Basement & foundation waterproofing for duplexes in Riyadh

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

Basement & foundation waterproofing in Riyadh: the local context

Main roads in or near Riyadh: King Fahd Road, King Abdullah Road, King Abdullah. The centre of Riyadh sits about 637 m above sea level (SRTM open elevation data).

Team note on Riyadh: 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..

Is it worth waterproofing a basement under a Riyadh duplex, and what does it actually cost? The centre of Riyadh sits about 637 m above sea level (SRTM open elevation data), and that elevation shapes how water moves through the ground around a home. For a basement, the work is usually priced per square metre, with basement waterproofing running from SAR 55–160 per m². Where the walls show hairline cracks, crack injection is priced separately at SAR 40–125 per metre, so a sound estimate depends on how much of the structure needs attention rather than a single flat figure. Owners often find that a short, well-scoped job on a few cracks costs far less than replacing finishes damaged by seepage.

A site visit normally starts with a walk through the basement and the adjoining bathrooms, since leaks often travel between them. The technician checks wall surfaces for damp patches, efflorescence and cracks, and notes where each defect sits. Bathrooms are assessed separately because they are priced on their own basis, at SAR 15–40 per m², and the floor and wall junctions are the usual weak points. The roof is inspected next, with liquid roof waterproofing at SAR 10–25 per m² and bitumen membrane at SAR 15–35 per m² as the common options, depending on the condition of the existing surface. Any water tanks are included, where internal coating is quoted at SAR 25–65 per m². The inspector then recommends which products suit each area, such as epoxy coating at SAR 35–95 per m², spray foam at SAR 20–45 per m², or XPS boards at SAR 15–30 per m² for insulation behind finished walls.

Before the visit, gather the details that make the assessment faster and the quote more accurate. Have the floor plans of both units ready, with the basement and roof areas marked, and note any rooms that leak or smell damp. Photograph visible staining, cracks and ceiling marks, and record when each problem first appeared, especially after rain. Clear access to the basement, the roof hatch and the water tanks, and let the technician know if any of these areas are in use by tenants. Having these items on hand lets the visit focus on the work itself and helps you compare the scope and prices against the ranges above.

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

Signs that call for basement & foundation waterproofing

These are the signs most often linked to basement & foundation waterproofing:

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

Causes we see in the field

• A common cause: a high groundwater level.
• A common cause: rainwater draining towards the foundation.
• A common cause: cracks at construction joints.

Tools and methods, and when we use them

From the first visit to the report

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.

Riyadh in facts and sources

Questions from Riyadh

Common mistakes we see

• Painting the basement wall while the water comes from outside

What you receive

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