A blocked outlet exposes missing coordination
A fictional low-slope roof is being reviewed before handover. The visible membrane looks neat, but a temporary storage arrangement blocks the principal drainage inlet. The drawings show an additional overflow route, yet the reviewer cannot find its completed connection or the evidence that its discharge is safe. A subcontractor proposes signing the roof off because no rain has fallen during the inspection. The designed loads, test method and current acceptance criteria are not supplied in this classroom exercise. No outlet is modified and no roof is flooded. Identify the difference between visual appearance, a functioning coordinated drainage system and the documentary evidence needed before an accountable acceptance decision.
1. Why is appearance insufficient?
Read the worked answer
The water route, blockage response, actual interfaces and required verification remain unresolved; dry weather does not test those functions.
2. What should be established next?
Read the worked answer
Trace the approved normal and emergency drainage arrangements, remove inappropriate obstruction through the safe responsible process and obtain relevant inspection evidence.