Water tank waterproofing in Qatif: before buying or handover

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

Water tank waterproofing in Qatif: the local context

The centre of Qatif sits about 5 m above sea level (SRTM open elevation data). Qatif is about 2.5 km from the sea coast (OpenStreetMap).

Team note on Qatif: 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..

Water tanks on rooftops in Qatif face a steady problem: the tank walls and floor develop hairline cracks and porous patches where water gets in and stays, and leaks often show up first as damp stains on the ceiling below rather than at the tank itself. For this property type, the tank's internal coating is usually the part that fails, so the work centres on the tank internal coating, priced at SAR 25–60 per m², rather than on the outside of the tank.

Qatif sits about 2.5 km from the sea coast, which matters because salt-laden air and humidity can speed up the breakdown of coatings and make surfaces harder to prepare. The centre of Qatif sits about 5 m above sea level, so the area is low-lying and water tends to pool and sit on roofs and around tank bases after rain. Because of this, a good approach checks the tank base, the joints, and the outlet area as well as the walls, and it treats the roof surface around the tank with liquid roof waterproofing at SAR 8–25 per m² where ponding is visible. Crack injection, at SAR 40–120 per m, can be used on active cracks before the coating goes on.

Before the visit, ask the provider which products they plan to use and whether the coating suits drinking-water tanks, since this changes the choice of material. Ask them to show where the tank is leaking, whether the tank has been drained and cleaned, and how the surface will be prepared. Request a written quote that lists each area and its rate per square metre or per metre, and ask whether the price includes repairing cracks. If you are buying or taking over a property, ask the seller when the tank was last coated and whether any repairs were made, so you know what the work will cover.

Before buying or taking over a property, an inspection gives you findings in writing before you sign.

Signs worth paying attention to

If you notice one of these signs in Qatif, 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

The most common causes

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

Tools and methods, and when we use them

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 Qatif

Questions from Qatif

What we advise against

• Using a material that is not intended for drinking water

What you get after the work

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.