priming the mortar immediately after it is laid and covering the finished strip with a continuous insulating layer of mats. After laying the solution through the strip, the beacon rails are removed and the intermediate strips are filled with the solution, also leveling their surface, priming and covering with an insulating layer.

Asphalt screeds have an advantage over cement-sand screeds in that, due to their high temperature at the time of laying (170°C), they are easier to level. The asphalt concrete mixture is delivered to the roof and to the workplace of roofers in insulated containers; at very low temperatures, the containers with the mixture before laying are heated with the help of thermal electric heaters (heaters) to the operating temperature. The mixture is laid in sections of 4x4m along the verified beacon rails and immediately leveled and compacted with rollers. Screeds from an asphalt concrete mixture and a cement-sand mortar are arranged in the winter in cases where the installation of the supporting base of the roofs ends in winter and it is impossible to reschedule their installation. In this case, instead of monolithic screeds, flat asbestos-cement sheets are also sometimes used. When installing prefabricated screeds, their base (the surface of the heat-insulating layer) is carefully leveled. Prefabricated elements are primed on both sides, then glued to 100 mm wide spacers, which are glued on bituminous mastics. The seams between the prefabricated slabs are filled with a mixture of liquefied bitumen grade BN-70/30 with a filler of asbestos of the 7th group. Screeds, arranged before the onset of cold weather, when the roofs are made on them at a negative temperature, are immediately primed (before the mortar starts to set).

Roll carpet gluing. For gluing rolled materials, cold bituminous mastics on thinners (varnish kukersol or solar oil) are mainly used. When constructing roofs from welded rolled materials, installations with burners operating on liquid or gas fuel (propane-butane) are used to heat the cover layer. Rolled materials, including welded ones, are kept rolled out in a warm room at a temperature of 20...25°C for 24...48 hours before sticking, rolled up and placed in 5...7 rolls in a container with thermal insulation. These containers are transported to the roof by light cranes and scooters, delivering directly to the laying area. All containers with hot mastic are equipped with electric heaters to ensure the desired temperature (160 ... 180 ° C).

Taking into account the complexity of gluing roofing roll materials on hot mastics, it is advisable to arrange a roofing carpet using cold bitumen-polymer mastics. These mastics are prepared with the introduction of polymers and heated before application to 70...80°C. When gluing on cold bituminous mastics, mark the line of laying out rolled materials, aged in a warm, cleaned room, and try on the laying area. A roll of cloth is rolled out on a primed base, applying cold mastic to the base and roll material using spray rods. The roofer, pressing the glued panel to the base, makes sure that there is no mastic roller in front of the roll, which indicates the need to reduce its consumption. The panels are glued alternately at first with a transverse overlap (in width), the next row with a longitudinal overlap (in length).

We are glad to welcome you on 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 gasket and built-up vapor barrier.
	Each type of these plates has its own advantages and disadvantages. Call us and we will offer you the brand of insulation that is right for you.
	We will perform work on creating 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 basis of the rolls. Only fiberglass and polyester. The traditional technology for the repair of soft flat roofs includes the fusing of 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. As a roofing we use high-quality materials of the TechnoNikol company.
	Polymer-bitumen grades with a thickness of more than 6 mm (with two-layer laying) The service life of the roll coating is from 15 years. Strict adherence to the technology of work.
	Domestic and imported polymeric membranes. All accessories for installation are available. Three automatic welding machines. Crews with 10 years of experience in PVC membrane roofing.
	Operational visit to the object. Reliable troubleshooting. The roofers of Stroy-Alliance are certified by TechnoNikol.
	We will draw up a commercial offer according to the technical task or defective statement within 1 working day. If necessary, we will calculate the cost at state rates.

In our activities we use only proven technologies and 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 object, directly from the manufacturing plants, bypassing intermediaries.
We offer potential Customers various methods of work performance. This also applies to the optimization of grades of materials, and technologies used in the installation of roof 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 with high quality, without violations of technology and in a short time?
Call now or leave a request and our roofers will get down to business!

Benefits of cooperation with Stroy-Alliance

Stroy-Alliance 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, studied in Russian and foreign companies. All this guarantees that our specialists will prevent errors, take into account every nuance in the work and provide a high-quality product as a result. Stroy-Alliance specialists clearly fulfill their obligations under the contract, so our company is considered a reliable partner. Expensive modern equipment that we use for installation, repair of flat, soft, built-up, bituminous roofing, laying of rolled roofing, roof waterproofing is the advantage of Stroy-Alliance, as this allows us to minimize the time of work without loss of quality.

• More than ten years is our experience with PVC membranes. We provide our services at a wide variety of facilities: shopping malls, warehouse terminals, private homes;
• Installation of membrane roofing is carried out in the shortest possible time (from 500 square meters per day);
• Quick budgeting, preparation of a full package of documents when putting the object into use (acts of acceptance of work performed, acts of hidden work, etc.);
• Installation of a rolled roof made of PVC membranes, repairs, installation of a built-up flat roof are carried out by us throughout the Central Federal District of Russia;
• The work of Stroy-Alliance fully complies with tax legislation (when concluding a work contract, VAT is deducted);
• 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;
• Brands of materials used are agreed with the Customer;
• When providing services, we use the latest foreign equipment;
• Citizens of the Russian Federation work in the brigade.

Leave your roof repair worries on the shoulders of our specialists!