Water tank waterproofing for duplexes in Aldiriyah

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

What is specific about Aldiriyah for water tank waterproofing

The centre of Aldiriyah sits about 655 m above sea level (SRTM open elevation data). Team note on Aldiriyah: 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 most common problem we see with water tanks on duplexes in Aldiriyah is a slow leak through the tank walls and floor that shows up first as damp patches in the ceiling below, long before anyone sees water on the roof. Because the tank sits on the roof and feeds both units, a leak affects two households and is easy to misread as a roof leak. A tank that has been in service for several years often shows hairline cracks at the joints and corners, where the concrete has worked over time. Left alone, these cracks let water seep into the structure and keep the concrete damp, which speeds up wear.

Local conditions change how we approach the job. The centre of Aldiriyah sits about 655 m above sea level (SRTM open elevation data), so it is a higher-elevation site where the sun and dry air work hard on exposed roof surfaces, and that heat cycle is one reason surface coatings on the tank exterior can crack. Our approach for a duplex tank therefore starts with the tank interior, where the water is held, and then deals with the roof area around it. Crack injection is priced at SAR 40–120 per metre, and tank internal coating at SAR 25–60 per m², so the work is usually split between sealing the visible cracks and coating the inside. Liquid roof waterproofing, at SAR 8–25 per m², is then applied to the roof surface beneath and around the tank so that the two units are protected together.

Before the visit, ask the provider to confirm which part of the tank they will inspect, whether they will drain it and clean it before measuring, and how they will measure the area so the quote matches the work. Ask which materials they plan to use and whether the price range covers both the interior coating and the roof work. Ask who will be on site and how long the work is expected to disrupt water supply to each unit, so that both households can plan. Keep these questions in writing so the scope is clear before any work begins.

In a duplex, the two floors often share lines, so tests are done floor by floor.

Signs that call for water tank waterproofing

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

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

Causes we see in the field

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

Tools we use in Aldiriyah

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.

Quick comparison: facts and costs in Aldiriyah

Questions from Aldiriyah

Common mistakes we see

• 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.