ETI Thermal isolation

Save by thermally insulating the home.




Nowadays in Spain, 47% of energy expenditure in a home is due to heating and 18.9% to air conditioning. This expense is higher than in other countries in Europe where it is colder in winter. The reason is that homes in Spain are not well thermally insulated.


According to the energy certifications carried out in recent years, most homes do not obtain more than a G, which means that when they want to heat the house in winter or cool the house in summer, much of this energy is lost.



This results in more energy consumption, more pollution, more economic spending and less comfort.


If the heating goes through the walls, it means that the walls are cooler than the rest of the house and still generates a feeling of colder than we try to compensate by consuming more heating.





To prevent this from happening, it would be ideal if the houses in the summer were like a refrigerator in which the cold did not come out and in the winter it would have a blanket around it so that the heat would be retained. The only way to achieve this effect is to isolate the house: walls, roofs, windows and floors.


If we make a photograph with a thermal camera to a house before and after isolating it, the comparison is very clear. Before insulating it, the exterior walls give off a lot of heat (reddish color) whose origin is the heating of the house. On the other hand, after isolating it, the color is more bluish greenish, which indicates that it is just releasing that heat, so that energy is not lost.




Thanks to the isolation of the house, the energy certification, on average, improves to a C. What it means is a saving in energy consumption, less CO2 production and more economic savings.




In about 5 years, the cost of insulating the home is amortized. In addition to the economic savings involved, comfort and quality of life within the home is much better.




Other ways to save on heating are:

  1- Isolate the house.

  2- Replace the windows with ones with thermal break, double glass with air chamber.

  3- Close the blinds and curtains during the night.

  4- Ventilate the house in the warm hours and only 10/15 minutes.

  5- Turn off the heating at night.

  6- Keep the heating at a constant and moderate temperature (19-21º).




Systems to isolate homes

There are two systems to isolate the house: inside and outside.

On the inside there are two options. The first consists of filling the air chambers inside the façade with foams or some amorphous insulating material. Perforations are made every certain distance and filled. This system generates the discomfort of breaking the coating and then having to repair it by patching, which means having to paint the entire house once it is finished and you can not ensure that the entire chamber has been filled in, leaving spaces without isolating.

The second option for the interior is to place a wall (can be ceramic or laminated plaster) on the inside with insulation between the facade and the new wall. This solution is the least used, since space is lost inside the house, you have to re-coat the interior, make the passage of facilities, and that means an excessive cost.

The two options for insulation on the inside have a drawback, thermal bridges are not eliminated since the insulation is not continuous.

On the other hand, thermal insulation on the outside is continuous since it is not cut by slabs, pillars ... so it is more effective.


Exterior Thermal Insulation System (ETI)


The ETI system consists of:

  • Anchoring thermal insulation to the facade.
  • Apply a layer of mortar with anti-cracking mesh to guarantee the durability of the coating.
  • A second layer of mortar.
  • One last layer of mortar of the color and the texture that is desired. By including the color in the mortar it is not necessary to paint it, so it improves its durability.


This system achieves very little weight and little thickness (that of insulation) to insulate the exterior of the whole house, including blind boxes, branches and sills windows. The most frequent thicknesses range from 4 to 8 cm. The result is a continuous, resistant and low maintenance coating.

For this reason, in Intercons we have specialized in the isolation of weber.therm, which, with very little thickness, we isolate on the outside with a mineral finish in which you can choose the color among a great variety.


Examples of real houses


In this photograph you can see how the facade is isolated without leaving any space in between.

The plates are thin and groove so that in the joints there is no stone energy either.

Even the window blinds that are usually critical points in isolation are covered.


There are several types of insulation. Depending on the final finish desired on the façade, we will opt for one or the other. The most common finishes are: mortar, stone, tile and ventilated with panels of different textures.


Mortar coating


The mortar coating is the most economical, lightest and thinnest.

For that reason it is the most used.

In this case, the color chosen was white.




The stone cladding is a finish whose weight, thickness and price depends on the type of stone chosen.


Ventilated with panels


The system of panels with ventilated air chamber is the best to isolate. Being a continuous insulation (like all systems SATE) isolates from the cold. And the heat by the cooling that is generated between the shadow that gives the panel to the facade and the ventilation of the air chamber.