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UKH-01 · Al-Ukhdood
Al-Ukhdood — site wall
House · 1 storeys · 155 m² NW elevation built c. 1000estimated criticality 4/5
Latest capture
17 Jul 2026 · 110 d ago
Measured on this visit
2.7 mm
max crack width
6%
surface loss
13%
salt loading
Watch
marker MK-UKH-01 · confidence 93% · S. Al-Makrami
Risk
0–100
36Watch
stableintervene
Time to 5 mm19 months
Growth rate0.12 mm / month
Intervention estimateSAR 35,500
Findings
5 captures
Salt crystallisation
dominant mechanism on the last visit
Rising damp line at 45% RH
salt crystallisation risk band
NW 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 Jul 2026
| Defect | Width | Length | Face | Mechanism | Drives risk |
|---|---|---|---|---|---|
| Defect 1 | 2.7 mm | 455 mm | S | Salt crystallisation | worst |
| Defect 2 | 0.8 mm | 922 mm | SW | Water ingress | — |
| Defect 3 | 0.8 mm | 503 mm | E | Salt crystallisation | — |
The wall carries 3 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 Jul 2026 | 2.7 mm · +2 | 6% | 13% | 45% | Salt crystallisation | S. Al-Makrami | MK-UKH-01 | 93% |
| 11 Mar 2026 | 2.2 mm · +2 | 5% | 14% | 36% | Structural crack | S. Al-Makrami | MK-UKH-01 | 99% |
| 04 Nov 2025 | 1.6 mm · +2 | 4% | 10% | 36% | Surface loss | S. Al-Makrami | MK-UKH-01 | 87% |
| 29 Jun 2025 | 1.2 mm · +2 | 3% | 5% | 75% | Structural crack | S. Al-Makrami | MK-UKH-01 | 86% |
| 21 Feb 2025 | 0.7 mm · +2 | 3% | 5% | 54% | Salt crystallisation | S. Al-Makrami | MK-UKH-01 | 87% |
Field note
Surviving masonry of the archaeological site south of Najran city; occupation reaches back to the first millennium BCE. Guardian: S. Al-Makrami.
Site reference: Al-Ukhdood archaeological record.