Ceramic thermal barrier coatings (TBC) are widely applied for protecting from combustion gases hot path components of gas turbines for both aero- and land-based applications. In order to prevent the detachment of TBC, it would be essential to monitor their degradation in terms of sintering kinetic. As sintering strongly affects also the thermal diffusivity of TBC, the idea is to measure the latter parameter to account for the former. The technique to measure thermal diffusivity variation with ageing was recently presented. Tests and results concerning the through-thickness thermal diffusivity on TBC specimens artificially aged were reported. Pulsed Thermography together with the model that leads to the identification of diffusivity for both through-thickness and lateral diffusion was used for that purpose. Thermal Wave Interferometry (TWI) is a photothermal technique used to evaluate thermal parameters when steady periodic conditions are applied to the material. In the present work a recall of the main results obtained with Pulsed Thermography for this application is given. After that, TWI technique is used to measure again the through-thickness thermal diffusivity of the same samples artificially aged and yet tested with Pulsed Thermography. Laser-Flash technique is also applied to one layer of TBC in the as-sprayed condition.