Who works before and after the waterproofer: the sequence at the wall and the deck
The landscaper plans to install irrigation sleeves after the podium membrane. The electrical foreman has light bases on the same later date. The waterproofing installer sees both activities as completed prerequisites, but the look-ahead treats the membrane as an isolated task.
Build the waterproofing sequence around area handovers and interfaces, not just the installer’s start and finish. Identify what must be ready beforehand, what needs review while exposed, and what later work could damage or alter the assembly. Put those conditions beside the scheduled activities. Where a penetration or accessory is intended for later installation, obtain the applicable designed detail and process rather than inventing a blanket rule that everything must happen first.
Draw the trade sequence around one area
- Choose a location boundary. Start with a wall section or deck zone shown on the current drawings. Define what the handover includes so the concrete, waterproofing and following crews use the same area name.
- List the required predecessors. Review the approved assembly with the affected leads. Identify substrate preparation, embedded items, drains, openings and other work whose readiness matters, then link each item to its current detail or decision reference.
- Resolve later alterations before installation. Ask the trades about planned penetrations, bases and access after the membrane. Send missing interfaces for the required design and manufacturer assessment. Do not let an undisclosed later operation become an assumed repair detail.
- Insert exposed-work reviews. Show the required inspections, tests, corrections and release decisions before covering. Name who arranges each input and leave the following activity conditional while an unresolved requirement remains.
- Assign protection between trades. Agree the approved protection, permitted access and handover owner for the next activity. Identify who checks for damage and reports it before an area disappears under backfill, topping or landscape work.
- Review the chain at the look-ahead. Read each area from its prerequisites through final covering with the responsible leads. Record changed conditions and owners. Updating the installer’s date alone does not resolve a missing drain detail or an unarranged test.
Common mistakes
- Scheduling membrane work without its area prerequisites.
- Assuming a later penetration can be repaired without an approved detail.
- Giving covering work a firm start before required releases are arranged.
Action list
Put these items beside the area dates
- Location boundary shared by all trades.
- Prerequisites with readiness owners.
- Later work and approved interface arrangements.
- Exposed-work review and test gates.
- Protection, damage reporting and covering handover.
Check your understanding
The membrane crew is ready, but a planned sleeve has no approved interface detail. What should the schedule show?
