Calculation of a gutter deck pipe example. Drainage calculation, roof drainage system calculation

• House length (cm) (L)
• House height (cm) (H
• Number of corners of the house

To find out the exact price for the Alta-Profil gutter system, you can call the nearest partner of our company in your region - all phone numbers and addresses are located on a special page. And so that you can make a preliminary estimate of the cost of materials for installing a drainage system, we offer you a convenient online calculator.

What do you need to calculate the drainage system using a calculator? Just prepare the initial data about your project and enter it into the fields of the calculator. The result obtained depends on the accuracy of the following parameters:

• The number of roof slopes - depends on the type of roof (gable, tent, hip, mansard, etc.);
• The length of the lower perimeter of the roof slopes;
• The height of the walls from the lower edge of the basement to the overhangs of the roof slope.

Using our calculator, you will find out the approximate cost of gutters, which is also influenced by other factors. For example, this is the choice of the design of the drainage system (Elite or Standard), the material of the walls of the building. Also important are the possibility and methods of installing fasteners, the presence or absence of a storm system, protrusions on the walls, the distance between the roof overhangs and the wall of the building. All this information will be required in order to clarify the calculation of the drain in the future when ordering material and select the necessary set of elements for its installation.

How to calculate the drainage system?

Upload date: 2014-12-29

How to choose the elements of the drain?

The number of types of elements is quite large, and they cost differently. But in each case, you will need your own configuration option to assemble reliable and efficient plastic gutters. The cost of such a kit in its final form can only be made by a specialist - after careful measurements and evaluation of the design features of the structure.

A large amount of rain falls on the roof of any building.

So that they then do not flow down the walls and do not seep into the ground under the foundation of the house, it is necessary to arrange a reliable drainage system.

In total, there are two types of drainage systems in construction:

• unorganized;
• organized.

When water flows down the slopes of the roof directly onto the blind area of ​​the building, this is called an unorganized system.

When a gutter structure is installed on the roof and water is discharged to a certain place, then such a system is called organized.

Unorganized drainage is mainly used on flat roofs.

The advantage of this method is only one - you do not need to spend money on gutters, pipes, fixtures and work.

And there are a lot of shortcomings!

Water contributes to the destruction of walls, plinth, blind area.

The foundation wears out much ahead of schedule.

If people walk under the house, then the water falls directly on them.

An organized drainage system from the roof of a house is a completely different matter!

Water does not fall on the structural elements of the house and they serve as much as possible.

After all, special drainage units are installed to drain water and the water goes to a specially organized place.

Also, the drainage system has certain aesthetic functions.

The house, on which the drainage structure is not installed, has an unfinished view.

It looks like there are no curtains in the room.

And if the type of drain is chosen correctly in terms of design, then it will become an additional decoration of the house.

How to calculate correctly

Where does the calculation of the water runoff begin?

The main characteristic of the drainage system is its throughput.

That is, a certain amount of water that the system can easily remove from your roof.

Let's look at an example of how the calculation is performed.

We calculate the area of ​​​​water disposal.

First you need to calculate the area of ​​\u200b\u200bthe roof from which water must be drained:

S \u003d 5.5 x 12.5 \u003d 68.75 square meters. meters.

Now we use the formula:

Q \u003d S x q / 10000 \u003d 68.75 x 267 / 10000 \u003d 1.84 liters / sec.

The number 267 is the maximum rainfall intensity.

Each region has its own.

Now we take a table that shows the throughput of the systems:

And we select a specific system.

For our drainage area, the X1 system will be the most effective.

That is, when the riser is installed on the corner of the building.

Such a system has a throughput of 1.91 liters / sec.

Knowing our throughput, it is easy to calculate the required number of risers:

N = Q / qn = 1.84 / 1.91 = 0.96.

That is, one riser is quite enough for us.

Video about the gutter system of the roof

Sergey Novozhilov is an expert in roofing materials with 9 years of practical experience in the field of engineering solutions in construction.

I am Mikhail, the director of the company, I have been working exclusively with roofs for more than 15 years. Below I will tell you about the intricacies and secrets of materials for the roof. If you have any questions, I'll be happy to answer and help.
Mikhail, LLC "STM-Stroy"

Not a single house can do without drains: too much damage can be caused by spontaneously falling water from overhangs. In order to competently and efficiently arrange a spillway, a drainage system is calculated.

Calculation of the drainage system according to SNiP

In accordance with the Norms and Rules, the following characteristics should be taken into account in the calculation:

• total roof area;
• average annual rainfall;
• temperature minimum in winter in the area.

Rainwater drainage must also be taken into account.

When calculating the drainage for the roof, it is determined:

• Number of gutters: total length of the eaves divided by the length of one gutter.

In this example, the total length of the overhang is 36.4 meters. Subtract the length of the corner elements (20 cm per side 12 * 20 cm = 2.4 m), it remains 36.4-2.4 = 34 meters. The length of 1 gutter is 3 meters. So you will need to purchase 12 gutters (34/3 = 11.3 pcs.).

• The number of couplings for gutters - according to the number of future connections;

In the example in the photo, you will need to buy 16 couplings:

• Number of brackets for fastening the gutters: total length of the gutter divided by the step between the brackets (60 cm for plastic, 70 for metal);

• If the system is not closed (there are gutters with open ends) - the number of end caps. For example, on a gable gable roof there will be two strings of gutters and, accordingly, four plugs.

note

• Corner elements of gutters - depends on the number of external and internal corners of the house. When calculating the total length of the gutter, you need to take them into account too, in order to minimize the amount of waste;

• Calculation of drain funnels - by the number of pipes;

• Pipes: the number depends on the number of drains and the height of the house. Curved knees are selected depending on the width of the overhang;

• Clamps - one piece for each section connection. For example, if one three-meter pipe is used for one drain - two clamps, at the top and bottom.

The pipe outlet is located 30 centimeters from the ground (or 15, if there is a collector).

Related Articles

Calculation of drainage by roof area

The final stage of building a house is the installation of a drainage system. In this article, we will consider the types and features of the drain. We will figure out how to correctly calculate the number of necessary elements, depending on the type and complexity of the drainage system.

The main task of the gutter is to drain water from the roof of the house. For the normal operation of the system, its throughput is important, therefore, the first point in calculating the drain is the choice of the type of system, as well as the diameter of pipes and gutters.

As a rule, in small private houses an external system 120x90 is used, where 120 is the diameter of the gutter, 90 is the diameter of the drainage pipes.

For large cottages and houses, it is preferable to use the 150x100 system. Its bandwidth is enough to function normally even in heavy rain.

There are formulas for accurately calculating the volume of rainwater depending on the area of ​​​​the roof, the region, the intensity of precipitation, but ordinary citizens do not need to delve into such subtleties.

It is enough to know the total area of ​​\u200b\u200bthe roof, plan the location of the drain pipes and, based on this data, select the diameter of the drainage elements.

Initial data

For the correct calculation and selection of a drainage system, it is necessary:

1. Measure the height of the house. The measurement is made using a construction tape measure. The distance from the blind area (ground) to the edge of the eaves is measured.
2. Measure the length of the cornice on all sides of the roof. It is important to know the length of each slope, since the accuracy of calculations of the required number of structural elements depends on this.
3. Calculate the total area of ​​the roof. Based on the data obtained, it is possible to optimally select a drainage system.
4. Calculate the number of external and internal corners of the roof.

Important: if the roof of your house has a complex structure with a large number of corners, then for the correct calculation of the elements of the drain, it is better to use online calculators from the system manufacturer.

The estimated collection area of ​​the gutters, depending on the diameter and location of the drain pipes.

A gutter with a diameter of 110 mm, when installing a drain pipe in the center of the slope, is capable of serving up to 177 m2. A gutter of the same diameter with a drain pipe installed along one edge of the slope serves up to 89 m2. The gutter with a diameter of 120 mm is capable of receiving water from an area of ​​238 m2, and the 150th from 380 m2.

Installing a drain pipe along one edge of the slope with a gutter of 120 mm, it is possible to ensure the drainage of water from a roof with an area of ​​118 m2, and the 150th, under similar conditions, can cope with maintenance of a roof with an area of ​​up to 190 m2.

The catchment area of ​​the drain pipes, depending on the location.

A pipe with a diameter of 70 mm, when installed in the center of the slope, serves up to 217 m2 of roofing.

By installing this along one edge, it is possible to provide drainage from an area of ​​\u200b\u200bup to 149 squares. The 90th pipe, with a central location, is capable of collecting water from 355, and 110 from 620 square meters.

By shifting the 90th and 110th pipes to one edge of the slope, the catchment area will decrease and will be 245 and 423 m2, respectively.

It is obvious that the installation of bends in the center of the slope is more profitable, because. with the same pipe diameter, the throughput of the system is much higher.

systems, one drain section should serve no more than 12 running meters of drainage. If the length of the drain on one side of the house exceeds 12 meters, then two or more should be installed, depending on the total length.

Kinds

Based on the name of the drainage systems, you can understand what is their difference. outdoor system mounted around the perimeter of the eaves in such a way that the water flowing from the roof falls directly into the gutter and then, due to the slope, moves towards the drain pipes, through which it descends to the ground.

With such a scheme for draining rainwater, drain pipes can be placed almost anywhere along the perimeter of the roof, and water can be directed by adjusting the angle of the gutters.

The outdoor system is preferable for private houses or multi-storey buildings with a gable or hip roof.

Internal gutters are mounted inside the building, and, as a rule, only drains are visible from the street, gutters are built into the roof, or they may not be at all.

Such systems are used mainly for flat or slightly concave roofs with a soft roof. The design can work on the principle of a sink.

Calculation of the internal drain for a flat roof

To calculate the drainage of internal systems, you will need to measure the perimeter of the roof and calculate its area.

The total length of such a drain will be equal to the length of the perimeter of the roof.

It is important to know the length of each side of the roof and the number of corners. Depending on the drainage scheme, the number of drain pipes is different, but the total length of the pipe is constant and equals the height of the building, so the distance from the ground to the edge of the roof must also be measured.

If it is planned to arrange an internal drain according to the funnel principle, then the length of the drain pipe depends on how it will be located inside the building. Such a structure should be planned and mounted at the stage of wall construction.

Number of funnels

Please note that at least two drain funnels must be installed on the flat roof of the building and in one valley. If one is clogged, the other will work.

The length of the roof along its longitudinal axis is divided by the number of funnels, get the step between the funnels.

Calculation example for an internal drain(SNiP 2.04.01-85* p. 20.9.)

2500 (roof area with a slope of 1.5%) * 80 (l. / s. with GA) / 10000 \u003d 20 hp at a rate of 10 cm per funnel - 12 hp, therefore, for an internal drain, 2 funnels are needed 10 cm

outdoor system

The classic scheme for the drainage of a private house is external. It is easy to calculate and mount even without skills in construction.

As mentioned earlier, for the calculation you will need to measure the perimeter of the roof and the distance from the ground to the eaves. To calculate the exact number of structural parts, it is necessary to understand what it consists of and the rules for installing the system.

For the convenience of making calculations, it is most convenient to schematically depict the roof of the house and the location of all elements of the drain on a piece of paper. Indicate all known dimensions of the future design.

What is an outdoor drain made of?

The main structural elements are drain pipes and receiving chutes. Corner elements, branch, connecting and fastening elements are also used.

For systems in which drains are installed in the center of the slope, the function of the connecting elements can be performed by branch ones. The appearance of structural details may differ depending on the manufacturer of the system, but the principle is the same for everyone:

• connecting- used to connect the details of the gutter;
• corner- can be external or internal, or combined with branch;
• branch parts designed to connect gutters with receiving elements;
• plugs are installed along the dead ends of the gutters;
• gutter fasteners, metal plates that are mounted on the crate;
• drain pipe fasteners;
• drain- is installed at the end of the outlet pipe, it is necessary to adjust the direction of wastewater with an open drainage system;
• drain pipe socket and elbow, designed to connect and change direction.

Rules for mounting the structure to the roof and walls of the house for a specific model of the gutter manufacturer. This information can be found on the manufacturer's website.

Calculation example

For example, you need to calculate a PVC drain from the Alta Profile company. The fasteners of such a plastic system, according to the recommendation, should be installed at a distance of no more than 60 cm.

During heavy rain or heavy snowfall, a significant amount of precipitation collects on all roofs of buildings. So that they do not fall into the ground under the foundation or do not roll down the walls, it is necessary to equip the drainage structure. It is impossible to perform this work qualitatively without the correct calculation of the roof drainage system.

Two types of roof drainage

Drainage systems are:

• disorganized;
• organized.

When the water flow flows down the roof slopes to the blind area of ​​the house, then such a system is called unorganized. It is mainly equipped on flat roofs. Such a system has practically no advantages, except that you do not need to spend money on the purchase of components and pay for the work of the masters.

But she has a lot of shortcomings:

1. Water flows cause the destruction of walls, blind areas and basement.
2. The service life of the foundation is reduced.
3. If people move close to the building, then jets of water fall on them.

When a gutter structure is mounted on the roof, and the water is diverted to a specific place, then this is an organized system and it has many advantages:

1. Water does not get on the structural elements of the buildings and therefore they serve for a long time.
2. To divert fluid flows, special drainage units are made, as a result of which water flows to a specially equipped place.
3. The drainage structure performs a certain aesthetic function. If it is absent on the house, then the building has an unfinished look. When the gutter is chosen correctly in terms of design, it will certainly be an additional decoration of the building.

Bandwidth

One of the main characteristics of gutter structures is its throughput, which is directly affected by the diameter of the gutter for the roof. Thanks to this parameter, you can find out the volume of liquid that it is able to divert from the surface of a particular roof.

In order to correctly perform the calculations, it is necessary to take into account the type of roof, its configuration, as well as the climatic features of the region regarding the frequency and abundance of precipitation.

If a mistake is made in the process of calculating the drainage, then the system will not cope with the water flow that comes in the event of heavy rains or rapid melting of snow masses. Water in this case will begin to overflow over the edges of the gutters and there will be no benefit from such a design.

When calculating the amount of precipitation falling on the drainage area, use the formula:

Q = S x q: 10000, where

Q is the desired value, expressed in liters per second;

S - the surface area of ​​​​the roof from which water must be drained, measured in square meters;

q is the maximum intensity of precipitation in l/(s x ha).

Counting downpipes per roof area

First, the type of gutter structure is determined, which depends on the configuration of the roof. When calculating gutters for a pitched roof, they are required one for each slope. If a hip roof is being erected, then a closed drainage structure is required. The more complex the projected configuration, the more carefully the calculations must be made.

Next, you need to find out the number of downpipes per roof area. Usually one pipe is enough for 70 - 100 square meters. It should be noted that in the case when the entire surface area of ​​\u200b\u200bthe gable roof is less than 100 "squares", the installation of two pipes will still be required - in accordance with the number of slopes and gutters.

In closed systems, the calculation of a drainpipe for a roof is based on its total area, but the results obtained are rounded up. For example, if the area is 220 sq. meters, then it is better to install 3 pipes than to hope that two will be enough. Vertical pipes for the drain are sold in three-meter segments.

To find out the required number of pipes, proceed as follows:

• measure the distance from the bottom of the roof to the ground and subtract 0.3 meters;
• the result obtained is divided by the length of the pipe segment;
• multiply it by the number of vertical risers and round the total up.

As for the calculation of the diameter of the drainpipe, this can be found from the ratio: 1 cm² of section per 0.75 -1 m² of roofing.

Calculation of other elements of the roof drainage system

To select a specific drainage system, you can use data on the actual throughput of downpipes and other elements of it. This information is contained in the documentation provided by the manufacturers of these products.

Before you purchase a system, calculate the required number of components:

1. gutters. Manufacturers produce these products in different lengths. As a rule, for iron gutters it is 2 meters. As for these plastic elements, they are 3 and 4 meters. The number of gutters must be selected so that a minimum of waste is obtained during the installation process. For example, the length of the eaves of the house is 12 meters, it will not be difficult to calculate the desired value. But with a cornice length of 10.5 meters, then you need to purchase two 4-meter products and one 3-meter gutter.
2. Couplings. They will need one less than the gutters purchased.
3. Brackets for attaching gutters. When calculating, use the formula N \u003d (L - 0.3): 0.6 + 1, where N is the desired value, L is the length of the cornice and 0.6 meters is the recommended distance between the cornices. Substituting the number 12 (the approximate length of the cornice), we get N \u003d (12 - 0.3) / 0.6 + 1 \u003d 20, 5 or 21 brackets.
4. Stubs- elements installed on the end of the gutter. They are needed when arranging an open system.
5. External and internal corners. Their number depends on the configuration of the roof, since the more complex its profile, the more corner elements are needed.
6. Funnels for drains. It is easy to find out this value: how many drainpipes are to be installed, so many funnels will be required.
7. Pipe Elbows. To do this, you need to know the width of the overhang of the eaves and the distance from the eaves to the ground.
8. Risers. The calculation is made according to the formula N \u003d Q: qn, where Q is the volume of precipitation, and qn is the throughput of the drainage system.