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Today we are going to talk about the main element of a SATE system: the INSULATING MATERIAL. As we mentioned in the previous post, the SATE is a external thermal insulation system which is used in the rehabilitation of facades to improve the comfort and energy efficiency of buildings. The main advantages of a SATE system are:

  • First, the thermal comfortThis system reduces thermal oscillations.
  • The energy savings and therefore the reduction in costs heating and cooling. This brings benefits environmental by optimizing energy consumption.
  • A new healthy indoor atmosphere by eliminating thermal bridges and possible condensation humidity.
  • The revaluation The economic value of the property, together with its aesthetic improvement and an increase in the useful life of the façade.


The insulation is the main element of the system. The technician selects the material according to the performance and needs of the client, and its thickness is determined from the CTE, with the help of energy simulation programs depending on the location of the building. Below is a brief description of the materials most commonly used in these systems:

  • Mineral wool. These are materials highly breathable, acoustic insulators and can be considered fireproof as they are very stable at high temperatures. As disadvantages they are heavier and special protections are needed for their handling.
  • EPS panels. This is the most common solution, and may have thicknesses up to 16 cm. It is a light, synthetic material that can be handled without special protective measures. It should always be placed protected from both rainwater and sunlight.
  • XPS rigid panels. they are most commonly used only on the first floor. It is a denser material with better mechanical characteristics which make it more impact resistant. Likewise, by having a low water absorption which avoids capillarity even in contact with the ground.


Although thermal conductivity is the significant property of these materials to determine their thermal insulation capacity, there are other values to take into account such as: their acoustic insulation capacity, their reaction to fire, their permeability to water or their resistance to compression. We attach below some orientative data on the main materials used as insulation in this system (mineral wool, polystyrenes...): 

SOURCE: weber SATE Guide

With these data we can assure that they are all excellent materials for thermal insulation. We can also detect a series of advantages of mineral wool over expanded polystyrene (EPS), such as its greater acoustic insulation, its lower breathability, which improves its performance against moisture problems due to interior condensation, and its recyclability. On the other hand, EPS is a cheaper material than mineral wool because less energy is consumed in its manufacturing process and its installation is somewhat simpler.

Today we just wanted to emphasize the importance of choosing the main element of an ETICS system: the INSULATING MATERIAL.

REMEMBER that this is a integral façade system in which all the components of a SATE must be designed and tested together for the use to be given to the system, and is the optimal solution to effectively comply with the provisions on Energy Efficiency (RD 47/2007 and CTE DBHEI), acting on the envelope of a building.

Do not hesitate to get in touch with us if you would like to request more information.  #SATE #facades #rehabilitation #sustainability 1TP5Energy efficiency #sustainability #sustainability #energy efficiency

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