Combining superior aesthetics with functionality. They use terracotta as the filler material. A filler slab is a construction technique used in building construction to reduce the overall weight of the structure without compromising its strength. The primary purpose of a filler slab is to fill the voids or spaces in the conventional reinforced concrete slab with lightweight materials, thus reducing the amount of concrete used. This results in a structure that is lighter, more cost-effective, and environmentally friendly.