Water tank waterproofing for residential buildings in Khafji

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

Before we start: what we know about Khafji

The centre of Khafji sits about 9 m above sea level (SRTM open elevation data). Khafji is about 2 km from the sea coast (OpenStreetMap).

Team note on Khafji: 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.. Main roads in or near Khafji: King Abdullah Road.

Khafji is a coastal town in the Eastern Province, with its centre sitting about 9 m above sea level and roughly 2 km from the sea coast. Its low elevation and nearness to the water mean that the air is humid and salt-laden, and the ground around many homes can hold moisture for longer than inland areas do. For a water tank, these conditions matter because salt in the air and damp surroundings speed up corrosion of exposed metal and weaken concrete surfaces over time. Owners here should expect that a tank can be attacked from outside as well as from the water it holds.

Because the centre is only about 9 m above sea level, rainwater and groundwater do not drain away quickly, so tank walls and bases can stay damp for extended periods. Proper waterproofing and a sound internal coating keep that moisture from seeping through cracks and joints into the stored water. The proximity to the coast, about 2 km, means that salt spray and humidity reach buildings regularly, which is why a coating that resists chemical attack and moisture is preferred over a basic surface treatment. Crack injection, priced at SAR 40–120 per metre, is often needed in older tanks where small movements have opened paths for water, while tank internal coating, at SAR 25–60 per m², creates a continuous barrier across the surfaces that touch drinking water.

Owners in Khafji often avoid several common mistakes. They do not ignore small cracks, since a hairline fault can widen with every season of damp and salt exposure. They do not rely on a single cheap surface layer when the tank walls or base need a combined approach, such as XPS boards at SAR 12–30 per m² beneath a membrane. They also do not treat the roof and the tank as separate jobs, because leaks from a rooftop can reach the stored water. Comparing the scope and per-square-metre rates across each element helps owners plan a complete job rather than a partial one.

For a residential building, shared risers, tanks and pumps are checked as one system.

When do you need water tank waterproofing?

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

• A tank that leaks after testing
• Deposits and flaking inside the tank
• Unusual colour or taste in the water

Where the problem usually comes from

• Damaged old coating.
• A common cause: cracks in the walls or floor.
• Construction joints — we check this before anything else.

Tools we use in Khafji

From the first visit to the report

1. Emptying and ventilation: The tank is emptied and ventilated before entry.
2. Cleaning and preparation: Loose material is removed down to a sound surface.
3. Crack treatment: Active cracks are treated first.
4. Coating layers: A material intended for drinking-water tanks is applied.
5. Disinfection and fill test: The tank is disinfected and the level is monitored after filling.

Quick comparison: facts and costs in Khafji

Short answers for Khafji

Common mistakes we see

• Using a material that is not intended for drinking water

What you get after the work

You receive: the material name, its batch number and the fill-test result, in a technical report with a verification code.