The possibility of producing lightweight clay bricks using combustion waste obtained from the residue (pomace) in olive oil production is reported. The introduction of a combustible additive to the clay body makes the material lighter and more porous. An attempt was made to assess how, and in what quantities, this waste affects the brick characteristics. Research was carried out in three stages: characterisation of the clay and pomace; thermal analysis of firing behaviour; and characterisation of fired product properties using different pomace contents (0-14%). The weight loss and shrinkage during firing, bending strength, water absorption, density and porosity, and thermal conductivity were found to vary with pomace addition, whereas the presence of calcareous inclusions, efflorescence, and variation of pH of distilled contact water (characteristics that may be attributed to the earthy materials) were unaltered. A high reduction in strength suggests that more research is necessary for assessing the effects of lower pomace contents in the body (less than 7.4 wt%). 5 refs.