The most effective insulation of the basement - outside or inside?

The most effective insulation of the basement

As the saying goes: "The owner - a gentleman." That is why everyone decides for himself how to build, when, out of nothing. But if you deal with such matters can be yourself, in order to answer such questions: "Do I have to do the insulation of the walls and the foundation, and if necessary foundation insulation outside, whether to do the same inside?"- Need expert opinion, because only a trained eye can determine the extent of the pro" usefulness "in a particular case. And let's find out how best to insulate the foundation - from the outside or the inside?


  • Expert opinion on options for basement insulation
  • How and what to insulate the foundation from the inside
  • Materials and methods of insulation from the outside of the foundation
    • Operational method - polystyrene foam insulation
    • Provide thermal insulation using expanded clay

Expert opinion on options for basement insulation

The majority of builders agree that the best way to insulate the foundation outside. Not to be unfounded, they result in fairly strong arguments in favor of this method.

  1. Regardless of the type of insulation used and the type of foundation, external thermal insulation to protect the foundation from frost, preventing the penetration of the low temperatures inside the buildings.
  2. Outside insulation has a positive effect on the quality of the concrete, and basement construction in fact, saving their strength for years to come.
  3. Also, the outer insulation is an additional barrier to groundwater, helping to protect the waterproofing of the foundation from moisture.
  4. Apart from the lower part of the foundation of the outer insulation resists temperature changes that occur in the upper basement of the house with the changing seasons.

But there are times when the insulation of the foundationthe outside is not possible, then certainly no dilemma before the owner is not necessary and there is only one - to insulate the inside. In fact, the benefits are not so much, and to be honest, only three:

  1. Insulation of the basement inside a positive effect on the microclimate of the cellar and the whole house.
  2. Internal insulation protects the foundation from groundwater.
  3. Internal insulation prevents condensation build up in the basement.

In principle, there are positive aspects, but there are also negative:

  1. Yet outside the foundation freezes.
  2. Due to the changes in temperature and frost heave occurs foundation deformation and cracks around its perimeter.

What good is that the foundation you built so carefully, will begin to crumble and fall apart in a few years?

How and what to insulate the foundation from the inside

So, you decide to carry out insulationinside the basement, apparently it you had a good reason. For insulation the inner surface of the basement from the basement or sub-floor is best used penopolituretan, since it is much easier to work in confined spaces, and time for similar work will take much less.

The process of insulation is very simple - you need tospray polyurethane over the entire inner surface of the base, wherein the hooking part of the basement walls. For greater certainty, you can in the same way to warm the floor and the ceiling in their actions. Then you definitely protect the basement from the cold and moisture. Here only then should undertake work on the decoration of walls, ceiling and floor.

You can also use foam and extruded polystyrene.

Thermal insulation on the inside of the foundation

Thermal insulation foam from inside the house foundation

Materials and methods of insulation from the outside of the foundation

As the insulating materialYou can then use foam, polystyrene foam and polyurethane foam. Last is applied in the same manner as in the insulation of the foundation from the inside, just before the spray polyurethane foam, will need to do some preparatory work to expose the bottom of the foundations of the house.

Thermal insulation with polyurethane foam foundation

Thermal insulation with polyurethane foam foundation outside home

Operational method - polystyrene foam insulation

For insulation foam or polystyrene foamYou will need to release all the foundations of the earth. To this end, the perimeter of the house dug a trench to a depth of foundation width of about 40-50 cm. Then the surface is carefully trimmed off the ground and aligned residues (if, of course, necessary). On a clean, dry wall is applied waterproofing, and then on a special adhesive or mastic asphalt insulation sheets are attached. The joints are filled with foam in between (this technique will protect the foundation from moisture).

Insulation of the basement of the building from the outside

Thermal insulation of expanded polystyrene foundation outside the building

Important: the upper sheets of insulation should rise at ground level by about 40 cm - and it will protect the foundation and walls of the possible rise of the water table.

After all the work for gluing sheetsStyrofoam or foam completed, you can start filling the trench. On its bottom is filled with a layer of sand (10 - 12 cm), then you can put the insulation sheets (but you can not put), after - a layer of gravel (60 - 70 cm), and then you can pour concrete, you can sleep in the same sand, and it is possible to roll up the asphalt. If you are a creative person and love to all original and unusual, it is possible to decorate all stone or tiles.

Provide thermal insulation using expanded clay

Another method of insulation on the outside of the foundation -is the use of expanded clay. However, this method has already been partially goes into oblivion, as it is quite cost and inefficient, though our parents in the construction of houses to use it.

The process of warming of expanded clay in many respects similar to theinsulation foam. Digs a trench width of not less than 1 meter for the rest of the basement depth. At the bottom of the trench is laid waterproofing material, and fall asleep on top of expanded clay granules. The layer should be thick enough, because the expanded clay has a very weak thermal insulation properties. On top of expanded clay roofing material is laid and poured sand or earth.

External insulation of the foundation of expanded clay

External insulation of the foundation of expanded clay

If you choose to save on workers and to holdinsulation of the foundation with his own hands, you can use for this purpose not only modern materials, but also those that were used by our ancestors. However, the good of straw, peat, leaves or needles will not be enough, because if these are available, the natural "insulation" really helped in the fight against the cold and frost, unless the person would seek to replace them?

Thermal insulation of the foundation, what would you have spoken,necessary in any case, because the weather conditions in Russia is so unpredictable, that even the weather forecasters are not able to answer the question of what will happen to us tomorrow. Even if you live in Sochi and the Krasnodar region, where temperatures usually remained stable near zero, do not risk, and be engaged in his house, otherwise then it will be too late.

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