Water tank waterproofing for residential buildings in Aljumum

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

What is specific about Aljumum for water tank waterproofing

Team note on Aljumum: 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 Aljumum sits about 200 m above sea level (SRTM open elevation data).

Water tanks on residential roofs in Aljumum face a common problem: slow seepage through cracked walls and failed joints, which often shows up first as damp patches on ceilings below. Because the tank sits in direct sun and cycles between hot and cool temperatures, hairline cracks tend to open over time, and a tank that looks sound from the outside can still be losing water through its base or corners. Early signs include a tank that needs topping up faster than usual, a musty smell in the storage room, or staining on the wall beneath the tank.

The location changes how we approach the job. The centre of Aljumum sits about 200 m above sea level, which means the local climate and ground conditions are shaped by a higher, drier setting than coastal areas. Our approach for tanks in this area starts with a full inspection of the internal surfaces and any visible cracks before choosing a method. For tank internal coating, the cost usually falls in the range of SAR 25–60 per m², and for smaller repairs, crack injection is priced at SAR 40–120 per metre. Where the tank is leaking mainly through joints, the right fix may be a targeted repair rather than a full recoating.

Before the visit, it helps to have a few details ready. Note the size of the tank and whether it is a concrete, fibreglass, or steel unit, and describe any leaks you have seen, including where and when they appear. Let us know whether the tank is on the roof or at ground level, and whether there has been earlier waterproofing work. Ask for a written quote that lists the area to be treated and the rate per m² so you can compare it with the ranges above. Clear information at the start makes the inspection quicker and the recommendation more accurate.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

Signs worth paying attention to

If you notice one of these signs in Aljumum, it is a good moment to talk to the team:

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

Causes we see in the field

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

Tools and methods, and when we use them

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 — Aljumum

Questions from Aljumum

Common mistakes we see

• Using a material that is not intended for drinking water

The written outputs

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.