Basement & foundation waterproofing for apartments in Alaridah

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

Before we start: what we know about Alaridah

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

Before any materials are discussed, the first thing checked in Alaridah is the height of the ground itself. The centre of Alaridah sits about 2591 m above sea level, according to SRTM open elevation data, which means the site is high and the drainage pattern of the surrounding slopes shapes how water reaches a basement wall. Because of this, the technician looks first at where rainwater would run toward the building, whether the basement is cut into a slope, and whether any retaining or drainage path already exists. Basement waterproofing is priced at SAR 50–150 per m², so getting the water route right at the start matters more than choosing a finish in a hurry. Crack injection, priced at SAR 40–120 per metre, is only relevant once the source of seepage has been traced to a specific line in the wall or slab.

Several things are left to the site visit, because they cannot be judged from a description. These include the moisture reading at each wall, the condition of the existing membrane or tanking where it is visible, the position and width of any cracks, and whether the surface is damp from rising ground moisture or from water entering through the wall. The technician will also decide whether a bathroom above the basement needs its own treatment, since bathroom waterproofing is priced separately at SAR 15–40 per m², and whether the roof above a shared stairwell needs liquid roof waterproofing at SAR 8–25 per m². Choices such as epoxy coating at SAR 35–90 per m², spray foam at SAR 20–45 per m², or a bitumen membrane at SAR 15–35 per m² depend on these findings, not on a fixed rule.

To help the technician prepare, residents should note when damp appears, whether it follows heavy rain or stays constant, and which walls feel cold or show staining. Access matters: the basement should be clear of stored items, and any previous repair records or invoices are useful. If the building has a water tank in the basement or on the roof, mention it, because tank internal coating is priced at SAR 25–60 per m² and is handled as a separate job. Insulation for cold surfaces, where needed, may involve XPS boards at SAR 12–30 per m². Clear notes on these points let the visit move straight to measurement and a sound plan for the apartment building.

In an apartment, a problem may start in your unit or in a shared line; we separate the two before any work.

Signs worth paying attention to

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

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

Where the problem usually comes from

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

How we choose the tool in Alaridah

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.

Facts and costs — Alaridah

Questions from Alaridah

Common mistakes we see

• Painting the basement wall while the water comes from outside

What you get after the work

You receive: the source, the treatment and the follow-up result, in a technical report with a verification code.