Opc eduku payan paduthalam ppc edukunu solunga bro Loft, sunshade, underground sump, drainage system ku enda cement nu clarity a podunga bro Because neraya channela a common ah ida than சொல்றாங்க Roof concrete pillar beams columns idukulam enda cement usepananum opc or ppc , opc na adula ena grade use panalam