Water tank waterproofing for apartments in Yanbu

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

Before we start: what we know about Yanbu

Main roads in or near Yanbu: King Abdulaziz Road, Umluj Road, Al Hanan Street. Team note on Yanbu: 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..

Yanbu is about 1.2 km from the sea coast (OpenStreetMap). The centre of Yanbu sits about 6 m above sea level (SRTM open elevation data).

Water tanks on apartment roofs in Yanbu face a constant problem: the coating inside the tank breaks down, and water seeps into the structure below. For apartment buildings, that seepage often shows up first as damp patches in the top-floor ceilings and walls, long before anyone sees water in the tank itself. The most common fix is a tank internal coating, which is priced at SAR 25–60 per m², but only when the old surface has been properly prepared and the new layer is matched to the tank material.

Local conditions shape how this work is done. The centre of Yanbu sits about 6 m above sea level, and the city is about 1.2 km from the sea coast. That closeness to the coast means the air carries salt, which can work into concrete and weaken coatings over time, so the surface prep and the choice of coating matter more here than they might inland. Because the city is so low and close to the sea, the team should check the tank walls and base for salt deposits and fine cracks before applying anything, and crack injection, priced at SAR 40–120 per metre, may be needed alongside the main coating. Where a tank sits on a roof and the roof itself leaks into the flat below, liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² may be the better route.

Before booking a visit, ask the service provider which coating they plan to use and why it suits a tank that sits close to the coast. Ask whether they will inspect for salt and cracks before quoting, and how they will prepare the old surface. Ask for the area they will measure, so you can check the per m² figures against the quote, and confirm whether crack injection is included or charged per metre. Finally, ask which part of the building the work will affect, so the residents below can be warned about access and any water shut-off needed during the job.

In apartment buildings, the floor below is often where a leak shows first.

When do you need water tank waterproofing?

These are the signs most often linked to water tank waterproofing:

• 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

• A common cause: construction joints.
• A common cause: cracks in the walls or floor.
• Damaged old coating.

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.

Yanbu in facts and sources

Short answers for Yanbu

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.