FAQ 1Latest finding: settlement contour at MN55
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Latest reading, MN55, 3 November 2026Where has the building settled?
What the picture shows
Dark is settled most, light is settled least. Settlement is measured from the start (MN0).- Most: BSM10 84.23 mm, BSM1 79.75 mm, BSM9 78.68 mm (east side)
- Least: BSM7 16.16 mm, BSM5 20.83 mm (west side)
- The east settles more than the west, so the raft leans towards BSM10 and BSM1.
- Tilt of the whole building 1/1409; the pair closest to 1/1000 is 1/1204. Both are within 1/1000.
Settlement is still increasing
Source: HIZ letter HIZC/24.05/WKE/18 (9 Nov 2026), p.2, Figure 1; Nattest Lab NTP26/0374 (MN55). Triangles P1 to P4 are extrapolated, not measured.
FAQ 1Latest finding: settlement against floor level
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Latest reading against the trend fitted to MN29 to MN54Settlement is still increasing
BSM10 reached 84.23 mm at MN55, above its trend line. BSM1 (79.75 mm) and BSM9 (78.68 mm) are also above their trend lines.
Source: HIZ letter HIZC/24.05/WKE/18 (9 Nov 2026), p.3, Figure 2, settlement panel for BSM10 (BSM1 and BSM9 panels on the same figure). Trend fitted to MN29 to MN54, MN55 added and not refitted. Roof is assumed.
FAQ 1Latest finding: bending between BSM1 and BSM4
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Angular distortion between BSM1 and BSM4Where is the bending heading?
How to read it
- MN55 sits on the trend line, within 1/1000.
- At the roof the trend is about 1/1060; the upper edge of the range is about 1/990, slightly beyond 1/1000.
- If a pair 30 m or more reaches 1/1000, a formal review is called for.
Within 1/1000 at MN55
Source: HIZ letter HIZC/24.05/WKE/18 (9 Nov 2026), p.3, Figure 2, pair BSM1 and BSM4. Trend fitted to MN29 to MN54, MN55 added and not refitted. Roof is assumed.
FAQ 1Latest finding: tilt of the whole building
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Tilt of the best-fit plane through the settlement markersWhere is the lean heading?
How to read it
- MN55 tilt is 1/1409 (MN54 about 1/1450), within 1/1000.
- At the roof the trend is about 1/1210; the range goes to about 1/1140.
- If tilt reaches 1/1000, a formal review is called for.
Tilt is the lean of the whole building
Source: HIZ letter HIZC/24.05/WKE/18 (9 Nov 2026), p.3, Figure 2, tilt panel; 1/1000 from BS EN 1990:2023 Tables A.1.15 and A.1.16 (cited, as in the figure). Trend fitted to MN29 to MN54, MN55 added and not refitted.
FAQ 2Is the settlement rate changing?
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Settlement is still increasing. Is it getting steeper or leaner?
YES, settlement is still increasing. The rate is about the SAME: about 4 mm for every floor cast, before and now. Not steeper, not leaner.
| mm per floor cast | Level 31 to 33.6 | Level 33.6 to 37.6 |
|---|---|---|
| BSM10 | 4.4 | 4.6 |
| BSM1 | 4.6 | 4.3 |
| BSM9 | 4.2 | 4.2 |
Per week it is faster now (about 2.3 mm a week since September, about 1 mm a week in July and August) because floors go up faster. Per floor it is the same.
Sketch not to scale. Data: Nattest Lab via series.csv, MN26 to MN55 (works resumed, Level 31, to MN55), straight-line fit per window; HIZ, 10 Nov 2026. Not a prediction.
FAQ 2Is the lean easing?
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
And the lean and bending: steeper or leaner?
Still increasing. Per floor cast, compared with before: the whole building's lean (tilt) and the bending between BSM1 and BSM4 grow slower; between BSM6 and BSM9 the same; between BSM2 and BSM10 slightly faster.
Not a sign that settlement is ending. One reading moves about as much as one floor of growth. Whether it is easing is for the Substructure Engineer.
Sketches not to scale. Growth per floor, Level 33.6-37.6 vs 31-33.6: tilt 0.76, BSM1 and BSM4 0.64, BSM6 and BSM9 1.02, BSM2 and BSM10 1.14 (HIZ trend working, 7 Nov). WKE/18 para 6 compared with the five levels before, which include the May-July casting hold (about half). Plan: marker positions from the project coordinates; grey = BSM5, BSM7 (not used). Shading = best-fit plane through the eight markers at MN55 (tilt 1/1409), darker where it has settled more; the arrow spans the raft to show the whole building leans; its length is not the size of the lean.
FAQ 3After completion
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Your question, 10 NovAfter the building is complete, will settlement keep increasing? Can we predict it now?
Most likely it will keep increasing for some time after completion, then get leaner and level off. The final value cannot be predicted reliably from today's readings: the load is still going up.
Why not now
- About 3.4 floors are still to be cast to the roof (slab 41), then finishes, services and occupants add more load.
- Today the settlement follows the floors cast (about 4 mm per floor). That gives the rate, not the end point.
- The settlement of a piled raft depends on the soil, piles and raft together. Only the Substructure Engineer holds that analysis.
Rough carry-forward, not a prediction: if about 4 mm per floor continues to the roof, BSM10 would be about 93 to 98 mm when the roof is cast.
Sketch not to scale; the shape after completion is the usual pattern for a foundation under steady load, not WSA data. Carry-forward: BSM10 straight line, Level 31 to 37.6 (3.9 mm per floor), from the line (93 mm) and from MN55 84.23 mm (98 mm), to Level 41. HIZ arithmetic, 10 Nov 2026, series.csv.
FAQ 3After completion, continued
WSA Phase 2 · settlement monitoring · as at MN55 (3 Nov 2026)
Your question, 10 NovHow will we know it is getting leaner and stopping? Do we keep monitoring?
Yes, monitoring continues after completion. Once the load is steady, we watch the settlement per month. When it falls reading after reading, it is getting leaner. It has stopped when it stays below a rate set by the Substructure Engineer.
| Stage | What we watch |
|---|---|
| Now to roof | Every cycle: settlement, the three pairs and the tilt per floor cast (as in WKE/18), Syarikat Ayob as the independent check |
| Roof to completion | Settlement per month as floors stop; finishes and services still add load |
| After completion | Settlement per month falling over several readings; estimate of the final settlement by standard methods once the load is steady (Asaoka 1978; hyperbolic method, Tan 1971) |
| Any time, including after completion | If the tilt or any pair 30 m or more apart (BSM1 and BSM4, BSM6 and BSM9, BSM2 and BSM10) reaches 1/1000, or distress or structural cracking is seen: a formal review is called for, and the Substructure Engineer reviews the foundation |
| Stop monitoring | When the rate stays below a value the Substructure Engineer gives (not yet part of the request in WKE/18 para 7) |
Sketch not to scale. Asaoka (1978), Soils and Foundations 18(4) 87-101; hyperbolic method after Tan (1971): developed for clay consolidation, a guide only for a piled raft. HIZC/24.05/WKE/18: "We will continue to monitor and report each round." 1/1000 for tilt and pairs 30 m or more: WKE/17 para 8; interim monitoring levels, not allowable values. Closest to 1/1000 now: BSM1 and BSM4 (MN55 1/1204; roof trend about 1/1060, upper edge 1/990, WKE/18 para 4); tilt 1/1409 (roof about 1/1210).
HIZ has asked, in writing, for the allowable settlement and angular distortion to be given, and set interim levels while waiting. The letters are listed in FAQ 4.