after granular base materials, dampproofing membrane and if applicable, reinforcing steel has been placed for the inatallation of a concrete floor slab but prior to placing of concrete; 10.2.4. before a building drain, sanitary or storm sewer is covered, and if any part of a plumbing system is covered before it is inspected and approved it shall be uncovered if a Building Inspector so directs, and when considered necessary, underground building drains, branches, storm drains, and sewers shall be re~tested after the completion of all backfilling and grading by heavy equipment; 10.2.5. when framing and sheathing of the building are complete, including fire-stopping, bracing, chimney duct work, plumbing, gas venting, wiring, but ~“:fore any insulation, or other faterior or exterior nish Ls applied which would conceal such work; after the placing of insulation and vapour barrier but before any interior finish is applied; and after the building or portion thereof is complete and ready for occupancy, but before any occupancy of the building. Prior to the occupancy of any building or part thereof after construction or alteration, or any change in clases of occupancy, the owner or occupier shall obtain an occupancy inspection from a Building Inspector, which shall not be complete until the building or part thereof complies with the requirements of this Bylaw and all other requirements relating to the construction and occupancy of the building. In all cases where it is proposed to conduct the waste from plumbing fixtures, trade waste or surface or roof water to a public sewer the Owner. shall ensure that such public sewer is at a sufficient depth and of a capacity to receive such discharge; and shall arrange the plumbing to suit the location of the connection provided for the lot.