Water tank waterproofing for residential buildings in Al Wrwd, Riyadh

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

Water tank waterproofing in Al Wrwd: the local context

The centre of Al Wrwd is at 24.7244, 46.6785, about 1.2 km from the centre of Riyadh, with an approximate radius of 2 km. The service-area circle on the map below is drawn from this point. The centre of Al Wrwd sits about 631 m above sea level (SRTM open elevation data).

Main roads in or near Al Wrwd: King Fahd Road, Olaya Street, Al Urubah Road.

Picture a family who owns a mid-sized residential building in Al Wrwd. Their rooftop water tank has been in place for years, and they have started to notice damp patches on the ceiling of the top-floor flat and a faint musty smell in the stairwell. They are not sure whether the source is the roof, the tank, or the pipes, and they want to deal with it before the problem spreads to the walls below.

Al Wrwd sits at 24.7244, 46.6785, about 1.2 km from the centre of Riyadh, within an approximate radius of 2 km. Its centre is roughly 631 m above sea level. For a building owner, the closeness to Riyadh means the district is dense and well served, but it also means that work on a rooftop tank often has to be scheduled around neighbours and shared access to the roof. Waterproofing choices should reflect both the exposure of the roof and the practical limits of working in a built-up area. Pricing for each type of work varies: liquid roof waterproofing typically falls within SAR 10–25 per m², bitumen membrane within SAR 15–35 per m², and tank internal coating within SAR 25–65 per m².

Start by having the tank and the roof surface inspected together, so you know whether the leak comes from the tank walls, the base, or the roof slab underneath. Mark every crack and note its length in metres, because crack injection is priced per metre at SAR 40–125 per m and it helps to know the scope before asking for quotes. Next, empty and clean the tank, then decide on the lining: epoxy coating runs SAR 35–95 per m², while spray foam sits at SAR 20–45 per m² and can suit irregular surfaces. Where the roof itself is involved, choose between a liquid system and a bitumen membrane based on access and budget, and consider XPS boards at SAR 15–30 per m² where extra insulation is useful. Finally, ask for a written scope that lists each area, the method, and the unit rate, and confirm the tank is fully dry and cured before refilling it.

For a residential building, shared risers, tanks and pumps are checked as one system.

Signs that call for water tank waterproofing

The following signs are worth checking before they grow:

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

Where the problem usually comes from

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

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.

Facts and costs — Al Wrwd

Short answers for Al Wrwd

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.