Water tank waterproofing in Jazan: before buying or handover

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

Water tank waterproofing in Jazan: the local context

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..

The centre of Jazan sits about 7 m above sea level, and the city lies about 1.9 km from the sea coast. Both facts shape how water tanks behave here. A site this close to the coast and so near sea level can see humid air and salt in the surrounding environment, so tank surfaces and the coatings applied to them need to tolerate damp conditions over long periods. Because the ground is low and the coast is close, groundwater and moisture can also move toward foundations, which makes the condition of the tank base and walls worth checking before any work begins.

Practically, this means the waterproofing scope should be judged by the real exposure of the tank rather than by a generic package. Owners buying or receiving a property should ask for the internal coating and any external membrane to be inspected for blistering, lifting and salt deposits. A tank in a damp coastal setting that is coated without first being dried, cleaned and checked for cracks will tend to fail sooner, since moisture trapped under a coating is the main cause of early breakdown. Surface preparation therefore matters as much as the product chosen, and a service provider should explain how the surface will be prepared before a coat goes on.

Common mistakes owners avoid include accepting a quote that lists only a per-square-metre rate without stating the area measured, and ignoring cracks because they seem small, since a crack can carry water into the structure whatever coating sits over it. Owners also avoid comparing options on price alone: internal tank coating is priced differently from bitumen membranes or crack injection, and each suits a different defect. Finally, they check that the work is documented at handover, with the coating type, the areas treated and the points where repairs were made, so that future inspections have a clear record to follow.

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

Signs that call for water tank waterproofing

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.
• Construction joints.

Tools and methods, and when we use them

The steps in order

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

Common mistakes we see

• 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.