Water tank waterproofing for duplexes in Al Rbwa, Riyadh

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

Before we start: what we know about Al Rbwa

The centre of Al Rbwa is at 24.6934, 46.7589, about 8.7 km from the centre of Riyadh, with an approximate radius of 3.3 km. The service-area circle on the map below is drawn from this point. The centre of Al Rbwa sits about 639 m above sea level (SRTM open elevation data).

Main roads in or near Al Rbwa: Eastern Ring Road, Makkah Road, Kharis Road.

Is it worth waterproofing the water tank on my duplex in Al Rbwa, and what will it cost? Al Rbwa's centre sits at 24.6934, 46.7589, about 8.7 km from the centre of Riyadh, within an approximate radius of 3.3 km, and it lies about 639 m above sea level. Tank internal coating is priced at SAR 25–65 per m², which is a modest sum compared with the cost of repairing water damage to the rooms and ceilings below. Duplex owners in the area often treat the tank as an out-of-sight item, but a leaking tank can soak the roof slab and the top floor, and the repair bill grows with every month the leak continues. Our page sets out what a site visit covers and what you can prepare so the visit is quick and the quote is accurate.

The inspection begins on the roof, where the technician checks the tank's external surface, the joints around the lid and the pipe penetrations, and the condition of any existing liquid roof waterproofing, which is typically priced at SAR 10–25 per m². Bitumen membranes, priced at SAR 15–35 per m², are checked for lifting edges and blistering. Inside the tank, the technician looks for cracks, flaking, and signs of past repair, and measures the internal surface to estimate the area for the tank internal coating. Where cracks are visible, crack injection is assessed at SAR 40–125 per metre. The technician also notes the bathroom and wet areas on the upper floor, since water traced from a tank leak often shows up there first, and bathroom waterproofing is priced at SAR 15–40 per m².

Before the visit, empty the tank as far as practical and make sure the roof access is clear and safe to walk. Note any damp patches, stains on ceilings, or cracks you have seen on walls and floors, and photograph them with the date. Tell the technician which roof surfaces have been repaired before and by whom, and share any previous invoices. Confirm where the water supply and electricity connections to the tank sit, and whether anyone must be present to open the building. With these details ready, the inspection can focus on the work that matters and the written quote can reflect the real area and condition of your tank.

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

Signs worth paying attention to

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

• 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 — we check this before anything else.
• A common cause: cracks in the walls or floor.

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.

Al Rbwa in facts and sources

Common questions about water tank waterproofing in Al Rbwa

Mistakes that cost more

• 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.