Despite SMC addition provides a decreasing in the mechanical response, it may help strong insulation in building bricks. TC response ranges from 0.7 W/m K without additive to 0.5 W/m Kapprox. when 17% of SMC was added (see Fig. 7). SMC addition increases porosity in the firing process due to high temperatures.This porosity increases the scattering processes of the network of phonons responsible for transmitting heat and reduces the overall conductivity of the bricks [50].