Basement & foundation waterproofing for schools in Alrass

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

Basement & foundation waterproofing in Alrass: the local context

Main roads in or near Alrass: King Abdulaziz Road, King Fahd Road, King Salman Road. The centre of Alrass sits about 695 m above sea level (SRTM open elevation data).

Team note on Alrass: 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..

The most common problem with basement and foundation waterproofing in schools is water tracking in through hairline cracks and cold joints in the lower walls and slab, usually after rain or when groundwater rises during the wet season. Because schools use these spaces for storage, plant rooms and sometimes activity areas, even a small seep can damage equipment, encourage mould and stain finishes that parents and staff see every day. Problems often show first as damp patches at the base of walls or along the joint where wall meets floor, rather than as a sudden flood.

In Alrass, the centre of the town sits about 695 m above sea level, so site drainage and the way water moves across the plot deserve careful attention before any membrane is chosen. A basement at this elevation is still below ground and must resist moisture from the surrounding soil, so the work normally starts with locating and sealing cracks, then choosing a system suited to the wall and slab condition. Crack injection is priced per metre, typically SAR 40–120 per m, and is often the first step where cracks are the main route for water. Where the whole wall face needs protection, basement waterproofing is priced per m², typically SAR 50–150 per m², and an epoxy coating, typically SAR 35–90 per m², may be considered for interior finishing in wet-use rooms. For the roof above, liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² can be compared against the school's budget and access during term time.

Before the visit, ask the school for the dates of past leaks, the areas affected, any records of groundwater or drainage works, and whether basement rooms are in use during the work. Ask which rooms hold equipment that must be moved, and whether work can be scheduled around exams and holidays. Confirm who will inspect cracks and joints first, how the quote breaks down by m² and by metre, and what preparation the school must complete before the team arrives.

For schools, the larger jobs are planned for weekends and holidays.

When do you need basement & foundation waterproofing?

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

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

Causes we see in the field

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

How we choose the tool in Alrass

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 — Alrass

Questions from Alrass

Common mistakes we see

• Painting the basement wall while the water comes from outside

The written outputs

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