Basement & foundation waterproofing for duplexes in Alaridah

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

Why basement & foundation waterproofing differs in Alaridah

The centre of Alaridah sits about 2591 m above sea level (SRTM open elevation data).

The first thing checked on a basement or foundation job in Alaridah is the site's altitude, because it shapes how water behaves around a building here. The centre of Alaridah sits about 2591 m above sea level (SRTM open elevation data), so the ground is high and the slope of the land carries rainwater away quickly. Before any price is discussed, the technician looks at how surface water runs toward the duplex, where it pools against the lower walls, and whether the basement sits below the level of the surrounding ground. Pricing is set per square metre for the main works, with basement waterproofing typically SAR 50–150 per m², and crack injection priced per metre at SAR 40–120 per m. Those ranges are only starting points, because the final scope depends on what the walls and floor actually look like.

Several things are left to the site visit and cannot be judged from a description or a photo. The technician needs to see the condition of the basement walls and floor, locate any cracks and measure their length, and check whether moisture is rising from below or seeping through from the side. The choice between materials is also made on site: epoxy coating (SAR 35–90 per m²), spray foam (SAR 20–45 per m²), bitumen membrane (SAR 15–35 per m²) and XPS boards (SAR 12–30 per m²) each suit different surfaces and different water conditions. If the duplex has a bathroom above the basement or a water tank nearby, those are inspected too, since bathroom waterproofing runs SAR 15–40 per m² and tank internal coating SAR 25–60 per m². Roof work is judged separately, with liquid roof waterproofing at SAR 8–25 per m².

To help the technician prepare, the household should note any past leaks, the months when damp appears most, and whether the basement is used for storage, a living area or both. Clear access to the walls and floor, and to the roof and any tank, saves time on the visit. Photographs of visible cracks and stains, taken with a rough sense of their position, are useful too. Keeping the basement dry before the work begins, by moving stored items off the floor, lets the technician see the true condition of the surfaces rather than a damp, covered version of them.

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

When do you need basement & foundation waterproofing?

If you notice one of these signs in Alaridah, 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.
• Rainwater draining towards the foundation — we check this before anything else.
• A high groundwater level — we check this before anything else.

Tools we use in Alaridah

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.

Alaridah in facts and sources

Common questions about basement & foundation waterproofing in Alaridah

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.