Water intake funnel on a flat roof. Drain funnel for a flat roof. Mounting. Repair funnels

25.11.2019

Water intake funnels "Polyvent" are fixed on the roof between two layers roofing material, and in the case of a single-layer coating, an additional layer measuring 700mm by 700mm.

1. the bottom layer of the roofing carpet is laid.

2. In the bottom layer of the roofing carpet, in the place where the funnel is to be installed, a hole is cut with a diameter equal to the diameter of the upper part of the funnel flange.

3. the place where the funnel collar will be installed is burned with a burner flame to remove the film covering the roofing material
(in case it exists), then it is poured with hot bituminous binder (hot mastic).

4. On the bottom layer of the roofing carpet, poured with hot bituminous binder, a water intake funnel is installed.

5. the top layer of the roofing material is welded (or laid in another prescribed manner). A short exposure to the flame of a propane torch on the top of the funnel collar is allowed.

6. in the top layer of the roofing material in the place where the funnel is installed, a hole is cut out equal to the diameter of the inlet of the funnel flange.

	is a roof drain with leaf filter made of polypropylene. Designed to remove rainwater from flat roofs. It is not subject to corrosion, has good mechanical properties and can be used in all climatic zones of the Russian Federation. It is recommended to install one such funnel for every 300-400 m² of roof, but at least one per roof.
Specifications
Leg height, mm	245
Weight, kg	0,51
Collar size, mm	380
D input, mm	110

Funnel “REPAIR POLYVENT”	Funnel “REPAIR POLYVENT”- Made of polyethylene, which gives them the ability to tightly fit any surface. Are applied at repair of drainage systems of a roof. The funnel leg is inserted into the old roof funnel, or into sewer pipe diameter 100 110 mm. A special insert inside the funnel greatly increases the rate of water intake. The funnels are equipped with a leaf filter.
Specifications
Leg height, mm	240
Weight, kg	0,57
Collar size, mm	297
D input, mm	87

	- inserted into old funnels, including cast iron ones, with a diameter of 60 to 200 mm to prevent leaves and other debris from getting into them. Thanks to the use of a leaf filter, the internal drainage system does not require constant maintenance. The insert, which is inserted into the funnel, significantly increases the volume of water received.
Specifications
Protective grille diameter, mm	160/180
Weight, kg	0,14

The main function of drainage systems is to protect the roof and facades from the effects of precipitation, as well as to prevent the destruction of the foundation. The gutter effectively collects and removes water from the roof surface of the house. It is no secret that it is thanks to the use of gutter systems that the operational life of the facade and roof increases many times, appearance remains unchanged.

As you know, the reliability of the roof, first of all, determines its slope, that is, the angle that the slope forms with the horizon. Usually it is measured in this case as a percentage. Obviously, if the slope is 0% or so, water should accumulate, and from a roof that has a large slope, water will roll off. Thus, in the first case, leaks and the need for major repairs are inevitable.

Attention!

Water, stagnating on the roof, although slowly, but necessarily destroys the roofing material. Quickly wash off the surface of the topping material, deprives it of its resistance to ultraviolet radiation .

In the stagnant zone, water, penetrating into defects, also exacerbates existing problems.

drains

Even when draining, water can linger at the lowest point of the roof, so it is necessary.

They are usually divided into:

The place of installation of drain funnels must be chosen, based only on the degree of efficiency of water intake. For example, if you install them near the supporting columns, due to deformation of the base of the roof, these points, instead of the lowest ones, may well become the highest, especially when there is no required slope grounds.

A huge amount of water accumulates on the roof during heavy rains. There are cases when, due to excessive load on the supporting structures, the roof collapsed. Therefore, the roof is provided additional drain- stormwater. By the way, it also helps out when the main drain becomes clogged.

When the water level exceeds a certain maximum (it is primarily determined based on permissible load on the roof), the storm drain begins to discharge water. Usually, we are talking about 5-7 cm.

Gutter funnel - installation rules

The roof funnel is the element responsible for collecting water. The hull has a wide side. She herself is equipped with an apron or a crimping metal flange, as well as a protective grill, a barrier to clogging the intake opening.

Gutters are located in the lowest places of the roof, evenly distributed over the surface.
According to technology minimum slope between the base for the installation of the roofing carpet and the water intake funnel is 2%, respectively, also in the valley.
The minimum is increased to 5% at about half a meter from the funnel (reduce thermal insulation or level the screed). All this should be taken into account in the thermal calculation.
Regardless of the type of insulation, it is recommended to use two-piece funnels. Since the heaters themselves are subject to some movement, the funnel must have some compensation dynamic margin.

The lower part of the roof funnel is installed in the passage hole on the roof slab. The upper part, passing through the roofing carpet and insulation, enters the lower one. From below it is inserted into a standard downpipe.
An O-ring seal is installed between both parts of the funnel. The funnel at the top is equipped with a small plastic apron. It should be located on the bottom lining layer of the roofing material. Then an additional lining layer, and a bituminous apron is welded on top of it. roofing cake is completed with a top layer of bituminous roofing material, which is laid on top of the resulting bituminous apron. Lastly, install the protective grille.

Roof funnels are one of the main components of high-quality drainage from roofs. Climate change is forcing people to protect their buildings from adverse precipitation in every possible way. Therefore, it is very important that the storm drain works efficiently and without failures, because the facade and foundation of the house are at stake. big problem have industrial and government buildings with a flat roof, because water has a destructive effect on the roof carpet.

Absolutely flat roofs does not happen, so its reliability depends on the bias. A slight slope is required for effective drainage. A good indicator would be a slope of 2-5 percent. In this situation, water will easily escape from the surface of the roofs, which will give more freedom for the functioning of the roofing carpet. If there are small defects, then they will not bring much damage.

Recently, the inclination is not enough, so when building a building, they pay attention storm systems drainage, which provide protection and reliability, and preference is given to the use of water intake funnels.

The concept and principle of operation of a storm funnel

The main component of a drain is called a storm funnel. She's working on collection and diversion Wastewater from the roofs. With its help, rain and sedimentary liquid is transported first to pipes that are located inside or outside the building, and then to the sewer or to specially designated places.

Also roof funnels are the most important structures building coverings. As a central point of liquid collection, they require the correct installation of even a small wire on flat surfaces. The slightest miscalculation in system design can lead to malfunctions and loss of money.

To avoid leaks and ensure the desired rate of collection of liquid, it is necessary to control the tightness of all contacts on the wire connections. To increase the density, it can be equipped with a clamping flange, an auxiliary drain ring and an increase in the body. Funnels are mounted at all stages of construction and connected with cast-iron, steel or plastic pipes.

What parts does a funnel consist of?

The storm drain funnel consists of the following components:

Housing, including 1 or 2 flanges and a drain neck;
Clamping flange that presses the roofing sheet;
Screws and nuts that give force to the clamp;
Clamping screws that are in smooth cylindrical holes;
Wires and cables.

Rain funnel design (horizontal and vertical outlet)

Standard scheme:

Extended structure - top part;
Extension cable - middle part;
Body, for embedding heating - the lower part.

Based on the area where they are applied, they can be:

With horizontal outlet;
With vertical outlet;

Difference: the location of the outlet (holes for draining water).

With a swivel joint, the angle during rotation can range from 0 to 90 degrees.

When are horizontal and vertical exhaust systems used?

With a horizontal outlet, they can be used for non-attic roofs. The funnel clings tightly to the waterproofing, which is responsible for the heating process. Here it smoothly passes to the sewer risers, going down. It should be noted that this installation is less profitable, since if you need to change the part, you will need to open a large section of the roof. Plus, when installing a horizontal funnel, it is necessary to carry out calculations on the heating freezing limit. If a miscalculation occurs, the system will freeze and stop functioning.

Storm drain types and where they are used

To date, market shelves know more than 40 types of storm drains, which are made from a wide variety of materials and can be used for a wide variety of types of buildings. According to the type of building can be: with and without heating system, with horizontal and vertical outlet, with and without filters. But we have already talked about these types a little higher.

Therefore, we will consider their division by purpose:

For roofing materials (bituminous and membrane);
For roofs in traditional and inversion style;
For roofs that are in operation and not;
For balconies and terraces.

Attention! Usually architects show the points of minimum reduction of the surface. Choosing the right funnel is the main task facing sewer designers.

For right choice The designer must have the following information:

What is the section of the roof, its layers and dimensions;
The material and diameter of the equipment that is used for the storm pipe;
Information about: whether heating is needed;
Complete information about the funnel.

Advice! If you have any questions, ask for help from specialists who will help you get information on the cut of the roof.

Types of existing roofs:

Inverted or inverted roofing. It is characterized by laying the waterproofing cable on the base, and the remaining layers - under it. As a result, the system works all year round at a temperature of 18-20 degrees Celsius. It is protected from ultraviolet radiation and has practically no damage, which is displayed in the non-repair period, increasing it by 5-6 times. Permeated with many wires connected in a cable, the heating system guarantees a stable temperature.
Lightweight roofs. For their mounting, special funnels with a box are used, which are attached with a wire to the base.
Exploited roofs used with models of funnels with a flat lid, and not exploited - a device with a ladder and a special grate;
Roofs with and without heating system. If green, it is a crimp flange mechanism with a mesh that traps the grass. Freezing is possible for systems, therefore, the following requirements are set for funnels: strength, lightness, corrosion resistance, long service life, ability to work at temperatures from -50 to +80 ° С.

Attention! An important characteristic for funnels is the service life. On average, manufacturers give a 50-year warranty. During this period, the cable can be damaged, the system completely fails only if it is intentionally damaged.

Mounting. Repair funnels

The territory for placing the funnel must be chosen based on the basics of building design, it is also worth considering the features of sewage and storm water. The number of installed funnels depends on the design of the roof, the amount of precipitation. Basically, they should be at a distance of 25 m and on the sector - every 200-300 sq.m. We select the type according to the indicators of the waterproofing cable.

So, the slope of the roof must be at least 3%. To bypass the blockage of the main funnel, we install at least two such systems. We bring all the components to the sewers and set up an emergency system in case of overload.

The system can be completed with:

Crimp flange, which is connected by wire to the cable;
Drainage rings and nozzles;
heating system;
Locking valves;
Wires and cable;
ladders.

A special variety is, warming the soul, is the view - repair. Its purpose is to reduce the cost of repairing the device. If there is a breakdown of the storm drain, then it is enough to replace the heating waterproofing. Reconstruction is easy and effortless. This system does not require heating. Repair devices have receiving indicators in their structure, and they can easily mount a stormwater mechanism.

Findings: knowledge of the features of stormwater when installing them on various roofs(exploited, flat, heating and not heating, etc.) will help you choose correct device, which will give you the opportunity not to interfere in the work of the storm drain for many, many decades.

Funnel drain for flat roof(fitting) is the main element of the external drainage system. Through it, rain or melt water enters pipes that can be installed outside or inside the house, and then into the ground, catchment tank or sewer. For free drainage of water, the water intake is mounted at the lowest point of the roof. In this case, the minimum slope in its direction is 2 °.

Drainage funnel device

Today on the market you can find different kinds gutter fittings, which differ from each other in the material of manufacture, design, build quality and cost. The standard design of the water intake consists of the following elements:

housing - made of galvanized steel, cast iron or plastic (mounted directly into the roof);
grate - is a filter element that protects the drain system from contamination;
downpipe - used to connect the fitting to the downpipe;
sealing rings and gaskets - allow you to achieve maximum tightness of the junction of the product with the roofing material, thereby preventing moisture from entering under the roof;
thermal cable - considered additional element, which increases the efficiency of draining in the cold season, preventing water from freezing near the outlet.

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Types of water intake fittings

Roof funnels are classified according to the following parameters:

Manufacturing material. Modern water intakes are made from cast iron, galvanized steel, plastic, or a combination of several materials. When choosing a funnel on this basis, it is necessary to take into account what the roof itself is made of. So, for sheet flooring, the best option is a metal fitting, for concrete floors - cast iron, and for soft roof- plastic.
The form. Funnels can be flat or cap-shaped. The first view is set flush with the roof plane. Such products periodically need to be cleaned of leaves, branches and other debris, so they can only be mounted on operated roofs. Cap-shaped products are equipped with a protective mesh that protects the water intake from contamination.
Design. Fittings for flat roofs can be made in the form of a one-piece structure or consist of two parts connected by a flexible pipe. The second type is used on movable roofs (non-ventilated or wooden). Due to the fact that the constituent parts of the funnel can be displaced relative to each other, with any movement of the base, the integrity and tightness of the product is maintained.
throughput. Depends on the diameter of the outlet. When choosing capacity, you need to take into account the area of the roof and the annual rainfall observed in your area.
Method of fastening to the base. A drain funnel for a flat roof can be fastened with a crimp seam or a flexible apron made of roofing felt or thick film. Seam fastening is universal because it can be used with any roofing material.

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Funnel mounting procedure

The first step is to choose the installation location of the fittings. These products are mounted at the lowest points of the roof. At the same time, they should be evenly distributed over the entire surface of the floor, which will achieve high efficiency of the drain system.

After choosing a place for the fitting, the lower part of the product is installed in the hole prepared in the ceiling. The fixation of the funnel to the base should not be rigid in order to exclude the possibility of damage during temperature deformations. Next is the laying of insulation and waterproofing. Then the top of the funnel is attached to the bottom. To improve tightness, an O-ring is additionally mounted. The film apron of the fitting is placed between the lower and upper layers of the roofing material and fixed with molten bitumen mastic.

To prevent the occurrence of stagnant puddles, it is necessary to organize a slope towards the drain holes of at least 2 °.

This can be done using a screed or laying a heat-insulating layer of different thicknesses. It should be noted that the drain is not recommended to be placed near the supporting columns, since deformation shifts are often observed in these places, which can adversely affect the service life drainage system. Funnels for flat roofs are installed at the rate of 1 pc. per 150 m 2 of overlap, however, their number must be at least two. For example, for a roof with an area of 70 m 2, 2 fittings are required, for 100 m 2 also 2 pieces. If the roof area is more than 300 m 2, then for the normal operation of the drain, 3 water intake points should be used.

On the last step works fit finishing layer roofing material, which is inserted into the fitting bowl and secured with a clamping ring. After installing the protective cap, the performance of the entire structure is checked. To do this, a bucket of water is poured near the water intake and it is observed whether all the liquid enters the drainage system.

In addition to the fact that rain and melt water gets into storm sewer from the surface of the earth, they are also diverted from the roof of the house. These drains are called internal.

In the house, an internal drain drains rain or melt water from the roof through pipelines located inside the building. From these pipes, water enters external network storm sewer (closed outlet) or on the pavement (open outlet).

Installation of drain funnels

The drain is usually arranged from pressure asbestos-cement, steel or plastic pipes. In the presence of vibration loads, steel pipes must be used.

Gutter funnels can be of several types (example in Fig. 117). The gutter funnel consists of a body installed in the ceiling, a frame, a grate (cap) for holding large debris. The funnel is hermetically connected to the roof so that moisture cannot seep in and harm the ceiling. A layer of waterproofing material is fixed with bolts between the body and the frame and sealed with mastic. To date, you can find drain funnels of the following diameters: 80, 100, 150 and 200 mm.

Rice. 117. Drain funnels:

a - flat funnels with gratings; b, c - bell funnels; 1 - lattice; 2 - frame; 3 - body; 4 - jet straightener; 5 - cap

Drainage funnels with gratings are usually installed on flat roofs, funnels with caps, as a rule, on pitched and flat roofs. Since funnels cylindrical shapes with a strong flow of water, turbulences are formed by the very same, reducing their throughput. Therefore, in order to increase their throughput, special jet straighteners are used, which do not allow turbulence to form at the edge of the drain funnel and prevent narrowing of the flow area.

Atmospheric and melt moisture enters a closed drainage network through a storm water inlet (an example in Fig. 118), which is a well, barred. Storm water inlets can be round or rectangular shape. The bottom of such a well should have a smooth outline, without a pit for precipitation.

The drainage ditch must be connected to a closed network through a well with a settling part.

As a rule, storm water inlets are arranged at intersections from the side of surface water inflow, on a long section of descent or ascent, in low places with a sawtooth profile of the street tray.

Rice. 118. Reinforced concrete storm water inlet:

1 - sidewalk; 2 - lattice; 3 - connecting pipeline