Water tank waterproofing for duplexes in Alrass

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

Water tank waterproofing in Alrass: the local context

Team note on Alrass: 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 Alrass sits about 695 m above sea level (SRTM open elevation data).

Main roads in or near Alrass: King Abdulaziz Road, King Fahd Road, King Salman Road.

The first thing checked on a water tank job in Alrass is the elevation, because the centre of Alrass sits about 695 m above sea level (SRTM open elevation data). At that height the ground and the structures built on it are exposed to a drier, more open climate than coastal areas, and the rooftop tank is usually the main reservoir for a duplex. Before any product is chosen, the technician confirms whether the tank is set on the roof, at ground level or inside a basement, since each position changes the load, the sun exposure and the likely route water takes into the structure. The price range for the work follows from that inspection, so the first quote reflects what is actually found rather than a generic estimate.

Several things are left to the site visit and cannot be settled from a description alone. The technician looks at the tank's internal surface for cracks, flaking or staining and tests whether the leak comes from the base, the walls or a joint. Roof areas are walked to find ponding, cracked screed and failed sealant around the tank stand. Where the tank sits over living space, the technician checks the ceiling below for damp patches and decides whether crack injection, a liquid roof layer or a bitumen membrane is the right repair. Measurements are taken on site, because the area in square metres and the length of any cracks in metres determine the final figure within the ranges listed for each method.

Some details help the technician prepare before arriving. It is useful to know the age of the tank, the material it is made from, and when the leak was first noticed and whether it worsens after filling. Access to the roof, the stairwell and any basement should be arranged in advance, and the owner should note whether the duplex is occupied during the work, since surface preparation and curing times affect when the tank can be refilled. Photographs of the tank interior and the ceiling below, taken before the job starts, give a useful baseline. With this information, the technician can match the right method to the site, from spray foam and epoxy coating to XPS boards, and explain clearly what each option costs per square metre.

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

When do you need 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

Where the problem usually comes from

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

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.

Alrass in facts and sources

Common questions about water tank waterproofing in Alrass

Common mistakes we see

• Using a material that is not intended for drinking water

What you get after the work

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.