Basement & foundation waterproofing for duplexes in Sabya

Prepared by the technical team · editorial review · last updated 13 November 2026 · Sources

Why basement & foundation waterproofing differs in Sabya

Sabya is about 16.7 km from the sea coast (OpenStreetMap). The centre of Sabya sits about 40 m above sea level (SRTM open elevation data).

Main roads in or near Sabya: King Fahd Road, King Abdulaziz Road, King Abdullah bin Abdulaziz Road. Team note on Sabya: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins..

Does a duplex in Sabya really need basement waterproofing, given how far the town sits from the coast? The centre of Sabya sits about 40 m above sea level (SRTM open elevation data), and it is about 16.7 km from the sea coast (OpenStreetMap). Those facts mean the town is not low-lying ground, but damp can still reach a basement through cracks, poor drainage and old joints in the walls and floor. For a duplex owner, the real question is not elevation alone but whether water is entering the lower level, and whether the chosen method suits the surface involved.

Our inspection starts with a walk through the basement and the outer walls to find where moisture shows up. The inspector looks at wall faces, floor edges and any cracks, and notes their length, since crack injection is priced per metre at SAR 40–120 per m. Basement waterproofing is priced per m² at SAR 50–150 per m², so the measured area of walls and floor drives the quote. Where water comes through the roof slab or a terrace above, the inspector checks that surface separately, because liquid roof waterproofing runs at SAR 8–25 per m² and bitumen membrane at SAR 15–35 per m². The findings are then matched to a method such as epoxy coating at SAR 35–90 per m², spray foam at SAR 20–45 per m², or XPS boards at SAR 12–30 per m², and each option is explained before any work is agreed.

To prepare for the visit, clear the basement as far as you can so the walls and floor are reachable, and note where you have seen damp, staining or peeling paint. If a water tank sits on the property, make it accessible too, since tank internal coating is priced at SAR 25–60 per m². Bring any earlier repair records or drawings of the duplex, and tell the team which areas leak most after rain. Having this ready helps the inspector measure accurately, so the quote reflects the real surfaces rather than estimates.

In a duplex, the two floors often share lines, so tests are done floor by floor.

When do you need basement & foundation waterproofing?

The following signs are worth checking before they grow:

• Salt marks at the bottom of the walls
• Damp basement walls
• Water seeping in after rain

Where the problem usually comes from

• A common cause: a high groundwater level.
• A common cause: rainwater draining towards the foundation.
• Cracks at construction joints — we check this before anything else.

How we choose the tool in Sabya

The steps in order

1. Finding the source: Groundwater, rain or a pipe — each needs a different treatment.
2. Preparation: Surfaces are cleaned and opened where needed.
3. Injection: Active cracks are injected.
4. Waterproofing layers: The system is applied on the right side of the wall where possible.
5. Follow-up: Readings are repeated after the treatment.

Sabya in facts and sources

Questions from Sabya

What we advise against

• Painting the basement wall while the water comes from outside

What you get after the work

The written output: the source, the treatment and the follow-up result. The report is numbered and can be checked with its verification code.