4441 Insulation and protection to roofing membranes (4) Insulation, protection and reflective finishes installed subsequent to and when not part of the laying of the roofing membrane 4442 Trafficable surface on roofing membranes (10) Providing a trafficable surface on a roofing membrane subsequent to and when not part of its installation 4443 Soil and sod roofing (0) Soil and sod roofing