Water tank waterproofing in Jazan: without breaking

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

Before we start: what we know about Jazan

The centre of Jazan sits about 7 m above sea level (SRTM open elevation data). Jazan is about 1.9 km from the sea coast (OpenStreetMap).

Team note on Jazan: 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..

Can a water tank be waterproofed in Jazan without emptying the whole building or tearing out the roof? Many property owners here ask this, and the answer depends on where the tank sits and how it is built. Jazan's centre sits about 7 m above sea level (SRTM open elevation data), and the city is about 1.9 km from the sea coast (OpenStreetMap). That closeness to the coast is one reason tanks on rooftops and at ground level can face steady moisture and salt exposure, so a leak is worth dealing with early rather than waiting for stains or damp patches to spread.

The work is planned around a site inspection before any material is chosen. The technician checks the tank walls and floor for cracks, flaking, and hollow areas, and looks at the joints where the tank meets pipes or the slab. Small cracks can often be treated by injection, which is priced at SAR 40–120 per metre, while larger areas may call for an internal coating at SAR 25–60 per m². For a tank that is still in use, the inspection also confirms which products are suitable for drinking-water storage and how the surface should be prepared, since this decides whether the tank can be treated without being drained for long periods. The inspector then measures the affected area so the owner receives a clear per-square-metre or per-metre estimate.

Before the visit, it helps to gather a few things. Note when the leak was first noticed, whether it gets worse after rain or when the tank is full, and whether the damp shows on the roof, in a bathroom, or in a basement below. Have access to the roof hatch or tank lid ready, and clear the area around the tank so the technician can work safely. If you have old plans, previous repair records, or photos of the damp spots, keep them handy. Confirm with the technician how long the tank will be out of use, because that depends on the product chosen and the drying time needed before refilling. Keeping these details ready lets the visit focus on the repair itself and helps you compare the quoted options with confidence.

The aim is to locate the cause with instruments first, so any opening is limited to one point.

Signs worth paying attention to

The following signs are worth checking before they grow:

• 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 — we check this before anything else.
• A common cause: cracks in the walls or floor.
• A common cause: 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.

Jazan in facts and sources

Common questions about water tank waterproofing in Jazan

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.