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AAN-03 · Al-Aan
Al-Aan Palace — gatehouse
House · 1 storeys · 60 m² E elevation built c. 1688estimated criticality 3/5
Latest capture
19 Aug 2026 · 77 d ago
Measured on this visit
2.4 mm
max crack width
6%
surface loss
14%
salt loading
Watch
marker MK-AAN-03 · confidence 87% · N. Al-Souqour
Risk
0–100
34Watch
stableintervene
Time to 5 mm39 months
Growth rate0.07 mm / month
Intervention estimateSAR 21,500
Findings
5 captures
Surface loss
dominant mechanism on the last visit
Rising damp line at 50% 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
19 Aug 2026
| Defect | Width | Length | Face | Mechanism | Drives risk |
|---|---|---|---|---|---|
| Defect 1 | 2.4 mm | 2,635 mm | N | Surface loss | worst |
The wall carries 1 separate defect 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 |
|---|---|---|---|---|---|---|---|---|
| 19 Aug 2026 | 2.4 mm | 6% | 14% | 50% | Surface loss | N. Al-Souqour | MK-AAN-03 | 87% |
| 25 Feb 2026 | 2.1 mm | 5% | 10% | 36% | Water ingress | N. Al-Souqour | MK-AAN-03 | 89% |
| 03 Sept 2025 | 1.7 mm | 4% | 8% | 73% | Salt crystallisation | Field survey | MK-AAN-03 | 98% |
| 11 Mar 2025 | 1.3 mm | 2% | 9% | 44% | Structural crack | N. Al-Souqour | MK-AAN-03 | 87% |
| 17 Sept 2024 | 0.9 mm | 2% | 9% | 63% | Surface loss | N. Al-Souqour | MK-AAN-03 | 88% |
Field note
Entry structure on the wall line; date not separately published. Guardian: N. Al-Souqour.
Site reference: Najran Municipality — أبرز معالم نجران.