Basement & foundation waterproofing for duplexes in Rafha

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

Why basement & foundation waterproofing differs in Rafha

The centre of Rafha sits about 451 m above sea level (SRTM open elevation data).

Rafha sits about 451 m above sea level, which means the first thing a technician checks on a duplex basement is how water is likely to reach the walls and floor rather than assuming it comes from above. Ground conditions and the position of the basement relative to surrounding levels decide where water collects, so the inspection starts at the lowest points of the slab and the joints where the walls meet the floor. Cracks are logged by length in metres, because crack injection is priced per metre and the scope has to be recorded before any work begins.

Several things are left to the site visit, because they cannot be judged from a description alone. The technician must see the actual condition of the basement walls, measure the wet areas in square metres, and decide whether the work calls for basement waterproofing, which is priced per m² at SAR 50–150, or a lighter option. Epoxy coating at SAR 35–90 per m², spray foam at SAR 20–45 per m², and XPS boards at SAR 12–30 per m² each suit different surfaces and moisture levels, so the choice is made on site. Bathroom waterproofing at SAR 15–40 per m² and liquid roof waterproofing at SAR 8–25 per m² are separate scopes and should be measured and quoted separately. Any tank that holds water needs its own assessment, with tank internal coating at SAR 25–60 per m² as one possible route.

To help the technician, record the basement floor and wall areas in square metres, mark every crack with its length in metres, and note whether water appears after rain or constantly. Note which rooms are bathrooms and which surfaces are roofs, bitumen membrane (SAR 15–35 per m²) being one option for some roof sections. Take photographs of the lowest corners and any staining, and confirm access to the basement before arriving. Clear notes of area, crack length and water pattern let the technician match each surface to the right system and give the resident a clear, itemised estimate.

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

Signs that call for basement & foundation waterproofing

If you notice one of these signs in Rafha, it is a good moment to talk to the team:

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

The most common causes

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

Tools we use in Rafha

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.

Quick comparison: facts and costs in Rafha

Short answers for Rafha

Mistakes that cost more

• Painting the basement wall while the water comes from outside

The written outputs

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