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Comparing systems with the same number of layers of the same thickness, it is noted that the higher thermal delays match the systems with lower thermal diffusivities in the material that differentiates between them.

Of the studied multiple layers systems and where the insulation is applied on the exterior, it is noted that the thermal delay achieved by ICB solutions with only 60 mm are equivalent to those achieved by XPS / MW systems of 100 mm. In the case of insulation being applied on the interior, the thermal delay of ICB systems with 60 mm thick is only exceeded by XPS / MW systems which are 80 mm thick. (source ITeCons).

The thermal inertia can be defined in a simple way as the ability of a material to store the heat and the restore bit by bit. It ensures comfort, in Summer it prevents overheating and in Winter keeps the heating inside.

The Thermal Inertia involves two phenomena: Thermal delay (or lag) and temperature range reduction.

The thermal lag of the solutions indicates the time difference between a temperature change on one surface of the building system and its expression of this variation on the opposite side, when the system is subject to a variable rate of heat transfer. Solutions with a higher thermal lag contribute to improving the thermal performance of buildings, as they slow the loss or gain of heat through the surrounding.

More thickness, greater thermal lag

Increasing thermal insulation decreases the heat transfer coefficient and increases the thermal lag.