Grindable formwork body for direct and seamless installation of levelable cassettes, nominal size 9, in surface-finished screeds / terrazzo floors. The formwork is placed floating on underfloor boxes with mounting cover nominal size 9 and closes the gaps between the underfloor box and the cassette frame. The protective cover made of aluminum sheet is inserted into the cassette frame as a dummy before the screed work and can be sanded over with the screed/terrazzo.
