In 2025, Egyptian researchers mixed eggshell waste into clay bricks to block the walls from absorbing outside heat and transferring it indoors during hot climates; heat transfer dropped 50%

Egyptian researchers tested clay bricks containing eggshell waste and found that a 10% eggshell formulation fired at 1,100°C reduced thermal conductivity by 50%. The eggshells changed the brick's pore structure, slowing heat movement. The approach could recycle food waste into construction materials with potential insulation benefits, particularly for buildings in hot climates.