I-3 "idiski yokusila ifaneleke kakhulu kwi-concrete yokusila kunye nemigangatho ye-terrazzo. Kulula ukuyitshintsha kwaye ayifuni ukubhabha ngokukhawuleza ngelixa ucola. Ukujikeleza ngaphaya komphetho kunokucima kakuhle i-lippage yomgangatho kwaye kunciphisa kakhulu imikrwelo emgangathweni. Inezahlulo ezi-6). 7.5mm ubude) kwaye yomelele kakhulu.