Water tank waterproofing in Jazan: preventive periodic check

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

Before we start: what we know about Jazan

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 is about 1.9 km from the sea coast (OpenStreetMap).

The centre of Jazan sits about 7 m above sea level (SRTM open elevation data).

Consider a homeowner in Jazan who has a rooftop water tank serving a villa with a few bathrooms and a kitchen. Nothing looks wrong most of the time, the water runs, and the tank sits quietly on the roof. Then one day a stain appears on a ceiling below, or the water tastes slightly off, and the owner realises the tank has been slowly deteriorating without anyone checking it. A periodic inspection would have caught the problem early, when repairs were smaller and cheaper.

The local setting matters here. The centre of Jazan sits about 7 m above sea level, and the city is about 1.9 km from the sea coast. That closeness to the coast means the air carries salt and humidity, which can work on coatings and metal fittings over time, so the outside of the tank and its supports deserve attention as well as the inside. Because the city is low-lying and close to the water, owners should not assume that a tank which looked sound last year is still sound now. Regular checks keep track of changes that a casual glance will miss.

A practical routine starts with turning off the supply and draining the tank so the inside can be seen clearly. Look for cracks, flaking coating, staining, and any gaps at the corners and joints, and mark any suspect spot so it can be checked again. Next, inspect the top, sides and supports for rust, salt crust or loose seals, and check that the lid fits tightly to keep out dust and insects. Then clean the interior, rinse thoroughly, and let it dry before refilling. If you find a hairline crack, note its length, since crack injection is priced per metre and small cracks are far easier to seal than large ones. For the inside surface, a tank internal coating is priced per m², so recording the extent of any damage helps you compare options before you agree to any work. Finally, keep a simple written log of each inspection date and what you found, so the next check shows clearly whether a problem is growing.

Preventive checks follow a written schedule instead of waiting for a fault.

Signs worth paying attention to

The following signs are worth checking before they grow:

• Unusual colour or taste in the water
• Deposits and flaking inside the tank
• A tank that leaks after testing

The most common causes

• Construction joints — we check this before anything else.
• A common cause: cracks in the walls or floor.
• Damaged old coating — we check this before anything else.

How we choose the tool in Jazan

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

Short answers for Jazan

What we advise against

• Using a material that is not intended for drinking water

The written outputs

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.