Basement & foundation waterproofing for duplexes in Ahad Rafida

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

Before we start: what we know about Ahad Rafida

Main roads in or near Ahad Rafida: King Khalid Road. The centre of Ahad Rafida sits about 2055 m above sea level (SRTM open elevation data).

Team note on Ahad Rafida: 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..

Picture a family who has bought a duplex in Ahad Rafida, with a basement that doubles as storage and a lower unit that is rented out. After the first heavy rain they notice a damp patch on the basement wall, a faint smell, and a hairline crack running down from the corner. They want to know whether this is a small fix or a sign of a deeper problem, and how much it is likely to cost before anyone starts digging.

The location matters here. The centre of Ahad Rafida sits about 2055 m above sea level, so the land is high ground, but height does not make a basement dry. Water still finds its way through cracks and joints, and a duplex with two households depending on the same structure has less room for error. Typical prices given for this kind of work are basement waterproofing at SAR 50–150 per m², crack injection at SAR 40–120 per metre, and bitumen membrane at SAR 15–35 per m². These ranges help an owner compare options, but the final figure depends on the wall area, the number of cracks, and the condition of the surface.

A sensible sequence starts with a close look before any product is chosen. Mark every crack, note where the dampness appears, and check the roof and any tank, since water entering from above can look like a basement leak. Next, decide the scope: if the cracks are active, injection may be the first job, and the wall surface can then be treated with epoxy coating at SAR 35–90 per m² or spray foam at SAR 20–45 per m². Where a bathroom above has its own leak, bathroom waterproofing at SAR 15–40 per m² should be dealt with at the same time. Finish with the roof, using liquid roof waterproofing at SAR 8–25 per m², and check that the work on each floor has been completed and signed off before the unit is rented again.

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.

How we choose the tool in Ahad Rafida

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.

Ahad Rafida in facts and sources

Short answers for Ahad Rafida

Mistakes that cost more

• 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.