Water tank waterproofing in Aljumum: before buying or handover

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

Before we start: what we know about Aljumum

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).

The most common problem with water tanks in Aljumum is seepage through cracks and failed internal coatings, which often goes unnoticed until the tank is refilled and the water quality or pressure drops. Before buying a property or taking handover, look closely at the tank's interior walls, base and joints, and check for flaking paint, white mineral deposits, damp patches on the outside, or a musty smell in the storage area. Tank internal coating typically costs SAR 25–60 per m², while crack injection is priced at SAR 40–120 per metre, so small defects can be fixed affordably if they are found early.

Aljumum's location matters here. The centre of Aljumum sits about 200 m above sea level (SRTM open elevation data), which means the area has a different exposure profile than low-lying coastal districts. Water pressure in rooftop and elevated tanks depends on height, and the tank may be fed and emptied more often in a hilltop setting. That makes it worth checking whether the tank has been coated with a product suited to frequent cycling, and whether the inlet and outlet fittings show signs of stress or leakage. Where the tank sits on a roof, liquid roof waterproofing at SAR 8–25 per m² and bitumen membrane at SAR 15–35 per m² are common options, so ask which system was used and when it was last inspected.

Before the visit, ask the seller or landlord for the date of the last tank cleaning and any coating or repair records, and ask whether the tank has ever been drained for inspection. Request access to the tank itself rather than relying on a verbal description, and ask for the approximate tank capacity so you can compare any quoted work fairly. Find out whether the building has an XPS insulation layer or a spray foam finish on the roof, since these affect both the price and the method of any future repair. Clear answers to these questions will help you decide whether the tank needs work before you buy or move in.

Before buying or taking over a property, an inspection gives you findings in writing before you sign.

Signs that call for water tank waterproofing

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

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

Where the problem usually comes from

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

How we choose the tool in Aljumum

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 Aljumum

Common questions about water tank waterproofing in 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.