Water tank waterproofing in Afif: for companies (annual contract)

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

Why water tank waterproofing differs in Afif

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).

The centre of Afif sits about 1040 m above sea level, according to SRTM open elevation data. That height places the town on the high plateau of the Najd, where the air is often drier than on the coast but temperatures can swing sharply between day and night. For a water tank, this matters in two ways. Large day-to-night temperature changes make the tank walls expand and contract, which can open hairline cracks over time. Dry conditions also dry out sealants and coatings faster, so the surface prep and curing steps must be done carefully before the tank is refilled.

Because of this, the service in Afif is planned around movement and cracking rather than only around sealing a flat surface. Crack injection is priced at SAR 40–120 per metre, and it is often the first task on an annual contract, since a single open crack can undo a full tank coating. Tank internal coating is priced at SAR 25–60 per m², and the crew checks the joints and corners for movement before applying it. Where the roof is exposed to strong sun, liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m² protects the top surface from heat-driven cracking. For tanks with insulation needs, XPS boards at SAR 12–30 per m² can reduce temperature swings that stress the structure.

Company owners on an annual contract often make a few avoidable mistakes. They wait until a leak appears before scheduling inspection, when a small crack has already spread. They treat the roof and the tank interior as separate jobs, so the roof drains onto a freshly coated surface. They choose the lowest rate per m² without checking the prep work, which is where most failures begin. They also refill the tank before the coating has fully cured, especially in dry conditions where the surface can look ready sooner than it is. A planned yearly check, with cracks sealed early and coatings renewed on schedule, keeps the tank sound and avoids emergency repairs during busy periods.

For companies, an annual contract sets the scope, the visit schedule and the reports in writing.

When do you need 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

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

Tools we use in Afif

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.

Facts and costs — Afif

Short answers for Afif

What we advise against

• 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.