Water tank waterproofing for residential buildings in Afif

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

Water tank waterproofing in Afif: the local context

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).

Water tanks on residential roofs in Afif are a common source of leaks, and the most frequent problem is seepage through the tank walls and floor where concrete has cracked or where old coatings have lifted. Because the tank sits above the building and is refilled regularly, even a small crack can release water into ceilings and walls below before the owner notices any damage. Many households only realise there is a problem when stains appear on the top floor, which is why an inspection of the tank interior is usually the first step.

Afif is located in the highlands, with the centre of the town sitting about 1040 m above sea level. At this altitude, residents can see wide temperature swings between day and night, and those changes make the concrete expand and contract, which encourages hairline cracks over time. For that reason, a tank repair here often starts with crack injection, priced at SAR 40–120 per metre, to seal the joints and cracks before any surface treatment is applied. Tank internal coating, at SAR 25–60 per m², then provides a continuous protective layer on the walls and floor, and it is usually paired with the sealing work rather than used alone. Where the tank lid or the roof slab beneath it is also leaking, liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² may be considered for the surrounding area.

Before booking a visit, ask the contractor to inspect the tank from inside and to explain which cracks they plan to inject and which surfaces they will coat. Confirm the measured area in square metres so you can check the quote against the per-m² rates above. Ask whether the work includes preparing the surface and how long the tank must stay empty afterwards, and request a written breakdown of the crack injection length and coating area. Finally, ask which materials they intend to use so that the coating you choose suits both the water in the tank and the altitude conditions of Afif.

For a residential building, shared risers, tanks and pumps are checked as one system.

Signs that call for water tank waterproofing

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

Where the problem usually comes from

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

Tools and methods, and when we use them

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 Afif

Questions from Afif

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.