Basement & foundation waterproofing for schools in Alzulfi

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

Before we start: what we know about Alzulfi

Main roads in or near Alzulfi: King Fahd Road, Sheikh Ibn Baz Square, King Salman Road. The centre of Alzulfi sits about 615 m above sea level (SRTM open elevation data).

Team note on Alzulfi: 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 are the most common problem we see in school buildings in Alzulfi. Ground-floor storerooms, plant rooms and lower corridors often hold water after rain because wall and slab joints were never fully sealed, and cracks in the foundation let moisture track through to the interior. Left alone, this leads to damp patches, peeling finishes, and mould in spaces where students and staff spend long hours.

Alzulfi's location changes how we approach the work. The centre of town sits about 615 m above sea level, which places it in the highland region rather than on the coastal plain. Rainfall here tends to arrive in short, heavy bursts that run off sloping ground toward low points, so ground-level and basement walls can take sudden pressure. For this reason we start by checking drainage paths around the building before choosing a system. Crack injection is typically priced at SAR 40–120 per metre, and epoxy coating at SAR 35–90 per m², so the mix of repairs depends on how many cracks we find and how much surface needs protection. Basement waterproofing itself is quoted at SAR 50–150 per m², and in school basements we often combine it with XPS boards at SAR 12–30 per m² where insulation and moisture control are both needed.

Before the visit, ask the provider a few clear questions. Ask which parts of the basement and foundation they plan to inspect, and whether they will check the surrounding ground and gutters as well as the interior walls. Ask how they will price the work: per m² for coated areas and per metre for cracks, so you can compare quotes fairly. Ask what preparation the school must do, such as clearing storerooms and planning access around term times. Finally, ask how the site will be left once the work is complete, including who will check the repaired areas after the next rainy period.

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

Signs worth paying attention to

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

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

Causes we see in the field

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

Tools we use in Alzulfi

How the work is done, step by step

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 Alzulfi

Short answers for Alzulfi

What we advise against

• 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.