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AAN-01 · Al-Aan
Al-Aan Palace (Sa‘dan)
Palace · 4 storeys · 248 m² E elevation built 1688documented criticality 5/5
Latest capture
17 Aug 2026 · 79 d ago
Measured on this visit
2.4 mm
max crack width
4%
surface loss
15%
salt loading
Watch
marker MK-AAN-01 · confidence 94% · S. Al-Makrami
Risk
0–100
36Watch
stableintervene
Time to 5 mm90 months
Growth rate0.03 mm / month
Intervention estimateSAR 46,500
Findings
5 captures
Salt crystallisation
dominant mechanism on the last visit
Rising damp line at 29% RH
salt crystallisation risk band
E face exposed to prevailing wind
drives the wet–dry cycle above 44 °C
Crack width over time
mm · measured, then forecast
Dots are accepted captures. The dashed tail is a linear projection of the measured rate — it is what moves this structure up the intervention queue, not the current width alone.
Defects on the latest visit
17 Aug 2026
| Defect | Width | Length | Face | Mechanism | Drives risk |
|---|---|---|---|---|---|
| Defect 1 | 2.4 mm | 1,246 mm | NW | Salt crystallisation | worst |
| Defect 2 | 1.3 mm | 1,139 mm | NE | Surface loss | — |
| Defect 3 | 1.3 mm | 732 mm | SW | Surface loss | — |
| Defect 4 | 0.9 mm | 624 mm | E | Structural crack | — |
The wall carries 4 separate defects at this visit. The widest one sets the risk band; the others are counted and carried in the record.
Capture ledger
5 accepted
| Date | Crack | Loss | Salt | RH | Mechanism | Captured by | Marker | Confidence |
|---|---|---|---|---|---|---|---|---|
| 17 Aug 2026 | 2.4 mm · +3 | 4% | 15% | 29% | Salt crystallisation | S. Al-Makrami | MK-AAN-01 | 94% |
| 13 Mar 2026 | 2.2 mm · +3 | 5% | 10% | 53% | Surface loss | S. Al-Makrami | MK-AAN-01 | 91% |
| 06 Oct 2025 | 2.2 mm · +3 | 5% | 11% | 73% | Salt crystallisation | Field survey | MK-AAN-01 | 97% |
| 02 May 2025 | 1.9 mm · +3 | 5% | 13% | 74% | Structural crack | S. Al-Makrami | MK-AAN-01 | 88% |
| 26 Nov 2024 | 1.8 mm · +3 | 5% | 10% | 64% | Salt crystallisation | S. Al-Makrami | MK-AAN-01 | 92% |
Field note
Built in 1100 AH on Jabal al-Aan, on stone foundations, four storeys; still inhabited and encircled by a mud wall. Guardian: S. Al-Makrami.
Site reference: Najran Municipality — أبرز معالم نجران.