No building can do without a solid foundation to support its weight and ensure the integrity of the entire structure, but it also needs additional protection. If necessary, each person can make a concrete blind area around the house with his own hands, without using the services of professional builders. This process is not very complex, but it requires careful implementation of a number of requirements.
Requirements for the blind area, arrangement rules
This structure serves as additional protection for the base of the building, preventing the destructive effects of groundwater and the environment. In addition to protection, it also performs an aesthetic function - a building with a blind area acquires a complete appearance. Before making concreting of the blind area with your own hands, you need to familiarize yourself with a number of requirements:
For the successful creation of a blind area, a drawing should be drawn up. It can be compiled independently, guided by standard projects, or contact specialists. If necessary, it can be limited with. As a decorative element, it also increases the integrity of the structure and protects against the penetration of the roots of trees or shrubs.
Borders are a must if you create a blind area around the house from dropout or rubble, and in the case of poplar, sycamore, raspberry and blackberry growing nearby.
DIY materials for creating a concrete blind area around the house
Before starting work, you need to prepare all the necessary materials and a diagram. The foundation should be strengthened consistently, but the whole process should take a minimum of time. In most cases, when drawing up a project, you can use typical concrete blind areas, making adjustments to the scheme in accordance with the characteristics of your region. You will need the following materials:
- Concrete. The resulting mixture must meet the characteristics of the class from B3.5 to B8. When creating it, cement of the M 400 brand will be the best.
- Sand. River or quarry sand can be used as a pillow. The material used when mixing the mixture must be soft, the presence of large impurities is not allowed.
- Crushed stone or gravel. Fraction of crushed stone for the blind area of the house - 10-20. It is used as a filler for concrete mix, or as a base material.
- Clay or geotextile. This material is used when arranging a concrete blind area with your own hands for additional protection from moisture, which is important for regions with high humidity.
It is determined by the brand of cement used and its specific gravity as a percentage of the elements of the solution. A good solution would be the M400 Portland cement material. Used cement must be fresh. If the powder forms lumps when squeezed in the hand, it will soon become unusable. The brand of the selected cement depends on the planned thickness of the concrete blind area. Recommended proportions for mixing 1 m 3 of solution:
- water - 190 l;
- filler (screening or crushed stone) - 0.8 m 3;
- sand - 0.5 m 3
- plasticizers (liquid glass and the like) - 2.4 liters;
- cement - 320 kg.
When calculating the size of the blind area around the house, you should prepare the required amount of building materials in advance. It is also important to follow the order of supply of materials, which is necessary to ensure the required consistency. Compliance with the technology will allow you to achieve the desired result and create a reliable design. If you fulfill all the requirements, you can effectively equip a concrete blind area around the house with your own hands.
The amount of water supplied is of great importance. Excess will reduce the strength of the resulting concrete. Lack of water will prevent it from hardening properly.
How to make a blind area for the foundation with your own hands - step by step instructions
The required amount of cement is poured into a concrete mixer or other mixing container, and then it is filled with water. With stirring, a "cement milk" is formed, into which other components are fed. Next, sand is added in small portions, while the mixture must be constantly mixed. Next, the filler is poured (crushed stone or screening). If you found out in advance which crushed stone is better for the blind area, and selected the material of the correct fraction, mixing will not be difficult.
For more effective mixing, wait 5 minutes after adding each component.
As soon as the materials are prepared, you can start working. The device of a blind area around the house includes the following stages:
Also, before pouring, an expansion joint is installed between the blind area and the basement using boards or plywood sheets - this measure will protect the concrete from destruction when the temperature changes.
Installation of a crushed stone blind area
A more economical option would be to use crushed stone as the main filling material. The same requirements are imposed on its arrangement as for the concrete blind area, however, reinforcement and the creation of an expansion joint are not required here. An additional layer of waterproofing (geotextile) is installed between the crushed stone and the sandy "cushion". This will prevent the mixing of rubble and sand, and will not allow plants to grow from seeds that may have remained in the "pillow".
A crushed stone blind area can be made with your own hands without much effort. Coarse material can be used to fill the bottom of the trench. From above, to give a decorative effect, fine gravel is used. Such a blind area also successfully protects the foundation from the destructive effects of groundwater and the environment. With the right approach, you can give it a neat and attractive look.
Do-it-yourself concrete blind area from A to Z - video
27.03.2016 0 comments
During operation, the blind area of the house performs several functions - it is the protection of the foundation from external influences, and reduces the wear of the main structure. Do-it-yourself blind area around the house is not as difficult as it might seem. It must be done at the last stages of construction, this will preserve the structural integrity of the foundation after the construction work is completed.
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Features of technology and functional tasks of the blind area
A properly organized blind area will be a durable structure, and the installation process will not be too complicated and time-consuming. When all the nuances have been studied, it is very simple to correctly make a blind area around the house - it does not take much time, you can save on construction work. For a residential building, it is necessary for the following reasons:
- Reliable protection of the foundation from precipitation (rain, snow) and other external climatic influences.
- Water disposal through a drainage system. In the blind area, drainage gutters are organized, with the help of which reliable protection of the foundation and basement from moisture is ensured.
- Improved thermal insulation performance. If all layers are arranged correctly, if materials intended for thermal insulation are used, not only the basement will become warmer - it is possible to reduce the degree of soil freezing near the house.
- Aesthetics - have excellent decorative properties. The exterior of the building will be completed architecturally.
- It is possible for the blind area to perform practical functions - it will be used as a small path that surrounds the house around the entire perimeter. If there are plantations next to the building, such a structure will allow you to move around the house without harming the plants.
What could be the design?
The process of building a blind area around the house begins with determining its structure, specific parameters, as well as external cladding. Most often it is made from the following materials:
- crushed stone;
- monolithic reinforced concrete structure;
- natural stone, paving stones, paving slabs.
How to make a blind area with your own hands if the foundation is columnar or floating? For them, the use of a combined drainage system is allowed. Whatever the materials and design of the blind area, it will be multi-layer, and a long service life can only be ensured if the relevant construction standards are observed. In most cases, the design will consist of the following parts:
- base (bottom layer used as bedding for the rest);
- materials with good waterproofing properties to protect against moisture;
- a layer with drainage structures for drainage;
- two outer layers, the first of which is protective and the second decorative.
Preparation for construction
When a blind area is being erected with your own hands, step-by-step instructions will help you carry out all the stages of construction correctly. The first stage is preparatory, when all design parameters are determined, including material and dimensions. The main indicator is the bandwidth - according to the recommendations, it should be at least 60 centimeters. Before the final choice of the project, it is necessary to take into account a number of factors that can affect its overall dimensions:
- Features of the roof, cornices, removal range. Make the blind area 20-30 centimeters longer than the roof removal.
- Architectural and design features of the building. If the house structure contains architectural elements with a broken or rounded shape, the execution of the blind area can be made appropriate by organizing a bundle with other buildings and design elements of the adjacent area.
- The type of soil at the site of the construction of the blind area. If the soil is characterized by a significant degree of subsidence, the optimal width is at least 90 centimeters or even 1 meter. More than a meter wide - high drainage efficiency and the ability to use it as a circular path.
The main condition is that the arrangement of the blind area should be such that the foundation of the house and the basement receive reliable protection from moisture (continuous structure).
Determination of the slope
A high-quality and reliable design is obtained while observing the requirements for the slope, as this will ensure reliable water drainage. The slope of the blind area of the house to the ground, according to the recommendations, is from 1.5 to 5 degrees... The exact value is determined based on the characteristics of the climate in the region and the decorative coating used. If the main material is crushed stone, the structure will require a greater slope of the blind area than when using paving stones or paving slabs. You can form the corner initially (by placing the base with a slope), or already when working with a decorative coating - the last outer layer.
Construction Materials
When all the features of the project are determined, you can begin to calculate the amount of building materials, as well as select the appropriate tool and other construction equipment. In all cases, sand and gravel should be present in the litter layer. For certain types of soil, it is recommended to use clay in the litter, which at the same time acts as a waterproofing agent. Most often, the blind area is made in the form of a one-piece monolithic structure of concrete; for effective preparation of the solution, one cannot do without a concrete mixer, containers for it, as well as reinforcing metal reinforcement.
Concrete preparation
To make the blind area strong and reliable, it is necessary to use concrete grades M250 - M350, but sometimes a higher class is chosen. The classic composition for filling the blind area is 8.5 parts, of which 3 is sand, 4 is crushed stone, 1 is cement and 0.5 is water. Cement and water are mixed in a concrete mixer until a homogeneous mixture is obtained - a connector for crushed stone and sand. The remaining components of the mixture are poured into the concrete mixer in portions, the materials in this case are distributed evenly.
It is required to control the moisture content so that the mixture does not turn out too liquid. The water should saturate the cement well, but it is poured in exactly as much as is needed for soaking. The larger the crushed stone, the lower the ratio of the amount of water and other components (the optimal fractions of crushed stone are from 0.5 to 2 centimeters). The sand is sieved and washed before being added to the solution to eliminate impurities.
Step-by-step instructions for the construction of a concrete blind area
The monolithic structure is reliable and durable, well protects the main structures of the house from the destructive effects of moisture. It is not difficult to make such a blind area with your own hands, and therefore it is considered the most common. The sequence of actions is as follows:
Final stages of work
The laying of all inner layers is completed with the drying of the concrete mortar. To make the blind area of high quality, it is necessary to ensure a uniform drying rate of the solution without additional funds. Drying too quickly can lead to cracking, which will disrupt the waterproofing properties of the blind area, making them less quality and durable.
To prevent the concrete from drying out quickly, cover it with a film or wet cloth. The structure will be fully ready for use only after 15-20 days, and it is then that you need to start finishing. The most common materials for decorating blind areas are ceramic tiles and porcelain stoneware. You can use special compounds that will combine protective and decorative properties.
The arrangement of the blind area is not one of the types of work that can only be trusted by professionals. Do-it-yourself blind area according to the step-by-step instructions given above is done quickly and without additional costs. The final cost will include only the price of materials and tools.
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What is the blind area around the house for? Can I make it with my own hands? The blind area, first of all, serves as a kind of protection along with a decorative function. It is installed after the end of the layout of the walls, when the time comes for exterior decoration. It protects the foundation from atmospheric precipitation or its consequences. The blind area looks like a wide strip, hermetically adjacent to the outer part of the foundation, enveloping the house from all sides. It is this adjoining area that is exposed to the greatest amount of precipitation that flows from the roof or walls of the building, so it must be reliable, waterproof, strong.
In addition to its direct purpose, the blind area "works" as a heater for the basement of the building.
As for the width of this guard band, the rule “the more, the better” works. According to SNiP, the minimum width of the blind area should be at least 80 cm, while the maximum can be any - at the discretion of the owner of the house.
There are certain requirements for arranging this architectural element:
- The width of the strip should not be equal to the level of the roof overhang, and it cannot be narrower than its edge.
- The blind area around the house should run continuously.
- The protection of the building foundation depends on the strip width.
- Installation is carried out with a slope from the house of at least 1.5 °.
It should be wide enough so that it can be walked on unhindered without hitting walls. The most optimal width is 1 meter.
Blind area around the house
A blind area of any type consists of two layers - an underlying and a waterproof one. The bottom layer is usually gravel, crushed stone or sand, while the top layer can be made of concrete, natural stone, paving slabs, asphalt.
The optimal angle of inclination from the house is 3-5 °, if the building is on ordinary ground, then the width of the blind area should be about 20-30 cm larger than the cornice. If your dwelling is built on subsiding or swampy soil, then the width should be at least 90-110 cm.
It is worth mentioning that some types of foundations (for example, screw and pile) do not need a blind area at all. They require the installation of a protective coating only in places where water is drained from the roof.
If the house is on heaving soil, then it is better to make a blind area with insulation - this is necessary so that the protection does not allow moisture to pass through. In winter, the water freezes, expands the soil, therefore expanded polystyrene laid in the blind area is able to prevent this factor. Extruded polystyrene foam not only does not allow water to pass through, but is also characterized by high thermal insulation qualities.
Expanded polystyrene is placed between the layers of the blind area (a crushed stone or gravel pad is located below), it is best to pour concrete on top or lay tiles, cobblestones. This method of insulation is very effective and shows good results.
Consider the types of blind area around the house:
- The simplest, but already practically not used material for the device of the protective strip is clay. It is an excellent hydraulic lock for the foundation of a house. Now the use of clay is no longer relevant, since new modern materials confidently occupy a leading position in the construction market.
- Concrete protective strip is the most common option for arranging foundation protection. It is quickly installed, has a low cost for the price of building materials spent, has a long service life, and is resistant to the manifestations of natural factors.
- A blind area of tiles around the house is laid on a layer of sand. The tile is convenient because it can be matched to the appearance of the building or the decorative features of the suburban area. This type of protective strip around the house is durable and easy to install.
- Natural stone, laid around the house, looks very beautiful, has a long service life, but requires patience and accuracy when laying.
- The asphalt coating of the protective strip is rarely used, due to the lack of decorative effect, specific smell when heated by the sun's rays and high cost.
- A waterproof protective strip is made only if there is a well-installed drainage system. In this case, much attention is paid to the installation of gutters from the roof so that moisture is removed at a considerable distance from the foundation of the building. Such protection around the house works more for decorativeness than for practicality.
- One of the most expensive types of blind area is made of granite. Respectable appearance, quality, durability are the main criteria for this method of protection.
It will be ideal if a drainage system is installed on the outside of the entire perimeter of the protective strip around the house (it does not have to be made very deep). This technique will maximally protect the foundation from contact with moisture.
How to make a blind area with your own hands around the house?
As mentioned above, the blind area consists of two structural layers - underlying and covering. The underlayment provides an even, solid base for laying subsequent materials. Sand, clay, fine crushed stone act as a "bedding". The thickness of the bedding layer depends on what material the protective strip will be covered with.
The coating fulfills its main purpose - protection from water and no matter what material it is made of.
As an example, consider the phased construction of a concrete blind area:
- Initially, the marking of the future protective strip is carried out; for its arrangement, we will take as a basis a width of 1 meter.
- Around the entire perimeter of the house (in accordance with the markings), remove the soil layer (20-30 cm) and compact the base.
- If there are plants under the layer of removed soil, then their roots can be treated with herbicides so that later they do not begin to punch their way through the coating.
- We make removable formwork from the boards.
- We put a thin layer of clay on the compacted soil, and on top of it there is a sandy layer (about 10 cm). Clay, sand should be well compacted after laying. In the immediate vicinity of the foundation, sand is rammed especially carefully.
- We spill the sand layer with water, but not very abundantly, since there is clay below.
- We lay crushed stone in a thin layer, about 6-8 cm.
- In order for the future protective strip around the house to be strong, to withstand compressive and tensile loads, it needs to be reinforced. For this purpose, a reinforcing mesh with a step of 10 cm is suitable.
- In the place where the blind area is adjacent to the plinth, an expansion joint must be made, sometimes it is called a temperature or expansion joint. This seam performs a kind of protection against soil subsidence. It has a width of 1-2 cm. Thus, this gap between the basement and the blind area is filled with a sand-gravel mixture or roofing material, it can also be filled with resin or foamed polyethylene (bundle), sealant. It is obligatory to install expansion joints in all corners of the house.
- How to fill the blind area at home? The construction of expansion joints is essential when arranging the correct protective strip around the house. When pouring with concrete, every 2 or 3 meters, thin wooden boards should be installed, placed on the edge. For these purposes, ordinary wooden slats are optimal, they must be laid so that the upper surface coincides with the level of the surface of the concrete mass and always taking into account the slope! Wooden elements can be pre-treated with anti-rotting agents.
- What kind of concrete is needed for the blind area around the house? The concrete that is used to create it, in terms of frost-resistant characteristics, should not be inferior to the road analogue. The M250 or M300 brand is perfect, it is mixed with sand, fine gravel, water until a homogeneous mass is obtained. This mass is laid on top of the reinforcement mesh and wooden ribs, compacted (by vibration or bayonet) and leveled using a rule.
- A self-made concrete blind area around the house will become as strong as possible if you use the ironing method immediately after pouring. This construction technique has two methods - dry and wet. With the dry method, cement is poured onto the freshly leveled concrete layer. It is sieved on a fine sieve. By tapping on this sieve, it is evenly distributed in a thin layer (2-3 mm) over the entire surface of the protective layer. After the performed manipulations, this layer is carefully compacted with a plastering trowel. Dry cement draws moisture out of the raw concrete and hardens to form additional reinforcing armor. With the wet method of ironing, the sifted cement is mixed with water to a pasty consistency, applied to the dried concrete layer using a plaster spatula. The thickness of such protection is 2-3 mm. Sometimes ceresite or liquid glass is added to such a solution, but in any case, the strength of the protective layer depends on the quality of the compaction and smoothing.
- At the final stage, the concrete is covered with a wet cloth and periodically moistened. This protects the concrete layer from drying out until the moment when it finally hardens. After 7-10 days, your concrete area will be ready.
You can go the easier way - to save time. This method is now very popular, as it has good protective qualities, it gives the house strip an attractive look.
To do this, after removing the soil layer, sand is poured onto the bottom of the trench, poured from above with liquid glass mixed with a hardener. After hardening, an attractive monolithic surface is obtained, which has high moisture-resistant characteristics.
How to repair a crack in a blind area at home?
Cracks or damage on the concrete surface can also appear due to certain circumstances. Shallow cracks can be filled with a slurry of cement, larger ones are pre-cut out for the entire length of the damage, cleaned of debris and dust. After cleaning, the crack is filled with a mixture of bitumen, asbestos and sand.
Large damages can also be filled with fresh concrete mass, having previously primed them. Further, the "patch" is looked after in the same way as for a regular screed - the surface is moistened until the concrete is completely hardened.
If the damage is serious, then additional reinforcement of the cracks is made, followed by their filling with a sand-cement mixture with the addition of crushed stone. After complete hardening, the patches are treated with a primer.
Soft blind area around the house
The soft blind area does not have a hard top coating; instead, crushed stone of various colors is poured or soil with grass is generally used. A soft blind area is not afraid of soil deformations due to freezing and subsequent thawing. When installing such a protective strip, it is not necessary to observe the slope angle. If a layer of expanded polystyrene is provided at the base of the soft coating, then it will additionally help to reduce the depth of soil freezing in the area of the foundation.
A blind area around the house made of rubble is done like this:
- A layer of soil is removed, compacted, then a layer of clay (10 cm) is laid over the entire area of the resulting trench. To avoid subsequent swelling, the clay must be absolutely clean, that is, free of sand.
- Clay is also rammed, a waterproofing film is laid on top of it (with a margin). If circumstances develop in such a way that the blind area moves away from the foundation, then the supply of film will be able to compensate for the shortage of material that has arisen. The film is fixed by overlapping directly onto the foundation.
- Sand is poured over the water protection.
- The next stage is the laying of geotextiles over the entire area of the future blind area.
- Crushed stone is poured onto geotextiles. The embankment layer can be from 10 to 15 cm.
- Geotextiles are re-laid, on which decorative crushed stone is poured.
Thus, any blind area around the house, made with your own hands, will help to significantly increase the operational resource of your home, bring additional aesthetics and attractiveness.
The blind area with your own hands can be easily equipped. It is designed to protect the foundation from precipitation under its foundation, as well as water that forms after the snow melts. In some regions, it is required in order to exclude the interaction of materials with high-lying groundwater. If there is a desire to extend the life of the building, then it is important to provide the building with the mentioned element.
Features of the blind area
Do-it-yourself blind area can be made of wood, concrete, brick, asphalt, tiles, reinforced concrete slabs or cobblestones. Whichever design is chosen, it will have two layers, the first of which is a coating, while the second is a special lining layer made of fine gravel, sand, clay or prancing. It is recommended to build this part of the house together with the foundation. However, if the building was purchased, but it turned out to be deprived of a blind area, it can be completed. If a blind area is to be built with your own hands, the instructions will definitely come in handy. The main rule in this case is that it should be 25 cm larger than the overhang of the cornice. Ultimately, you should equip an element with a width of 100 cm.The wider this component is, the better it will drain water. The standard slope is 3 to 7 degrees. In parallel, a storm outlet is being built, which is a groove located along the perimeter.
Determination of the boundary and preparation of the base
If you build a blind area with your own hands, then first you need to determine the border. It is recommended to remove the plant roots under the future structure before this; this can be done with a bayonet shovel. She needs to remove the top layer of soil so that the plants cannot destroy the blind area. The soil can be additionally treated with a herbicide. It is necessary to install boundary boards around the perimeter to prevent the solution from leaking out. Now the prepared place must be covered with sand, tamped well and filled with water. The next layer will be broken bricks or rubble. All this needs to be compacted using a vibrating unit.
Heat and waterproofing
If you build a blind area with your own hands near a house that has a basement or cellar, then it is necessary to make insulation. In the role of materials for this, it is recommended to use penoplex, expanded polystyrene or foam glass. It is necessary to carry out work in such a way that an air layer remains under the blind area, its thickness should be 15 cm. Roofing material or PVC film can be used as waterproofing.
Providing temperature dissipation
When building a blind area at home with your own hands, it is imperative to install incisions; for this, storm trays or flat slate are perfect. Another important point is the need to leave expansion joints in the area where the walls join the blind area. To do this, you can use a sealant, bitumen or roofing material. The second option should be laid in two layers.
Working with concrete
At the next stage, you can prepare and pour the solution, it is preferable to use the M300 brand, which will make it possible to obtain a strong and reliable blind area. Concrete can be made by yourself, for this you should use sand, cement, crushed stone and water in a ratio of 3: 1: 4: 1/2. In a concrete mixer, it is necessary to mix the cement with water, this should be done until a glue-like mixture is formed. Next, add crushed stone and sand. The concrete can be considered ready when the mass becomes homogeneous.
Ironing
If you are thinking about how to make a blind area at home with your own hands, then it is important to make iron. To do this, 15 minutes after pouring the concrete, it is necessary to sprinkle the surface with a dry cement mortar, which is smoothed with a spatula. This will eliminate the possibility of moisture penetration inside. In this case, the surface itself will be smooth and aesthetic in appearance. However, if after it is supposed to lay the tiles, then this step must be skipped.
The choice of the design of the blind area
You can make a blind area with your own hands in a short time using ready-made concrete slabs. They will need to be laid on a previously prepared surface, and then filled with liquid bitumen. Drainage profiled membranes, which are laid on the ground under a layer of sand, have recently become more and more popular among consumers. Any covering can be laid on top.
Features of the concrete blind area
Despite the emergence of more and more options for the described design, consumers most often choose concrete options. Such systems are located on clay, which is 15 cm thick. If you have to work with heaving soil, then you can use an additional layer of sand, its thickness should be equal to 8 centimeters. If you use only concrete for work, then the slab will quickly collapse. In this case, it is necessary to make expansion joints, they are located every three meters. For this you need to use wooden slats, which are pre-coated with bitumen. They need to be installed on the edge, concrete is placed between them. Another option for organizing the seams is to use a reinforcing mesh, which is laid with a large overlap. If the blind area of the house is equipped with their own hands, then when it is erected, it is possible to exclude the possibility of water absorption by the method of filling in cement. In the next step, the surface is covered with a wet cloth and everything is left in this state for 10 days. Periodically, the system needs to be watered with water. If you still cannot decide which type of blind area to use, then the use of concrete is not considered the best option. This is due to the fact that this material is consumed when carrying out such work in a very impressive amount. Moreover, the process will be very time consuming. The only plus is that it will be possible to walk on the surface of the structure.
Soft blind area
If you are building a blind area with your own hands, the step-by-step instructions presented in the article will eliminate many mistakes. The concrete variety is only suitable for non-porous soils. For troubled soils, it is preferable to use a soft blind area. To do this, you need to lay clay around the foundation under some slope. Waterproofing is laid on top, which can be a film or glass insulation. The density of the former should be approximately 250-300 microns. The waterproofing must again be backfilled with clay, providing a layer of 1-10 cm. Fine gravel is indicated directly along them.
Blind area rubemastom
If you will fit the blind area around the house with your own hands, then you can use a rubemast. To begin with, formwork is installed, for which an edged board should be used. The space inside is covered with sand. The trench should initially be tamped horizontally, while the sand is laid with some slope. It will need to be closed with a rubemast, bending the excess onto the wall surface. A kind of trough needs to be filled with ASG to the upper edge of the formwork. Next, the paving stones are mounted, which provides the ability to move on the surface.
Use of geotextiles
Do-it-yourself blind area, the step-by-step instructions of which are presented in the article, can be equipped with geotextiles, which are used to exclude weeds. To begin with, you should carry out the markup, as well as dig a trench at the required slope. Further, geotextiles are covered, the plus of which is that it allows water to pass through, but does not allow weeds to germinate. It can be used for 20 years. It is necessary to roll out the material with some overlap on the foundation. The first layer of crushed stone should be backfilled using a fraction of 10 to 20. It is laid on geotextiles, the surface must be leveled with a rake. Next, a curb is prepared, the height of which is 20 cm. It must be laid on a sand cushion, for this, river sand should be poured on the edge of the blind area. The inside of the trench should be covered with rubble, the layer of which is 10 centimeters.
Finnish blind area
Before making a blind area around the house with your own hands, you need to think about what technology will be used for this. Experts recommend using a drain pipe during work. Along the perimeter of the foundation, this element must be laid, and then covered with gravel. It is important to provide the pipe with holes. Styrofoam is laid on top, it is important to provide an overlap, after which everything must be covered with soil. The pipe should be connected to drainage wells. At a distance of 40 cm from the foundation, you need to pour crushed stone, and on top of a beautiful pebble. Before making a blind area around the house with your own hands, it is important to think about its practicality. Such a system will effectively drain water, and the foundation will not freeze, while cracks will not form on the system itself.
