Who sizes and seals a core-drilled service penetration?

Ask the plumbing, mechanical or electrical trade what passes through the opening and whether a sleeve is specified. Identify the wall or floor assembly, the material of the service and any insulation around it. Keep a reference to the approved detail beside the hole ID in the opening schedule.

Do not substitute the outside diameter of the bare pipe for the required concrete opening. Equally, a larger hole is not automatically a more useful hole. The receiving assembly may depend on a particular relationship between its components.

Where a fire-resisting assembly is involved, have the responsible designer and firestop installer identify the applicable system and its opening requirements. Hilti's firestop resource centre provides system documentation and inspection resources. It is not a universal specification for every penetration, nor proof that a particular product suits this project.

Water, air and acoustic sealing may be separate requirements. Record who confirms each one. This guide does not select a sealant, annular clearance or fire rating, and CoreCut's drilling scope does not imply that it includes the completed seal.

For each opening, record the drawing reference, approved size, receiving trade and sealing responsibility. If the intended service changes, return the detail for review before enlarging or reusing the hole. Multiple trades should not treat an unlabelled opening as spare capacity.

At handover, give the next trade access to inspect the opening and note any difference from the detail. Assign temporary protection while the opening remains unused. Keep the completed penetration record with the building information rather than losing it after the drilling visit.

Discuss core drilling and send the proposed scope, including who will approve the penetration detail and complete its seals.