Roofing funnels for flat roofs

For flat roofs to remain functional and intact, roofing funnels are essential. These modest but crucial parts, which are made to effectively control water runoff, aid in preventing water pooling, which over time may result in leaks and structural damage.

Flat roofs need thoughtful drainage systems, in contrast to pitched roofs, which naturally direct water towards gutters. Water enters through roofing funnels, which direct it away from the roof’s surface and toward downspouts. By doing this, water is kept from building up and creating possible risks like mold development or roofing material deterioration.

The design and slope of the roof must be carefully taken into account when installing roofing funnels. Effective drainage is ensured by proper placement, even in the event of severe rain or snowfall. Through quick drainage of water from the roof’s surface, these funnels contribute to a longer roof lifespan and lower maintenance costs over time.

In order to keep a dry and sturdy roof structure, flat roof owners and builders must comprehend the function of roofing funnels. By keeping these parts regularly inspected and maintained, you can avoid common problems brought on by inadequate drainage, guaranteeing top performance and defense against water-related damage.

"Roofing funnels are essential for effectively controlling water runoff on flat roofs and averting possible structural problems. These small but essential parts improve drainage and add to the durability and performance of flat roof systems. Examining their layout, advantages, and design can help professionals and homeowners alike make well-informed decisions that will guarantee the best longevity and performance from flat roof installations."

Distribution funnels of flat roofs: installation and heating

These days, flat-roofed structures—typical of multi-story and industrial buildings—are becoming more and more common in private housing developments. Extra space can be obtained for setting up a terrace, sports field, pool, or garden with this kind of roof. To safeguard the roofing from moisture-induced damage, it’s critical to implement a reliable system for draining melt and precipitation, as well as to ensure that water intake funnels are installed and heated appropriately.

The choice of the drainage system

There are two drainage system options available for flat roofs:

1. Traditional (requires the installation of a large number of funnels, water through the pipes of the system goes by gravity).
2. Gravitational-vacuum (is characterized by high throughput with a minimum number of communications).

Conventional internal drain. The funnels must be installed at the lower points, and a roof ramp must be completed correctly for it to work effectively. The size of the roof determines how many water receivers are needed. The vertical drain pipe, through which water from the roof enters the sewer, is connected to the wooding elements via pipes. Installing sloped horizontal pipeline components is crucial for allowing water to freely drain naturally through gravity.

Vacuum-gravitational system. Because of its great efficiency and effectiveness, it has been actively used for more than 30 years in many European and international countries. The system’s ability to create a vacuum medium allows water to be drawn from the surface and flow through pipes at a high speed, which is the basis of the operating principle. Among the system’s benefits are:

• The flow has high speed;
• Simplified installation (less funnels and communications are required, pipes can not be mounted under the slope, since the water moves through them under air pressure);
• low weight (does not create additional exposure to the roofing system);
• efficiency (more than a smaller diameter are used in comparison with a traditional system without loss of performance);
• the ability to self -clean (the throughput of the system does not change from the course of time).

In contrast, a vacuum system’s funnel can miss up to 15 liters of liquid with a horizontal release of 75 mm in a second. It will be necessary to install a funnel with a 200 mm horizontal release in order to guarantee the same throughput as the traditional drain.

On a flat roof, heavy rains can cause an accumulation of water that the discharge system is unable to handle. In order to prevent structural collapse caused by an excessive load, a storm drain must be equipped. When the last drain becomes clogged, he can also take on the role of the main drain.

The choice of a spillway funnel

Veros for internal drainage arrangements are composed of metal, polymers, or a mix of materials. It is crucial to take into account the kind of material that will be used as the roof’s flooring when selecting a product. Installation of metal funnels on sheet metal-covered roofs is done. Installing polymer products on a soft roof is appropriate.

A flat roof funnel may release in a vertical or horizontal direction and take on a round or rectangular form. The installation location and roof characteristics determine the selection. Although products vary in design, it is still possible to firmly fasten the funnel to the roof’s base and guarantee the mounting unit’s trustworthy waterproofing.

Funnels with a metal flange are clamped in place using stainless steel fixing components. Adhesive is used to attach funnels with a polymer flank that have a sealing cuff.

Clogging of the drainage system needs to be prevented. Funnels come with protective lids or nets to keep large debris out of the drain. Products for operated roofs have flat lids with slots in them. Caps can support the weight of an individual. It is best to use funnels with a mesh cap acting as a leaf filter if the goal is to create a "green" roof.

The principle of placement of water receivers

Water receivers need to be mounted in the roof’s lowest points. It needs to be applied to the surface in an even layer. The surface slope towards the drainage funnel should be at least 2% to prevent the formation of stagnant puddles on the roof. At a distance of approximately half a meter, the slope should be increased to a minimum of 5%. Either leveling the screed or removing the heat-insulating layer ensures the change in slope.

The following formula is used to determine the number of water receivers: the distance between each funnel must be at least 50 cm, and each funnel’s surface voltage cannot exceed 200 kV. m. 10 cm is the minimum pipe diameter. It is recommended to install a minimum of two funnels, or one funnel plus storm stock, regardless of the size of the roof. When the water intake becomes clogged, this will prevent flooding.

The amount and frequency of precipitation in this area are taken into consideration when determining the number of water receivers and their specifications.

The device of the internal spillway system: installation of funnels

First choice. The most useful composite funnels are those with two sections making up their body. Unlike hard structures, these funnels compensate for the movements of the insulation because of a certain dynamic reserve.

Installing the lower portion of the composite funnel into the prepared passage hole sliced in the roof overlap is the first step in setting up the water receiver device. The lower portion is inserted into the drain pipe, and the fasteners shouldn’t be too tight to prevent temperature deformation-related damage to communications.

The outer part of the funnel to create an internal drain is installed on top, passing through the roofing carpet and a layer of insulation, it is inserted into the lower part. Between the parts of the funnel, a ring seal is provided. The plastic apron of the upper part should be laid on the lower lining layer of the roofing material. An additional lining layer is mounted on top of it and a bitumen apron is melted as the next waterproofing layer. The outer layer of roofing material is mounted on top of the apron, which is started into the funnel bowl and is fixed with a clamping ring and stainless steel mounting elements. At the last stage of the device, a protective grill is installed on the funnel.

The second option. The device of the water receiver with a clamping flange is performed in several stages. It is recommended to fix the funnel not to the insulation, but to the wooden bars of the suitable section, securely fixed on the base of the roof. The funnel is tightly installed in the hole (it must be rigidly fixed), between the flat side of the funnel and the clamping flange, the rubber -knitting sealing is installed, which is laid under the roofing carpet. At the next stage of the device, the metal clamping flange is fixed with a special stainless steel fastener. For the installation of fasteners in the flange, sealing gasket and side of the funnel, holes are provided. At the end of the installation, the lid is fixed.

The product’s configuration and the kind of roofing determine the water intake funnel’s working principle. It is essential that you install it according to the manufacturer’s instructions.

Water receivers that are heated

In cold climates, the drainage funnels must be heated during the winter to avoid ice buildup in the pipe and surrounding sections of the horizontal pipeline. It is advised to heat these drainage system components because the freezing depth can drop as low as 1.5 meters.

Since the ice is the last to the last turn and is surrounded by sunlight and a thermal insulator (a layer of insulation in a roof pie), the freezing of water in pipes and pipes causes flooding on the roof during the thaws and melting of snow.

There are now funnels for flat roofs that come with an integrated heating system. However, by themselves, they are unable to resolve the issue—in this case, an ice traffic jam will develop outdoors. It melts more quickly than the internal, of course, but it can also cause serious issues by obstructing the water’s path down the drain.

Provide a self-regulating heating cable for the roof to the area surrounding the funnel so that the water drainage system can run efficiently all year round. In this instance, the likelihood of an ice-related drain blockage is eliminated.

The efficient water receiver device, the well-maintained heating system, the routine cleaning of the funnels to remove debris, and the functional repair of the systems’ components as needed.

Flat roof drainage funnel device and types. The intricacies involved in the installation and heating of an internal drain on a flat roof.

Distribution funnels for flat roofs

There are two types of distribution systems: open and closed. The majority of pitched roofs have open ones, where a gutter runs around the edge and water runs into the pipe’s funnel. From there, the water flows into the drainage system and collector, stopping just short of the facade (to prevent the base from washing and seeping into the foundation).

Flat roofs are used with closed. Here, the roof’s angle of inclination is too great, causing the water to flow into the gutter. Furthermore, a parapet frequently encircles flat roofs, preventing water from potentially falling through the roof. Here, gutters designed for flat roofs are utilized. Rain and melted snow pass through them and into the riser that runs through the house.

The funnels are situated in the flat roof’s lower portion, which also has a slight slope. I’ll briefly explain these funnels to you, along with the installation’s features and options.

Why are gutters needed on a flat roof

The water on the roof will stand still in the absence of the outflow device. This is bad because water erodes the coating over time, seeps into the roof pie’s thickness, ruins the insulation, and enters the house through the overlap.

The drainage funnels can take the place of the external system, groove + pipe, if there is no parapet and the flat roof has a discernible slope (up to 10 degrees).

Alternatively, the least successful solution would be a flat roofed gutter node. The only benefit is that it saves money on installation and purchases. Everything else is problematic: a disorganized spillway reaches the foundation and distorts the soil close to it. Not very pleasant are the water streams above the front door.

In theory, any external drainage systems are not taken into consideration when there is a continuous parapet.

Device and types

The funnel’s parts are the glass, cap, and wide side.

There are two sizable categories within the systems themselves:

• Traditional. There are many pipes in the house, there are also many funnels. Systems are mounted on overhangs or special protrusions located on roof lowering with a slope of 3 degrees. When using such a system, funnels are placed every 25 meters. All of them are connected to one riser.

• Gravitational-vacuum. The principle of operation is an ejectic effect, in this case – the ability of one environment to carry another. When forming a vacuum in the riser, water under the pressure of air masses is dragged into the riser at high speed.

Calculation of gutters on a flat roof

The funnels are installed with a minimum of two pieces per roof, based on a calculation of one piece for 150–200 square meters. T.e. You will need two for a small house measuring ten by ten, two for a fifteen by fifteen, three for a roof covering more than three hundred square feet, etc. D.

Features of choice and installation

Metal and plastic are the materials used to make funnels. Typically, they base their decision on the material used to cover the roof:

• If it is a folder or metal -profile roof, then the funnels are chosen from metal;
• For bituminous and polymer coatings, funnels of polymer compounds are preferred.

Installation prerequisites:

• The connection of the funnel with the roof should be perfectly sealed. At the junction, it is recommended to lay additional pieces of waterproofing. Moreover, insulation should be glued directly on board the funnel;
• If there are two waterproofing layers of the edge of the funnel on the roof, placed between them;
• The funnel should be equipped with a removable lid and protected by an umbrella from dirt;
• The cap should be fixed well;
• In order to avoid freezing of water in the riser, heating the funnel of the gutters on a flat roof is necessary;

Who produces drainage funnels and at what price

Technonikol distribution funnels for flat roofs. 110, 90, and 160 in diameter. both with and without a leaflet, a crimping flange, and heating. Price range: 300 to 4.5 thousand rubles.

Finland’s SK Tuote Oy. Priced between 800 and 4,000 rubles, the diameter ranges from 7.5 to 16 centimeters.

"Technoresurs" in French. 11-16 mm in diameter. The price range for funnels with a leaflet filter is 400–4,000 rubles, depending on whether they are heated or not.

Installing gutters and pipes from the facade is far less complicated than installing the internal drainage system. Without the necessary tools and training, this task cannot be completed.

Flat roofs frequently have a parapet around them to prevent water from penetrating the roof. Here, gutters designed for flat roofs are utilized.

Roofing funnels for flat roofs HL

We would like to bring roofing funnels for flat conventional, inverted, exploited, and "green" roofs to your attention. More than fifty different roof funnels are made by HL, and they fit all kinds of roofs. Since navigating through such a variety can be challenging at times, our staff members will, in accordance with your roofing "pie," provide a funnel at no cost to you and, if needed, draw a sketch of the gutrons node.

A funnel with a roof, an electric heater, a ladder, thermal insulation, a stainless steel pendant flange, and a vertical release for DN 110 or DN 75, DN 125, or DN 160

A funnel with a roof, ladder, thermal insulation, a stainless steel squeezing flange, and a vertical release for DN 110, DN 75, DN 125, or DN 160

Covered funnel with electric heating, vegetation, thermal insulation, polymerbitum canvas waterproofing, and vertical release (DN 110 or DN 75, DN 125, or DN 160).

Roofed funnel with foliage, DN 110 or DN 75, DN 125, DN 160 vertical release, thermal insulation, and waterproofing polymerbitum canvas

Roofing funnel with a polypropylene body for gluing FPOs, electric heating, foliage, thermal insulation, and a vertical release of DN 110 or DN 75, DN 125, and DN 160

A fpo canvas can be adhered to a roofed funnel with foliage, thermal insulation, and a polypropylene body that can be released vertically to accommodate DN 110, DN 75, DN 125, or DN 160.

Covered funnel with a polyvinyl chloride case for gluing PVC membrane, foliage, electric heating, thermal insulation, and a vertical release of DN 110 or DN 75, DN 125, and DN 160

A polyvinyl chloride case for gluing PVC membrane to a roofed funnel with foliage, thermal insulation, and a vertical release of DN 110 or DN 75, DN 125, or DN 160

Roofed funnel with an electric heater, foliage, thermal insulation, and a stainless steel pendant flange with a vertical DN 110 or DN 75, DN 125, or DN 160 release

A foliage-covered, thermally insulated roofed funnel with a stainless steel squeezing flange and a vertical release for DN 110 or DN 75, DN 125, or DN 160

Roofing funnels are an essential part of keeping flat roofs functional and intact. These funnels, which are made to aid in proper drainage, are essential in keeping rainwater off the surface of the roof and avoiding pooling and possible structural damage. They reduce the risks associated with standing water and help to prolong the lifespan of flat roofs by effectively channeling water towards designated outlets.

The ease of use and efficiency of roofing funnels is one of their main benefits. Strategic mechanisms are needed to ensure that water does not accumulate on flat roofs, in contrast to sloped roofs that naturally shed water. In order to safely divert rainwater away from buildings, funnels gather rainwater and direct it towards downspouts or drains. This preventive measure helps to maintain the building’s overall structural integrity in addition to safeguarding the roof.

The fact that roofing funnels can be used with different flat roof configurations adds to their usefulness. These funnels can be made to fit a variety of flat roof sizes and types, whether the roof is being used for commercial, industrial, or residential purposes. This adaptability guarantees that appropriate drainage solutions can always be implemented successfully, regardless of the size or architectural style of the roof.

To sum up, roofing funnels are essential to the upkeep and durability of flat roofs. They lessen the chance of water damage and structural deterioration by avoiding water accumulation and guaranteeing effective drainage. They are crucial for any flat roof system because of their simple construction and versatility, which give building owners peace of mind and enhance the building’s general robustness and functionality.

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