Water tank waterproofing in Alzulfi: 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 Alzulfi

The centre of Alzulfi sits about 615 m above sea level (SRTM open elevation data). Main roads in or near Alzulfi: King Fahd Road, Sheikh Ibn Baz Square, King Salman Road.

Team note on Alzulfi: 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 Alzulfi sits about 615 m above sea level, which places the town in the Najd highlands rather than on the coastal plain. For water tank waterproofing, altitude matters because the air is often drier and temperature swings between day and night can be wide. Those swings cause concrete and coatings to expand and contract, so hairline cracks tend to appear in tank walls and roof slabs over time. A technician who knows this will check for movement lines first, rather than only testing for leaks at the surface.

Each part of a tank reacts differently to these conditions, and the work is priced by area or length. Tank internal coating is quoted at SAR 25–60 per m², which is the usual route for a tank that has started to lose water through its walls. Where cracks are the problem, crack injection is charged at SAR 40–120 per metre, so a short, sealed line can cost less than resurfacing the whole tank. Liquid roof waterproofing at SAR 8–25 per m² and bitumen membrane at SAR 15–35 per m² suit rooftop tanks that are exposed to sun and rain. Because the roof surface takes the most heat, owners should ask for a sealing system that suits strong sunlight and not only one chosen for price.

Owners in Alzulfi can avoid several common mistakes. The first is waiting until the water level keeps dropping before calling anyone, when a small crack has already spread. The second is painting over damp concrete, which traps moisture and makes the coating peel within months. The third is choosing the lowest per-metre rate without asking what the quote includes, since surface preparation affects the result. The fourth is ignoring the tank lid and inlet seals, which let dust and insects in even when the walls are sound. Asking the technician to inspect the whole tank, and to explain which cracks need injection and which need full coating, helps owners pay only for the work the tank actually needs.

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

Causes we see in the field

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

How we choose the tool in Alzulfi

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 Alzulfi

Questions from Alzulfi

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.