Water tank waterproofing for duplexes in Afif

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

What is specific about Afif for water tank waterproofing

Team note on Afif: 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.. Main roads in or near Afif: King Abdulaziz Road, King Faisal Road, Airport Road.

The centre of Afif sits about 1040 m above sea level (SRTM open elevation data).

Picture a family who owns a duplex in Afif, with the upper floor rented to another household and a rooftop water tank that has started to leak. The owner notices damp patches on the ceiling below, a faint smell in the stairwell, and a tank that seems to refill more often than it should. They want the problem fixed properly, but they are unsure whether the tank, the roof, or the bathroom is to blame, and they want a clear idea of the cost before anyone starts work.

Afif sits at roughly 1040 m above sea level, which matters more than it might seem. At that height, the air is cooler than in the lowlands, but the sun is strong and the daily temperature swings can be sharp. Metal and concrete expand and contract with these changes, so small hairline cracks in a tank wall or roof screed tend to open up over time. For a duplex owner, this means a tank that looked sound last year may already be letting water through at a joint or corner. Checking the tank and roof regularly is a sensible habit, and any repair is more economical when done early, before moisture spreads into the walls of the upper unit.

Start by emptying the tank and inspecting the inside for cracks, flaking, and joints that have separated, marking each problem area so nothing is missed. Next, check the roof surface around the tank base and the bathroom wet areas, since leaks often travel along the structure before showing up. Clean and dry every surface thoroughly before any product is applied, because coatings will not bond to damp or dusty concrete. Seal active cracks first using crack injection, then treat the tank interior with a suitable coating, and finish the roof with a liquid or membrane system matched to the existing surface. Allow each layer to cure fully before refilling or walking on it, and keep a simple record of what was done and when, so future maintenance is easier to plan.

In a duplex, the two floors often share lines, so tests are done floor by floor.

Signs worth paying attention to

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

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

The most common causes

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

Tools we use in Afif

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.

Facts and costs — Afif

Short answers for Afif

Common mistakes we see

• Using a material that is not intended for drinking water

The written outputs

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