Water tank waterproofing in Jazan: when to call a technician

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..

Jazan sits only about 7 m above sea level near the centre, and the coast is roughly 1.9 km away, so the air is humid and salt is carried inland. For a water tank, that means the first thing a technician checks is whether the tank's inner walls and joints are showing signs of moisture that could be drawing in salt or staying damp for long periods. Dampness that lingers on the concrete, white salt deposits on the surface, and a musty smell from the tank room are the early signals that the existing coating has failed. Because the coast is close, these signs can appear sooner than they would in a drier inland city, so it is sensible to look for them during routine checks rather than waiting for a visible leak.

Many details can only be judged on site. The technician will need to see the actual condition of the tank walls, the base, the lid and any pipe penetrations, and will decide whether the old coating can be cleaned and reused or must be removed first. The depth and length of any cracks, the presence of standing water, and how the tank is supported all affect the method chosen. The technician will also confirm the size of the tank and the area to be treated, since the work is measured per square metre, and will judge whether an internal coating, an external membrane or a combination suits the structure. None of these points can be settled from a phone description, so an inspection is the only reliable way to set the scope.

To help the technician arrive prepared, note when you first noticed a problem, whether the tank has ever been emptied for cleaning, and whether any previous repairs were carried out and by whom. Take clear photographs of the inside and outside of the tank, the lid and the area around the outlet and overflow pipes, and show any cracks with a pencil mark or a ruler next to them so their length is easy to estimate. Tell the technician whether the water supply is stored in the tank for drinking or only for general use, as this affects the choice of coating. Having the tank accessible on the day of the visit, with the water level kept low where safe, will let the work begin without delay.

Some signs can be watched for a few days; others need a technician straight away — the signs list above helps you decide.

Signs worth paying attention to

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

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

How we choose the tool in Jazan

How the work is done, step by step

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 Jazan

Short answers for Jazan

Common mistakes we see

• Using a material that is not intended for drinking water

What you receive

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