The construction of a concrete bowl, despite the emergence of new designs, is the most common option for the construction of stationary pools. However, this material has the ability to absorb moisture, which subsequently destroys the structure.
Agree, I would not want, having spent a lot of money on the construction of an artificial reservoir, to find cracks in a couple of years. Timely waterproofing of the pool will help prevent defects on the concrete bowl.
We will tell you about the most effective methods of protection against moisture, and we will also describe in stages the technology for equipping the hydrobarrier.
Why waterproof the pool?
Concrete is a strong and durable material, but it is characterized by increased porosity. Water that has seeped into the thickness of the material is easily absorbed and retained for a long time, becoming a favorable environment for the development of mold.
When exposed to subzero temperatures, such a wall becomes a conductor of cold, and freezing of the liquid leads to cracks and mechanical destruction of the structure.
Due to the porous structure, a concrete or reinforced concrete massif is not able to resist water seepage into the structure.
The device of reliable waterproofing of the inner surface of the pool bowl is not in doubt, since it is filled with water. However, destruction can also occur from the outside.
Concrete is characterized by the so-called “capillary suction” of a liquid, when moisture is drawn in from the environment - soil, air with high humidity, and atmospheric precipitation. In this regard, the outer side of the pool bowl is also subject to waterproofing measures.
When constructing a pool bowl from separate concrete slabs or blocks, poor-quality waterproofing leads to the gradual destruction and leaching of the solution in the joints and the occurrence of active leaks
Often the walls of the pool are erected from separate blocks. In this case, the joints are dangerous. The strength of the bonding solution is significantly lower than the strength of concrete slabs. Therefore, if water starts to seep in such a place, then under the influence of the pressure of the mass of liquid, the material quickly collapses.
First, drip seepage appears, then a small leak, which washes away the particles of the solution and turns into a decent leak.
The material for waterproofing the pool bowl should be compatible with adhesives for ceramic cladding or for polymer finish (+)
Moisture protection methods for concrete structures
Waterproofing can be superficial, internal or combined.
To ensure moisture protection of structures made of monolithic concrete or concrete blocks, the following tools are used:
- Deep Penetration Compounds - even microscopic cracks are clogged, working at the level of capillaries.
- Additives for sand-cement mixture - increase the hydrophobicity of concrete.
- Liquid glass - a composition that, after hardening, forms a solid, moisture-proof layer on the surface.
- Liquid and viscous compounds - the so-called liquid rubber and coating waterproofing, forming a durable elastic membrane.
- Roll film coatingsglued to the surface of concrete.
Each tool has its own characteristics that determine the scope and method of application.
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Implementation of waterproofing measures
Cement based treatment
Spraying polymer waterproofing
Laying a polymer membrane
Penetrating waterproofing compounds
Penetrating materials are cement-sand mixtures with active chemical additives. Diluted with water and applied to a well-moistened surface.
Active substances in the presence of water begin to react with particles of concrete mix - free lime. As a result, insoluble crystals of calcium hydrosilicates and hydroaluminates are formed.
Thus, the concrete is compacted deep - the active components of the waterproofing penetrate even the smallest cracks due to capillary suction. A moisture barrier is formed.
When all the water molecules have reacted, the crystal formation process stops. Resuming contact with the fluid starts it up again, causing even greater compaction and waterproofing.
Immediately after applying the protective layer, the active substances begin to interact with water molecules and particles of concrete, forming insoluble crystals. Capillaries and microcracks are filled, which subsequently blocks the ingress of water into the thickness of the material (+)
The thickness of the formed layer can reach 10-20 cm. Protection is not afraid of mechanical damage, increases the frost resistance of concrete and the durability of the entire structure.
However, the penetrating waterproofing does not provide 100% protection against moisture in constant contact with the liquid. Therefore, it is used as a preliminary treatment before applying the main protective layer.
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Pipe outlet sealing
Application of polymer paste
Surface treatment with waterproofing
Hydrophobic concrete additives
The principle of action of waterproofing additives is the same as that of penetrating compounds. Only in this case, not only the layer near the surface is protected - the entire mass of the material becomes hydrophobic.
Calcium hydroxide, or free lime, in ordinary concrete is washed out over time, leaving a large number of microscopic capillaries and cavities.
The active additives added to the mixture already at the stage of concrete hardening interact with calcium hydroxide and water molecules. Growing in solution, they fill the resulting microcavities and pores.
Cast concrete construction or individual blocks acquire the properties of a stone monolith. With further exposure to water, the surface of the structure becomes even more compacted.
A construction made of such concrete is not only moisture resistant - it is characterized by increased strength, frost and heat resistance, and resistance to the aggressive effects of environmental chemicals.
Additives not only contribute to the filling of micropores - larger cavities are lined with a layer of insoluble crystals. Due to this, the wettability of the surface is minimized, and the effect of capillary retraction is removed.
Due to additives, the surface properties of concrete are changed. Wettability is almost completely eliminated due to the fact that upon solidification it is covered with a layer of insoluble crystals
However, in addition to its positive properties, this characteristic also has a drawback. The formation of a waterproof layer leads to low adhesion with adhesives and plaster. Therefore, before applying the finish coatings, measures are required to increase the surface roughness of the material.
Liquid glass is an effective tool
Water glass is a solution of potassium or sodium silicates. The composition is a transparent liquid mass, which when solidified forms a solid glass-like layer. The principle of operation of such a waterproofing is based on the ability of the solution to harden spontaneously.
Due to its fluid texture, liquid glass fills the pores and cracks of the surface to be protected. Due to this, possible paths for the passage of fluid are completely blocked. The composition makes the treated concrete surface waterproof and increases its strength.
Liquid glass has neither color nor smell. It fills pores and microcracks, forming a transparent moisture-proof layer on the surface
The composition is characterized by good adhesion and is easy to apply - with a roller, brush or spray method. Processing is carried out in two or three layers, waiting for the complete hardening of the applied solution.
It should be borne in mind that liquid glass sets very quickly. Therefore, some skill is needed to carry out the work. This creates difficulties with independent waterproofing of the tank.
The solidified layer is close to glass in its properties - it is hard and quite brittle. For processing surfaces that are constantly in contact with water, it is used only as a basis for gluing with polymer films.
Liquid and viscous waterproofing
Easy to apply and effective liquid products are becoming more common. These are compositions based on bitumen, latex, silicone, polymers. They are applied to the surface with a conventional brush, spray or roller.
The compositions are characterized by good adhesion to the surface - they fill in microroughnesses, pores and cracks, forming a dense moisture-proof membrane.
Viscous waterproofing compounds can be applied without the involvement of specialists - with a brush or spatula. The compositions allow the simultaneous deposition of layers - the adhesion of the material occurs at the molecular level, and as a result a seamless coating is formed
Liquid insulators are divided into two types:
- Water emulsions. Almost no smell, hardening occurs only due to polymerization processes.
- Organic Solvent Compounds. When applied and hardening, toxic substances are released, therefore, they are not recommended for indoor use. After application, the solvent evaporates, an elastic hydrophobic base remains on the surface.
Means most often do not require surface pretreatment. Apply in several layers. The result is a durable and flexible membrane that does not have joints and seams.
Such a waterproof barrier is not afraid of either the water hammer of the water supply system, the fluid pressure, or the shrinkage of the concrete structure and the appearance of small cracks in it. The film will remain intact.
When using colored liquid rubber, the waterproofing layer can also perform the function of a topcoat, saving significant money
The following compositions of liquid and coating waterproofing:
- Bitumen. This is a traditional waterproofing - a viscous organic compound of a deep black color. It is applied in a hot way, which makes the technology fire hazardous. In addition, the coating does not withstand low temperatures and lasts only 6-7 years.
- Bitumen-polymer. The composition does not require heating before application. The addition of polymers makes the composition more elastic and frost-resistant. Adhesion to the treated surface increases. It is used outdoors or in ventilated areas.
- Bitumen-latex, or liquid rubber. Latex is harmless and odorless, so the tool can be used for internal work.
- Water based acrylic solutions. They contain mineral fillers and pigments. They can be white or colored. These are used for a finishing layer that does not require additional staining or lining.
Colored polymer mastics are often used independently, without any topcoat. In this case, in order to increase the wear resistance and coating strength, a reinforcing fiberglass mesh is recessed into the first layer of the applied mass. They are waiting for complete polymerization and coated with a second layer.
Such a protective barrier is able to withstand even severe mechanical stress.
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Waterproofing a small pool
Preparing a pond for protection
Waterproofing pool bowls
The technology of applying the composition
The disadvantage of almost all such compositions is that the ultraviolet has a negative effect on the finished coating, up to the loss of elasticity and cracking. Therefore, outdoor pools are additionally covered with a protective agent.
Polymer coating
Coating a concrete surface with PVC film is one of the most economical ways to waterproof a pool. The film is a finished membrane with a thickness of 1-1.5 mm, supplied in rolls. It is a lightweight, resistant to aggressive chemical attack, completely waterproof material.
Membranes can be smooth - for easy cleaning, and with a rough surface - for covering ladders and the bottom of children's pools. Fiberglass reinforced mesh are more durable and last longer. Unreinforced is cheaper, but their service life is only 5-6 years. After that, the polymer film must be replaced.
Waterproofing concrete with polymer membranes requires a professional approach, and it is quite difficult to do it yourself. Surface pretreatment with penetrating waterproofing or water glass is required.
The film should be laid on a geotextile layer in order to avoid condensation and eliminate friction of the membrane on a rough surface.
In this case, it is necessary to ensure good adhesion of the film to the surface in order to prevent peeling. Welding of seams is carried out by special equipment. The connection must be airtight - the slightest inaccuracy will lead to the penetration of liquid under the waterproofing layer.
Polymer membranes for waterproofing can be either monophonic or imitating tile or mosaic coating. This is an inexpensive way to create an interesting unique design of an artificial reservoir
Internal and external waterproofing of the pool
Measures for moisture protection of the structural elements of the tank should be carried out on both sides at the stage of construction of the pool. Distinguish between internal and external waterproofing of the pool. External waterproofing is arranged to protect the structure from the penetration of groundwater.
Internal - protects the structure from exposure to liquid, which presses on the surface of the bowl with its mass.
The choice of waterproofing methods depends on the installation location of the pool - on the street or indoors, air humidity, height of the aquifer, type of soil.
Groundwater tank protection
Protect the pool from the penetration of groundwater should be at the construction stage - before the construction of the bowl. Under the construction, a sand cushion is arranged on which overlap of the canvas roofing material or other dense waterproof material is laid.
With close groundwater, a waterproofing screen made of clay or loam with a thickness of at least 30 cm will also be required.
The application of a solution of penetrating waterproofing does not require special skills. This can be done with a stiff brush. If the structure is erected from separate blocks, then it is necessary to process the seams with such a composition
To harden the concrete and increase its hydrophobic properties, special additives or water glass are added to the sand-cement mixture. However, this requires strict adherence to the recipes and proportions.
With independent construction of the pool, this is quite difficult. At home, it is easier to process an already finished structure from the outside with liquid glass or penetrating waterproofing.
When installing a pool in a house, penetrating waterproofing will become a protection against water seeping from the pool bowl. In this case, the concrete will begin to harden inward - towards the movement of the liquid, not letting it out and excluding flooding of the space surrounding the pool.
On immovable soils (rocky, semi-rocky rocks, low-moist sand with a low-lying aquifer), penetrating treatment is sufficient.
But clay soils are subject to frost heaving and seasonal shifts. In such areas, microcracks may appear, into which moisture begins to be drawn. A surface coating, especially liquid glass, in this case will not save.
In order for the movement of heaving soils not to affect the technical condition of the structure, they are removed from the pit before the construction of the pool. Free space is filled with river or quarry sand without clay inclusions
Therefore, before constructing a concrete bowl, unstable soils are removed from the foundation pit during frosty periods. Mandatory peeling and extraction of loess loam and sandy loam is mandatory.
Reliable moisture protection is provided by applying a waterproofing coating or liquid rubber. A strong film formed after polymerization withstands aggressive effects and soil pressure and is not damaged by shrinkage of the concrete structure
Processing the exterior walls of the pool with coating waterproofing creates a seamless elastic layer of moisture protection. Moreover, the surface shape can be absolutely any
Waterproofing the inner surface of the bowl
Work to protect the inner surface from exposure to water should be carried out especially carefully. Errors in the waterproofing device lead to leaks and / or wetting of concrete, which you may not even notice. As a result, the material is destroyed, mold appears. Repair work in the end is very expensive.
Therefore, it is better not to save on internal waterproofing. To increase efficiency, several different methods are used at once.
The protective coating of the bowl must meet the following requirements:
- absolute moisture resistance;
- elasticity along with strength;
- ability to withstand hydrostatic and dynamic loads;
- good adhesion to the surface;
- resistance to biological destruction by microorganisms, the aggressive effects of water and the antimicrobial additives contained in it (chlorine-containing preparations);
The material for the internal waterproofing of the pool bowl must be environmentally friendly and resistant to ultraviolet radiation, temperature extremes.
The following types of waterproofing meet these requirements:
- liquid rubber and water-based polymer compositions;
- deep penetration materials;
- protection with polymer membranes.
You can use a combination of three tools at once, or limit yourself to two.
Tile or mosaic finishes look aesthetically pleasing and can turn a simple pool into a work of art. This is a durable coating that can last several decades. To protect the concrete structure from possible penetration of water through the joints, a reliable layer of waterproofing under the cladding is required
Facing the surface of the tank’s bowl with ceramic tiles or mosaics does not lose its relevance. Such a coating is durable - it is resistant to any impact, is well washed and quietly withstands water pressure.
Separate elements are absolutely waterproof. Dangers are seams. Even the use of waterproof grout does not guarantee the penetration of liquids.
Therefore, before facing, the surface must be treated with moisture protective agents. The combination of the penetrating composition with a coating mastic is the most effective waterproofing of the pool bowl, applied under the tile.
For indoor pools, the proper organization of ventilation will play an important role in maintaining normal humidity.
How to waterproof yourself
The simplest and most effective method for independent waterproofing of the pool is the application of penetrating, and then viscous coating formulations. However, in order for the coating to be reliable, technology must be followed.
The ambient temperature during work should not be lower than + 5 ° C. In hot sunny weather, mastic application areas shade or work in the morning and evening.
Mastic must be thoroughly mixed before use. To do this, use a belt mixer to exclude air entrainment in the coating mixture.
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Partially destroyed pool bowl
Repair problem areas in concrete
Primer application on concrete
Abutment processing and reinforcement
Polymer waterproofing treatment
Cement-based mixture application
Painting walls, steps and bottom
Filling the pool with water
Stages of waterproofing work:
- The concrete base is cleaned. Chips, shells and cracks expand and cover. The surface of the walls and the bottom level.
- A layer of penetrating insulation is applied to a well-moistened base. Seams, cracks, places of entry of communications are processed especially carefully. They are waiting for drying.
- The surfaces are degreased with a weak acid solution, which is left for an hour. Then it is washed off with water and the residues are neutralized with a 4-5% solution of soda ash.
- Dry the treated substrate completely.
- Apply the first layer of mastic with a thickness of 2-3 mm. Vertical surfaces are treated with a roller or brush. Horizontal - using the bulk method, followed by distribution with a needle roller, which will help remove air bubbles from the mass.
- Reinforced in a slightly set layer of waterproofing reinforced fiberglass mesh and wait for the complete polymerization (hardening) of the composition.
- A second layer of mastic is applied, the thickness of which can be from 1 to 3 mm.
The waterproofing layer should dry at least 3 days, on surfaces in contact with water - 14-15 days. At this time, you can not step on the treated surfaces and walk on them.
To avoid uneven drying and the formation of a strong and flexible membrane, the coating is periodically moistened with water during polymerisation and covered with a film.
The bitumen-polymer mixture forms a waterproof seamless coating uniformly lining the entire inner surface of the pool bowl. This tank is ready for any type of finish.
According to this technology, it is possible to carry out both internal and external waterproofing of the pool. The surface thus prepared is ready for finishing. You can tile the pool, cover with PVC film, or cover with colored liquid rubber.
How to apply penetrating waterproofing. An example of surface preparation and pool treatment with Vandex materials:
Waterproofing the pool with a polymer membrane:
Moisture protection of the bowl with liquid rubber. Spraying allows you to get a uniform layer of the same thickness:
Whatever the method of waterproofing the pool, the reliability of the coating should be checked for leaks. To do this, fill the tank with water and maintain it for about 10-15 days.
All this time, the area around the pool is periodically checked for leaks. And only in the absence of errors in the waterproofing proceed to the finish.
Have experience in waterproofing a concrete pool? Please share information with our readers, tell us about your method of resolving the issue. You can leave comments in the form below.