Water tank waterproofing for schools in Sabya

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

Before we start: what we know about Sabya

Main roads in or near Sabya: King Fahd Road, King Abdulaziz Road, King Abdullah bin Abdulaziz Road. Team note on Sabya: 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..

Sabya is about 16.7 km from the sea coast (OpenStreetMap). The centre of Sabya sits about 40 m above sea level (SRTM open elevation data).

For schools in Sabya, the most common problem with water tank waterproofing is slow seepage through the tank walls and floor joints, often noticed as damp patches on the outside or a faint taste and discolouration in stored water. Because school tanks are usually large and used heavily during the day and then left idle over weekends and holidays, small leaks can go unnoticed for long periods and then worsen quickly when the tank is refilled. Tank internal coating is often the first repair considered, typically priced between SAR 25–60 per m², while crack injection, at SAR 40–120 per m, is used where a specific crack is the source.

Local conditions shape the approach. The centre of Sabya sits about 40 m above sea level, and the town is about 16.7 km from the sea coast. That means the work is not affected by salt-laden coastal air in the way that buildings closer to the shore are, so the focus can stay on the tank structure and the coating system itself rather than on extra corrosion protection. The inland location also means the tank is typically exposed to heat and dust rather than humidity from the sea, so the surface preparation and the choice of a coating that stays flexible through temperature swings deserve close attention. Where a school also has rooftop tanks, liquid roof waterproofing (SAR 8–25 per m²) or a bitumen membrane (SAR 15–35 per m²) may be considered for the roof surface beneath them.

Before the visit, ask the provider which tank surfaces they propose to treat and whether the price covers preparation, not just the coating. Ask whether they will inspect for cracks and how those will be priced, since crack injection is charged per metre. Confirm the timing of the work so that water supply to classrooms and washrooms can be planned around it, and ask how the tank will be drained, cleaned and tested before it is returned to use. Finally, request a written description of the materials proposed so the school can compare them with the options listed above.

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

Signs that call for water tank waterproofing

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

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

Where the problem usually comes from

• Construction joints.
• Cracks in the walls or floor — we check this before anything else.
• Damaged old coating — we check this before anything else.

How we choose the tool in Sabya

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 Sabya

Questions from Sabya

Mistakes that cost more

• Using a material that is not intended for drinking water

What you receive

The written output: the material name, its batch number and the fill-test result. The report is numbered and can be checked with its verification code.