Basement & foundation waterproofing for schools in Aljumum

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

Basement & foundation waterproofing in Aljumum: the local context

The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data). Team note on Aljumum: 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..

Basement and foundation leaks in school buildings most often show up as damp patches along the lower walls, efflorescence on the render, and hairline cracks where the floor slab meets the wall. In a school these problems are costly because classrooms, storerooms and server or lab rooms are often below ground, and a leak that is ignored over a term can spread into finishes and electrical fittings before anyone notices it. Basement waterproofing in Aljumum typically runs at SAR 50–150 per m², and crack injection at SAR 40–120 per metre, so early repair is usually far cheaper than replacement.

Aljumum sits about 200 m above sea level, so the approach here starts with understanding how water moves through the ground rather than assuming it pools from the surface. Site drainage, the slope of external ground toward the building, and the condition of gutters and downpipes from the roof all shape how much water reaches the foundation. For below-ground walls, a bitumen membrane at SAR 15–35 per m² or XPS boards at SAR 12–30 per m² may be suitable depending on access and how the wall is exposed, while epoxy coating at SAR 35–90 per m² or spray foam at SAR 20–45 per m² may suit specific surfaces. Where the building has water tanks, a tank internal coating at SAR 25–60 per m² is a separate item and should be quoted apart from the building work.

Before the visit, ask the provider to confirm which areas they will inspect, including basement walls, floor junctions, bathrooms and any roof sections that drain toward the foundation. Ask for the measured area in square metres and the length of cracks in metres, so the quote can be checked against the rates above. Ask how the site will be kept in use during work, since classrooms and offices cannot always be closed for long. Finally, ask what the written scope will cover, what materials are proposed for each surface, and whether a follow-up check is included after the first rainy season.

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

Signs that call for basement & foundation waterproofing

These are the signs most often linked to basement & foundation waterproofing:

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

The most common causes

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

How we choose the tool in Aljumum

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.

Quick comparison: facts and costs in Aljumum

Questions from Aljumum

Mistakes that cost more

• 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.