Water tank waterproofing for villas in Afif

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

Why water tank waterproofing differs in Afif

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).

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..

Picture a villa owner in Afif who has a rooftop water tank that feeds the household supply. Over a few seasons they notice damp patches on the ceiling below, a faint smell in the water, and a tank lid that no longer sits quite flat. They want the tank sealed properly before the problem reaches the bedrooms, but they are unsure whether the work should cover the tank walls, the base, or only the outside, and they want a sense of what the job roughly costs before calling anyone.

Afif sits at about 1040 m above sea level, which is a high, cool location in the Asir region of the Kingdom. For a villa owner, the elevation means the town can see more temperature swings between day and night than coastal cities, and the materials on an exposed rooftop are asked to flex with those changes. A tank that is inspected only when it starts leaking may already have hairline cracks in its concrete or coating. Because the site is elevated, the owner should also think about how the tank is exposed to wind and sun, since both affect how long a coating lasts. The practical lesson is to treat the tank as part of the roof system rather than a separate container.

The sensible sequence starts with emptying and cleaning the tank, then inspecting the walls, base and joints for cracks and failed sealant. Any crack should be treated first, and crack injection is priced at SAR 40–120 per metre, so measuring the total crack length helps set a realistic budget. Next, the owner can choose an internal lining. Tank internal coating runs at SAR 25–60 per m², and epoxy coating at SAR 35–90 per m² is a common alternative when the surface needs a harder finish. Where the tank sits on the roof, the surrounding area can be treated with liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m². Finally, the owner should let the work cure fully, refill the tank, and check it again after the first few weeks for any new damp or seepage.

Villas often have several lines and tanks; we test them one at a time so the cause is clear.

Signs that call for water tank waterproofing

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

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

The most common causes

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

How we choose the tool in Afif

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.

Afif in facts and sources

Questions from Afif

What we advise against

• 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.