Is it necessary and how to properly insulate + Video

Is it necessary and how to properly insulate + Video Insulated blind area: is it necessary and how to insulate it correctly. The blind area is a kind of protective strip around the base, that is, the foundation of the house. It is needed to protect the base from destruction by moisture and does not allow water to wash out the ground from under the base. In terms of functionality, an insulated blind area would be the best option, since it will also protect the base of the house from freezing.

Before you start to carry out the insulation work of the blind area, you should correctly determine the dimensions.

Building around the house that is narrow will not work. In addition to insulating the blind area, it must perform another function - to drain water from the base of the house. Based on this, the width should be determined by the protrusion of the roof behind the wall of the building. The blind area must be 20 cm wider than the ledge. If desired, the width can be larger, but this is the aesthetic side, which depends entirely on the wishes of the owner.

Features of manufacturing and types of insulated structures

Variants of creation

A rigid blind area made with your own hands will definitely need to be reinforced. Only then will it acquire resistance to ground vibrations. Pouring concrete will need to be done with your own hands just once and around the house to get a monolithic structure. When interruptions are formed, especially at the corners of the structure, the risk of voids formation increases. In addition, they will create cold bridges, and water will accumulate inside the voids.

In severe frost, the water will freeze, and this will become a direct threat of rupture of the concrete screed.

The easiest way would be to make a soft blind area that looks like a layer cake from various building materials. As a heater, you can cover it with expanded clay or cover it with extruded polystyrene foam. When creating a foundation, a soft blind area will be an ideal option for choosing a site with moving soil areas. When vibrating, soft layers will not crack like a concrete screed.

In addition, making it with your own hands is many times easier, since no heavy concreting work is required.

If you want the blind area not only to drain water from the foundation, but also to serve as an additional insulation, it will be more effective to jointly insulate the blind area around the house and the basement. This is especially true if you have a basement or basement.

What and how to insulate?

In the modern construction market there are many different materials for thermal insulation. But in order for the insulation to be effective, should choose the right material:

  • The simplest construction of a soft blind area must necessarily be insulated with expanded clay .

    This material can withstand heavy loads, is moisture resistant and is fireproof. Of course, you can insulate with expanded clay and a rigid blind area, and even add it to the concrete mix when pouring around the foundation.

  • You can insulate any blind area using extruded expanded polystyrene . Plates will perfectly withstand the load, have a low level of moisture permeability, and you shouldn't worry about fire safety either - being in the blind area, the material is not afraid of fire.
  • No less effective polyurethane foam , with which you can simultaneously insulate the blind area and the foundation.

    The spray foam fills all voids and forms a solid coating once it cures. But there is also a drawback - the high cost and the need to use special equipment for spraying, and this excludes the possibility of doing it yourself.

  • Insulation for the foundation wall can be done by using foam or foam . These heaters are almost the same, slightly different in characteristics. But using them for a pie in the blind area is completely undesirable, since these materials, in comparison with expanded polystyrene, tolerate the presence of moisture and load much worse.

    By the way, the base can be insulated with the same extruded polystyrene foam.

If at the very beginning you choose the right type of insulation for the foundation of the house, that in turn will be completely protected from freezing.

Creating a blind area

When you figured out the best way to insulate the blind area, you should find out what it consists of and how to make it yourself. To begin with, let's look at what the general scheme for creating a soft and hard blind area looks like, and then consider the installation of all types of insulation.

Step-by-step instructions are as follows:

  1. You need to drive pegs around the house and pull a string between them so that you can mark the space for the blind area.

    A trench should be dug along the cord. We have already spoken about the width above, but the depth will directly depend on the type of soil. If the soil is clay, 45 cm depth is enough. On loose soil, the depth should be 60 cm so that the clay castle can be laid.

  2. After that, the formwork must be installed around the trench and the layers can be laid.

    If you need to make a clay castle, make it the first layer. We pour clay 10-25 cm thick, this is selected individually according to the condition of the soil. The layer needs to be leveled, tamped tightly, and done so. To get a slight slope from the foundation.

  3. The next layer is sand, its thickness should be from 5 to 10 cm.

  4. Lay a waterproofing film on the sand, and it should be wrapped on a plinth.
  5. Now you need to lay the insulation with your own hands. We put the selected material for insulation on top of the waterproofing. If you want to insulate the basement as well, then do it together with the waterproofing insulation.
  6. There should be another layer of waterproofing on top of the insulation, and then backfill everything with a layer of sand of the same thickness as the first time.

  7. Now place a geotextile cloth on the sand, which will prevent the two layers from mixing, and if you are making a soft insulated blind area, it will act as a water filter. Pour 10 cm of medium-sized crushed stone onto the geotextile.
  8. If you are making a soft blind area, sprinkle 5 cm of sand on top of the crushed stone and paving stones or ordinary decorative stone on top.
  9. To make a concrete blind area with your own hands, lay a reinforcing mesh on the crushed stone, in which cells with a size of 10 * 10 cm every 3 to 6 meters, and also install boards with an edge on the folds and corners. They are required in order to create expansion joints that will protect the screed from cracking.

    In addition, the correctly selected height of the boards will also become a good beacon when pouring the screed.

  10. Pour concrete in one day. When the screed begins to harden, but is a little damp, rub in dry cement over it and cover with plastic wrap. These actions will give the concrete strength and reduce the level of water permeability.
  11. Finish on top of fully cured screed.

    It can be asphalt, paving slabs, stone or any other material of your choice.

So, we looked at the general scheme for creating a screed pie. Now let's find out what is included in the step-by-step instructions for installing each of the proposed types of thermal insulation.

By the way, for the correct preparation of concrete for the screed, you can find the required proportions in the plate.

Brand Mass composition, C * P * U (kg) Composition by volume per 10 liters of cement, P * W (l) Amount of concrete per 10 liters of cement, (l)
M100 1 * 4.

65 * 7

42 * 62 79
M150 1 * 3.55 * 5.75 33 * 51 65
M200 1 * 2.85 * 4.85 24 * 41 55
M250 1 * 2.

15 * 3.95

20 * 35 44
M300 1 * 1.95 * 3.75 18 * 33 42
M400 1 * 1.25 * 2.


12 * 25 32
M450 1 * 1.15 * 2.55 11 * 23 30

Insulation of the blind area

Now let's talk about how to properly insulate the blind area at home. Laying insulation inside is easy, but take it seriously. In most cases, this is what insulation was started for.

Although, if we are talking about the complexity of the work, then with expanded clay or expanded polystyrene, you can insulate the blind area with your own hands, and to spray polyurethane, you will need to contact a specialist.

Extruded polystyrene foam

Insulation with such material as expanded polystyrene is done using sheets of material with a thickness of 10 cm in one layer. If you are using sheets with a thickness of 5 cm, you should do the laying in two layers. In this case, the plates of the upper row must necessarily overlap the joints on the lower row.Hammer in all the gaps with pieces of insulation or blow out with polyurethane foam.

The installed thermal insulation around the house must necessarily look like a monolithic structure.

The most important condition is that it is necessary to separate the expanded polystyrene with waterproofing from the rest of the blind area, namely to lay it both under the sheets and on them. This is due to the fact that the insulation itself is not afraid of moisture, but if water gets under it and freezes, the plates will be deformed.

In this case, the installation scheme is slightly different:

  • In a soft blind area, the slabs should be laid between two layers of sand, which will protect the slabs and waterproofing from damage due to rubble.
  • Thermal insulation of a rigid type of blind area must be performed in two ways, which differ by pouring concrete.

    In the first version, the insulation is placed between two layers of sand, and sprinkled with crushed stone on top, a reinforcing mesh and a concrete screed are laid. In the second method, the concrete screed can be poured directly onto the insulation. It will also need to be covered with waterproofing, and from above, perpendicular to the foundation, place reinforcement rods with a step of 60 cm. A reinforcing mesh is laid on top of them and poured with concrete solution.

Some owners of private houses make insulation using polystyrene foam, and do not pay attention to the fact that it has worse characteristics than expanded polystyrene.

In this case, the step-by-step instructions remain unchanged, since the plates are made of the same material. But the fact is that a blind area with polystyrene foam or polystyrene will last several times less than with expanded polystyrene.

Polyurethane foam

This is the most effective, but expensive insulation of the blind area. It is applied under high pressure, and therefore a layer of crushed stone should be laid on the sand before spraying, otherwise the sand will simply blow off. The foam should be applied to crushed stone with a thickness of 7 cm.

After 1/4 hour, it will harden completely and will be ready for you to lay the reinforcing mesh with further pouring of the concrete screed. The term of use of polyurethane foam is about 40 years, but this material gives a 100% guarantee and effect with joint insulation of the foundation and blind area.

Expanded clay

The easiest way to insulate the foundation area is to use expanded clay. The pie scheme is as follows:

  1. Is it necessary and how to properly insulate + Video At the bottom of the trench, equip a clay castle, which will be covered with a layer of waterproofing material ..


  2. After that, pour a layer of sand, which will be covered with dronite. Such material will protect the structure from subsidence in the future.
  3. Cover the material with a layer of expanded clay, then cover it again with a layer of dronite, and pour sand on top of it.

So we got the simplest expanded clay insulation that can be done by hand.

Pour decorative rubble on top of the sand around the house or make any other covering of your choice.

Thermal insulation of the basement

Warming of the foundation will take place at the stage of laying the thermal insulation in the blind area. The best way to insulate yourself is to use sprayed polyurethane. It was considered above, and therefore you can immediately go to the standard line of materials. You can finish the plinth with polystyrene foam, polystyrene foam or polystyrene foam.

In any case, the installation process is simple. The only caveat is that the option with expanded polystyrene provides for laying waterproofing between it and the wall. In the center and in the corners, for reliability, the plates should be fixed with plastic umbrella dowels. After that, you can start finishing work. Usually.

A grid is glued to the plates, a layer of primer is applied and covered with decorative plaster.

This is, perhaps, all about how to independently insulate the blind area and foundation.

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