As suggested by other contexts excavated last year in F east, the association between tufo slabs floor and a preparation made by smash red tufo could mark the way from outdoor to covered spaces.In this case, particularly, since the SU 5589 seems more and more compatible with an inner courtyard (impluvium?), the layer could be identified with its corridor. See further interpretation under SU 5762.
Room 17 floor slabs and cuts