Building Technology, Design and Construction: Statutory Control, Detailing and Site Practice
This domain tests technical judgement: how statutory controls shape design, how details perform, and what good site practice looks like. Questions often present a detail or a site situation and ask you to identify what will fail and why.
Statutory control of building work
- The Buildings Ordinance (Cap. 123) and its regulations govern planning, construction and fire safety. The Building Authority (Director of Buildings) approves plans, grants consent to commence, and issues occupation permits.
- The AP/RSE/RC system: an Authorized Person (registered architect or engineer), a Registered Structural Engineer and a Registered Contractor. Work must follow approved plans; changes require amendment submission. No occupation before an occupation permit or temporary occupation permit.
- Site supervision is structured through supervision plans and technically competent persons, with records of inspections and tests.
Design, materials and detailing
- Durability: Hong Kong's humid, marine-influenced environment demands adequate concrete cover, the correct cement type for exposure, and careful treatment of embedded metals; corrosion starts where cover is short and compaction poor.
- Waterproofing: continuous membrane, upstands at planters and wet areas, protection screed, correct falls and outlets, and flood testing before covering up.
- Movement: expansion and construction joints, curtain-wall tolerances, thermal and wind movement, drainage and weep holes.
- Fire: compartmentation, protected escape routes, fire resistance periods, sealing of service penetrations.
- Buildability and MiC: module tolerances, joints, lifting points and connection details must be designed, not left to the site.
Site practice
- Inspect before covering up; set hold points for reinforcement, waterproofing, drainage tests and services.
- Concrete: grade, workability testing, cube testing, curing, cold-joint treatment.
- Records: site instructions, non-conformity reports, method statements and inspection sign-offs.
Worked example
A rooftop planter leaks into the flat below. The detail shows the membrane stopping at the slab edge, no upstand above soil level, no protection screed and no flood test. The failure path is clear: water enters at the edge, travels beneath the membrane and finds a slab penetration. The fix is an upstand above finished soil level, membrane dressed and terminated correctly, protection and drainage layers, a proper outlet, then a flood test recorded before covering.
Traps that cost marks
Treating the occupation permit as proof of every aspect of compliance; detailing from memory without checking approved plans; specifying ordinary cover for a marine-exposed element; accepting "it has always been done this way" as a construction justification.