One of the key stages in arranging a roofing system at home is the drainage system. Without its organization it is impossible to protect the facade of the building from rain and water flows during the melting snow.
How to properly install the gutters and what to consider when installing the structure, we will consider in the article.
Highlights when designing gutters
The question of how the gutter system will be equipped should be decided at the construction design stage.
When making calculations, you need to be guided by the requirements of the current SNiPa 2.04.01-85. This approach will allow, taking into account all the nuances, to correctly select the optimal design option.
The key purpose of the drainage system is to collect and discharge precipitation, thereby protecting the walls and foundation of the building from premature destruction
The main points that should be followed when designing a drainage system:
- Having made a copy of the roof drawing, draw a plan of the location of the drainage elements.
- Calculate the total area of the roof and all its slopes separately, taking into account the adjacent vertical walls.
- Based on the indication of the intensity of the rains in the area, determine the throughput of the system.
- In accordance with the obtained values, determine the diameter of the mounted downpipes, the number and cross section of the drain funnels, as well as their frequency along the wall of the building.
The result should be a system capable of collecting and draining the maximum amount of fluid.
At the design stage, it is important to determine the location of the risers so that they do not violate the exterior composition. Most often they are placed in the corners of the building, but it’s quite acceptable to equip them in a niche created by the bay window.
If the discharge of the outgoing pipe from the gutters will be carried out to the blind area, the risers should be removed as far as possible from the entrances to the basements, basement ventilation outlets and pedestrian walkways laid near the house.
The components of the drainage system
The system includes two groups of parts - horizontal and vertical drainage parts. Together they include about a dozen types of structural elements, each of which performs the task assigned to it.
The main thing when choosing the components of the drainage system is to select elements that, both in a constructive plan and in appearance, harmoniously complement the overall picture
The structural elements of the drainage system are:
- drainpipes - key functional elements of the system designed to move water masses from the roof;
- gutters - narrow channels for collecting and redirecting water;
- funnels - conical sockets in the upper part of the pipe are designed to collect, delay and drain water flowing down the gutters;
- knee - structures in the form of short bent pipe sections are installed to change the direction of water flow;
- brackets - fasteners for fixing the gutter to the roof;
- seals - additional elements provide fastening strength at the joints;
- clamps - fasteners for fixing the structure to the facade of the building.
When constructing a gutter system on long-sloping roofs, guide rails are additionally installed. Their main purpose is to reduce the flow rate of water along the roof surface.
The structure assembled from the guide grooves is positioned almost parallel to the ridge so that it collects the entire stream of rain water rolling down from the roof
The shape of the gutters and brackets can be any. There are products with round and semicircular sections, U-shaped and trapezoidal in shape.
The gutters differ in the way they are connected to the bracket. The easiest way to install systems that require fixation through a simple snap. The rotary latches included in the package provide an opportunity to dismantle part of the gutter without special efforts if it is necessary to replace or carry out repair work.
The drainage funnels are universal, they can be installed anywhere in the drainage system. The plugs covering the gutters come in two versions: left- and right-handed.
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The components of the drainage system
Place the catchment funnel
Vertical gutters
Stormwater drainage device
The connection of drainpipes and the laying of water outlets from the base of the building cannot be performed without the use of knees. Their number is determined on the basis of the fact that for each drain pipe it is required to install three elbows: one at the bottom and two at the top.
Clamps are used to fix the gutter structure to the building facade. For metal water pipes, fasteners with screw elements and a long hairpin are chosen. For PVC structures - plastic clips with two support points.
Material Type Choices
The price of the drainage system depends on several factors, one of which is the material of manufacture. The modern market offers a lot of options for the materials that you can choose when arranging a drainage system. The choice largely depends on the appearance of the building and the aesthetic ideas of its owner.
Drainage systems made of galvanized steel were installed in houses of the old construction, today consumers are increasingly choosing constructions made of polymers
The most widely used products made of polymers and metal.
Each species has its advantages and disadvantages:
- Plastic - lightweight, durable and at the same time quite easy to process material. At a low price, it shows excellent operational parameters. Installation of PVC gutters does not cause special difficulties.
- Galvanized steel - Stronger and more durable material than polymer. To give the product a more presentable appearance, manufacturers cover the steel with a polymer coating.
- Aluminum - lightweight and easy-to-use material, the service life of which reaches over half a century.
- Copper - beautiful, durable, but at the same time quite expensive metal. But it is vulnerable to the damaging effects of electrolytic vapors. To minimize the risk, all elements of the system should be made of one material.
The polyvinyl chloride used to manufacture components is much lighter than metal. This makes it possible to install brackets having a smaller cross section, without losing mechanical strength of the structure. But when installing PVC structures, linear size fluctuations should be taken into account.
In order to partially compensate for dimensional fluctuations, manufacturers equip the gutters with special couplings, which have on the inside of the notch
Compensating couplings enable the main elements of the system to shorten and lengthen without risk of deformation. They are also used in the installation of metal gutters, despite the fact that they have much less thermal expansion.
EPDM rubber acts as a material for the manufacture of seals. It is a modern analogue of rubber.
EPDM rubber used in the manufacture of seals is known for its high elasticity and the ability to quickly return to its original shape even after a long service life
To further protect the rubber and simplify the installation process, the seals are additionally treated with silicone grease.
Gutters produce sections of one to four meters. They come in a rectangular and round section. On their performance, this is not displayed. The choice is limited only by the design solution of the drainage system and the design solution of the facade of the house.
When purchasing drainpipes made of polymer materials, keep in mind that they have the same diameter along the entire length. And therefore, to connect them to each other, it will be necessary to use special couplings, which entails additional costs. We also suggest that you familiarize yourself with the article in which we examined the pros and cons of plastic and metal gutters.
Calculation of the required number of elements
It is better to entrust this rather important event to specialists selling drainage systems, or to masters of the company providing installation roofing services. In the absence of such an opportunity, the calculation can be performed on their own.
Since in private construction many people try to get away from typical options and roofs similar in design, the required number of system elements should be calculated individually
The main points of competent calculation:
- Gutters. The total length of the channels should correspond to the length of all the roof slopes used to collect water. Their docking is carried out using connectors.
- Water intake funnels. They are installed in the outer corners of the building and additionally placed every 8-12 meters so that the total slope of the channels is not too large.
- Drainpipes. The number of products corresponds to the number of funnels, and the length corresponds to the distance from the roof to the surface of the earth.
- Brackets. The number of brackets is determined based on the fact that for each meter of the channel one element is required. Additional holders will be required for the funnels in the center and wall and in the corner of the house.
The number of clamps directly depends on the height of the building. But in any case, each separately installed pipe section is fixed with at least one clamp. When installing a drainpipe in a one-story building, often three fasteners are located at the top point, bottom and in the middle of the product.
Using the plan, it is convenient to divide the surface of the roof into equal drainage areas, served by nearby drains, and calculate the area
In the calculation, the condition is taken that for 1 square meter of roof in horizontal projection there should be 1.5 square centimeters of the cross-sectional area of the drain and funnel. For example: the cross-sectional area of a pipe D 100 mm is 78.5 sq.cm. This is an average value.
Depending on whether it is necessary to install the system in regions with high rainfall, or, conversely, in arid areas, the calculations are amended.
Bracket Mounting Methods
Install the brackets according to the rules is still at the stage prior to laying the roof. If fixing is done after the coating has been laid, then ordinary short hooks are used as fasteners.
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Step 1: Trying on a short hook to the installation site
Step 2: Attaching the highest holder
Step 3: Verification of the slope formed by the holders
Step 4: Fixing the ordinary gutter holders
Depending on the shape of the bracket, you can fix the elements in one of three ways:
- Fixing to the windshield of the roof - it is used when it is necessary to install the system on the finished roof.
- Rafter mount - used at the installation stage, preceding the laying of the roofing material.
- Bottom fixation flooring or the first battens lath - used for roofing, the step between the rafters of which exceeds the mark of 600 mm.
Brackets designed for fixation to the frontal roofing board are most often included in the package of systems made of polyvinyl chloride.
Suspended structures for fixing to the windshield have reinforced vertical ribs, so they can easily withstand heavy loads
Metal brackets for attaching to the frontal roofing board are made shorter. If a windshield is not provided for in the roof structure, combined brackets are used.
They are equipped with extension cords made of steel. Due to this, it is convenient to attach them directly to the rafter leg.
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Step 1: Mark long slope brackets
Step 2: Bending Long Metal Brackets
Step 3: Layout the bent arms along the ramp
Step 4: Marking the holder line
In case it is impossible to provide access to the rafters, metal crutches are attached to the wall. ” They act as a support for the further fastening of the metal gutter.
The fixing method, which involves attaching to the rafter leg, is effective in arranging roofs of houses in regions with heavy rainfall. Apply it and, if necessary, drain water from roofs with a large area, for the shelter of which heavy coatings are used.
When performing fastening on the rafter leg, to increase the reliability between the fasteners, maintain an equidistant distance equal to 50 centimeters
In this method, the hooks are brought in behind the base and set at an equidistant distance in order to provide the desired slope of the gutter.
The third fixation method, which involves fastening to the crate, is most often used in the arrangement of a roof having a coating of ondulin or metal. It is chosen only if the recesses cannot reduce the bearing capacity of the crate in the area of the cornice.
To fix the counter battens on the battens, use combined models of brackets or metal long hooks, deepening them into the long grooves of the mounting rails
When choosing the third method, it is important to remember the fixation, that only strict observance of the installation rules and installation procedure can ensure the reliability and durability of the structure.
Gutter Installation Technology
Installation of equipment for gutters is carried out after the completion of the facing work. In how to prepare and install the drain, there is nothing complicated. Installation of a PVC system can be performed even by a novice master.
The assembly and installation of the drainage system includes a number of standard steps:
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Ideally, the gutter system is installed before the roof is laid. But in the case of a piece of coating, you can remove the bottom row of tiles and do the work
Before mounting the brackets, we select the optimal position of the extreme holders. They should provide a bias towards the drainage funnel, the width of the gutter should 1/3 protrude beyond the edge of the cornice
According to the mark, we bend the legs of the two extreme brackets located at the highest and lowest points of the gutter
After installing the two extreme brackets, we connect them by pulling a fishing line or twine. This line is needed for precise marking of ordinary holders
For building levels, check the slope created by the holders
The edges of the gutter located near the corner of the slopes are closed with plugs to prevent water from draining past the funnel
If the length of the equipped ramp is more than 3 meters, then we increase the gutters using a connector that compensates for linear expansion
We fix the gutters installed on the brackets by bending the tab of the holder
Step 1: Installing an Optional Slat
Step 2: Trying on the bracket to determine the fold line
Step 3: Install the extreme gutter holder
Step 4: Layout Installation of Row Brackets
Step 56 Verify that the slope is correct
Step 6: Installing the plug on the edge of the gutter
Step 7: Connecting the gutter parts
Step 8: Fixing the Gutter with the Bracket Tab
After installing and fixing the gutters, drainage funnels are installed in the lowest points of the drainage system, to which drain pipes are connected:
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Step 9: Marking the Funnel Installation Site
Step 10: Drilling a hole in the gutter
Step 11: Attaching the Funnel to the Gutter
Step 12: Connect the downpipe to the funnel
Installation of horizontal elements
A set of tools that will be needed during the work:
- marking cord;
- tape measure at least 3 meters long;
- hacksaw for metal;
- universal screwdriver;
- a hammer;
- flat bend;
- pipe tongs.
Some craftsmen are cutting metal gutters and pipes using a grinder. But this is far from the best solution, since the rotating disk heats the polymer coating during operation. And this can cause damage to the drainage elements during operation.
First of all, mount brackets that are designed to support the drainage funnels, placing them at a distance of 5-10 cm from the elements
The installation of the brackets begins with the installation of the extreme elements. Then the distance between the drainpipes is divided into equal intervals of 60-80 cm long for the installation of the remaining hooks.
To simplify your task, ensuring a uniform slope of the gutters in the direction of the water intake funnels, it is better to pull the cord when marking. The boundary values of the slope are from 2 to 5 mm per linear meter. To increase the accuracy of the installation, it is better to identify several key lines by pulling a cord in two or three rows for this.
If you have to work with metal hooks, brackets, before fastening, they must be bent in accordance with the angle of the roof
During the mounting of the brackets, the slope is achieved by shifting the short fasteners vertically or by bending the metal holders in the calculated place.
In order not to disturb galvanization and not damage the polymer coating, a special device is used to bend the fasteners - a pliers.
The brackets are fixed on the mounting plate at three points, using self-tapping galvanized screws for this, not forgetting to adjust along the deviation from the direction specified by the cord
The collection of the drainage system can be performed in one of two ways:
- Lay out all the elements on the ground in a horizontal position, and then insert the assembled structure into the brackets fixed around the perimeter of the building. This method is applicable for small houses and small areas of decoration.
- The traditional option involves the phased assembly of all elements of the system directly on the building.
Installation of the gutter should be done in a “top to bottom” order: first, water inlets are installed, then the gutters are connected. This is dictated by the technological features of the drainage system.
In the traditional phased version of the assembly of all elements of the drainage system, the installation of the structure is carried out strictly to the principle of "top down"
Before attaching the gutters to parts of the roof, funnels are first mounted, not forgetting to take into account possible temperature expansion. Then the gutters are installed, placing them 2 cm below the line, which conditionally acts as a continuation of the overhang. They are released in segments of 3-4 meters long. Gutters that occupy extreme positions in the line will most likely have to be cut.
When installing the gutters, it is worth remembering that they must be at least a third covered by the eaves overhang. Ideally, the overlap should be half its own diameter.
The gutter is placed in the holders in a slightly bent state, leading into the grooves of the hooks, first its far side, and then the near side, and fixing by snap
The swivel element, connector or plug closes the gutter line. When joining the elements, an adhesive layer of 5 mm thickness is applied to the inner surface.
An important point: gutters made of polyvinyl chloride can not be joined in focus. This can cause cracking and damage to the structure.
Arrangement of a drain and drainpipes
To go from the funnel to the drain, use two knees and one straight section. For roofs with narrow cornices, the transition is collected by connecting only the upper and lower knees. The distance of the lower knee to the wall of the building is usually determined by the manufacturer.
The assembly of the gutter riser begins with the installation of a funnel, in the direction of which the slope of the gutters must be formed for spontaneous rainwater runoff:
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Step 1: Marking the funnel installation hole
Step 2: Cutting the hole for the drain funnel
Step 3: Fix the funnel to the gutter
Step 4: Connect the angle tap to the funnel
Funnel - the starting element of the gutter riser, to which it is connected. To connect at the top, two angular bends are used, which can be connected to each other if the roof has a narrow ledge, or connected using a pipe segment if the ledge is wide. Further:
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Step 5: Mark the downpipe trajectory
Step 6: Determining the position of the lower clamp
Step 7: Fixing Clamp Fasteners to the Wall
Step 8: Assembling and Securing the Gutter
Installation of drains should not cause special difficulties. Four-meter segments are easily joined together using couplings. Connect parts moving from top to bottom. A drain is attached to the lower end of the pipe with glue.
If you want to collect rainwater in a storage tank for use for economic purposes, a water collector is connected to the drain pipe:
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Step 1: Marking the installation site of the catchment
Step 2: Sawing the pipe to install the device
Step 3: Installing and securing the catchment
Step 4: Connect the water tank to the water tank
If the site is equipped with a storm system, the task is simplified - the drainpipe is simply taken out to the collection well, or it is placed 5-10 cm from the surface of the tray.
For the possibility of fixing the gutter riser, the placement points of the clamps are noted. The lowest point should be located directly above the drain. The riser clamps are not tightened so that the pipe at the moment of linear expansion can slightly move up or down.
In order for water to flow freely from the roof in the cold season, the gutters are equipped with a heating system. And how to do this, read in this material.
When planning to drain water to the blind area, the lower end of the pipe should be equipped with a bend that has a stem located at an angle of 45 °
The advice of professional installers is always useful if you want to install a gutter system on your roof yourself.
Tips for organizing a drainage system:
An example of assembly and fastening of elements:
Design and install a drain using a modern modular system under the power of any owner. The main thing is to have minimal construction skills and not be afraid of heights.
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