Water tank waterproofing for apartments in Afif

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

Why water tank waterproofing differs in Afif

The centre of Afif sits about 1040 m above sea level (SRTM open elevation data). Main roads in or near Afif: King Abdulaziz Road, King Faisal Road, Airport Road.

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..

Water tank waterproofing in apartment buildings in Afif usually starts with leaks at the tank's internal joints, floor-to-wall junctions and cracks where the concrete has moved over time. Residents often notice damp patches on the ceiling below the roof, or water staining on the stairwell wall, long before the tank itself looks damaged. For apartment blocks, the tank is shared, so a leak affects several households and the repair needs to be planned around the building's water supply.

Afif sits at a high altitude, with the centre about 1040 m above sea level, and that changes how we approach the job. Cooler nights and larger day-to-night temperature swings place more stress on concrete and on the sealing materials applied to it, so we pay close attention to how the existing surface has cracked and expanded. Where a tank has hairline or structural cracks, crack injection is typically priced at SAR 40–120 per metre, and it is often the first step before any surface coating goes on. For the internal lining, tank internal coating is priced at SAR 25–60 per m², and epoxy coating at SAR 35–90 per m², with the choice depending on the condition of the concrete and the water quality the tank holds. Liquid roof waterproofing, at SAR 8–25 per m², or a bitumen membrane at SAR 15–35 per m², may be used on the roof slab above the tank, where the apartments below are most exposed.

Before the visit, ask the provider whether they will inspect the tank from inside as well as the roof, and whether they will drain and clean it before work begins. Ask which materials they propose and why, and request the price per square metre for each item so you can compare it with the ranges above. Check whether the quote covers crack injection separately, and whether the building's management or the other households need to be informed about water shut-offs. Finally, ask how long the repair will keep the tank out of use, and what the provider will do if the leak returns in the same spot.

In apartment buildings, the floor below is often where a leak shows first.

Signs that call for water tank waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

• Damaged old coating.
• Cracks in the walls or floor.
• Construction joints.

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

Common questions about water tank waterproofing in Afif

What we advise against

• Using a material that is not intended for drinking water

What you receive

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.