Water tank waterproofing in Unaizah: cost & published offers

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

What is specific about Unaizah for water tank waterproofing

Team note on Unaizah: 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.. The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data).

Water tank waterproofing in Unaizah most often begins with leaks at the seams where the tank walls meet the base and at hairline cracks in the concrete. Over time, water works through these weak points, stains the outer walls, and can compromise the structure. Because a tank is always either full or partly full, the lining sits under constant water pressure, which is why small cracks that look harmless tend to widen. Before choosing a method, it helps to know exactly where the water is getting in.

Local conditions shape how the work should be approached. The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data), so the town is elevated above much of the surrounding land. Tanks here are often fed and drained on a regular cycle, and that repeated filling creates movement and wetting and drying of the concrete. For tank interiors, a tank internal coating is priced at SAR 25–55 per m², and an epoxy coating is priced at SAR 35–85 per m². Where cracks are the main issue, crack injection is priced at SAR 40–115 per metre, which allows the crack to be sealed from within before the surface is treated. For the tank's exterior or the roof above it, a liquid roof waterproofing system at SAR 10–25 per m² or a bitumen membrane at SAR 15–35 per m² may suit the job, while XPS boards at SAR 10–30 per m² can serve as insulation and protection where the setup calls for it.

Before the visit, ask the provider to confirm which part of the tank they will treat and how they will identify the source of the leak. Ask whether the quote is per m² or per metre, and what area or length they have measured, so you can compare it fairly with the published ranges. Clarify whether surface preparation, crack injection, and the chosen coating are included in one figure or charged separately. Ask how long the tank must stay empty for the coating to cure, and whether the work will be inspected once complete. Written answers to these questions will make the quote easier to judge than a verbal estimate.

Prices shown on this page come from our own published price list for the city; the final price is set after inspection.

Signs worth paying attention to

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

The most common causes

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

How we choose the tool in Unaizah

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.

Quick comparison: facts and costs in Unaizah

Questions from Unaizah

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.