ABSTRACT
Secondary clay obtained from Bomo, Zaria, Kaduna state was used for this research. Dry samples were fired to produce grog which was crushed and sieved to mesh 20 (840microns). Body composition was formulated with 5, 10, 15, 20 and 25% additions of grog to the clay body with the different samples sintered to three varying temperature ranges of 900oC, 1000oC and 1150oC. Samples fired to the highest temperature sintered properly compared to others and thus had a low water absorption rate of 6%. Results of the Tensile strength and Cold crushing strength tests showed that samples with 5% grog addition fired to 1150oC had the highest values of 3736.82 N/mm2and 285.45 kg/cm2 respectively. These strength property results revealed that samples with low percentages of grog, resisted load better than samples with higher additions. This research indicates a huge prospect of developing grogged clay roofing tiles using locally available clay from the study area.