The procedures and results presented indicate the viability of utilizing microstructural characterization and computation to estimate the thermal conductivity of FRMs at elevated temperatures. However, the computational procedures can not be applied blindly, due to the many complicating factors present in these materials. It is only with a detailed understanding of the microstructural components of these materials and their changing nature with increasing temperature that truly adequate predictions can be envisioned. The influences of total porosity (or equivalently density), pore size, and pore connectivity on heat transfer were all highlighted in the current case studies.