The mosaic floor of the north stoa was uncovered in 1963 and found to be in very bad condition. Of the original floor that covered the entire stoa, only scattered parts survived. It was therefore decided to lift them, conserve them, and replace them on a new substratum. After the mosaic had been lifted, trenches were dug to investigate earlier construction phases. The trenches were filled in with crushed aggregate, which compressed very well to make a stable substratum. The new substratum had three layers, like the ancient one. After the surviving sections of the mosaic had been replaced, the missing geometrical motifs were filled in, in accordance with the graphic representation, using coloured mortar, to help visitors understand the design better. The mortar was a paler shade of the dominant colour of the motif in each case, in accordance with the graphic representation.
After a detailed survey of the mosaic, a graphic representation was made. The mosaic is laid out in three discrete panels with different geometrical motifs and a shared border of multicoloured chequer-work. The east panel is a rectangle containing mainly squares, lozenges, and triangles, its west side adjoining a band of tendrils and ivy leaves. In the centre of the middle panel are 4 octagons surrounded by hexagons. Between the hexagons twine meanders made up of guilloches. The whole design is bordered by a meander. The entire west panel is filled with a continuous ornament in the form of a double cruciform meander. The spaces between the bands of the meander are filled with squares and lozenges.