Water tank waterproofing for apartments in Almajmaah

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

Water tank waterproofing in Almajmaah: the local context

Team note on Almajmaah: 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 Almajmaah sits about 720 m above sea level (SRTM open elevation data).

Main roads in or near Almajmaah: King Abdullah Road, King Fahd Road, King Salman Road.

Water tank waterproofing in apartment buildings in Almajmaah usually starts with leaks that appear slowly and are easy to miss: damp patches on the wall beside the tank, rust-coloured staining, and a tank that seems to need topping up more often than it should. In most apartment blocks the tank sits on the roof or in a shared plant area, and the concrete inside it is cracked or has lost its old coating. Water then seeps through the walls and base, and the problem spreads into the stairwell or the top-floor flats below before anyone traces it back to the tank.

Almajmaah sits at about 720 m above sea level, and that matters for how we approach the job. Higher ground in this region means strong sun and wide temperature swings between day and night, which make concrete and older coatings expand and contract. For that reason we look closely at hairline cracks and joints rather than assuming the whole surface needs replacing. Where the tank interior is sound but cracked, crack injection is priced at SAR 40–120 per metre and is often the most sensible first step. Where the inside surface is worn across a wide area, tank internal coating is priced at SAR 25–60 per m², and the choice between these depends on what the inspection finds, not on a fixed rule. The roof above the tank and the bathrooms in the flats can be treated separately, with liquid roof waterproofing at SAR 8–25 per m² and bathroom waterproofing at SAR 15–40 per m², so the work is matched to each area rather than applied uniformly.

Before booking a visit, ask the provider to confirm which parts of the system they plan to inspect, including the tank walls, base, roof slab and any shared bathrooms that drain near the tank. Ask whether they will check for leaks at the pipe connections and overflow, because these are common sources that are not solved by coating alone. It also helps to ask how the building's management will be informed of any shutdown of the water supply, since apartment tanks serve several households. Request a written estimate that lists each area and its rate per square metre or per metre, so you can see exactly what is included before any work starts.

In apartment buildings, the floor below is often where a leak shows first.

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

The most common causes

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

Tools and methods, and when we use them

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.

Almajmaah in facts and sources

Short answers for Almajmaah

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.