Water tank waterproofing for residential buildings in Al Rbwa, Riyadh

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

Water tank waterproofing in Al Rbwa: the local context

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 approximate area shown on the map is centred here. Main roads in or near Al Rbwa: Eastern Ring Road, Makkah Road, Kharis Road.

The centre of Al Rbwa sits about 639 m above sea level (SRTM open elevation data).

Do water tanks on residential roofs in Al Rbwa need waterproofing, and how do you know when it is due? Al Rbwa sits at the coordinates 24.6934, 46.7589, about 8.7 km from the centre of Riyadh, with an approximate radius of 3.3 km, so it is a close neighbour of the capital and shares its hot, dry climate. The centre of the area sits about 639 m above sea level. For a residential building, the tank is often the one structure that holds water constantly, so any seepage through its walls or base is worth catching early. Tank internal coating is priced at SAR 25–65 per m², and it is one of the services we quote for this kind of job, alongside bitumen membrane at SAR 15–35 per m² for roof-level protection.

The inspection starts with a walk around the tank and a look at the surfaces that face the water. We check for cracks, flaking or soft patches on the inner walls and base, and we look at the outer walls and the roof slab for damp marks or staining. Where cracks are present, we measure their length, since crack injection is charged per metre at SAR 40–125 per m. We also check the roof area around the tank, because liquid roof waterproofing at SAR 10–25 per m² and spray foam at SAR 20–45 per m² are often needed where water collects. The inspection ends with a short written summary of what we found and which parts of the tank, and which surfaces, the proposed work would cover.

Before the visit, it helps to have a few things ready. Note when you first noticed damp, low water levels that do not match usage, or any staining on ceilings below the tank. Clear access to the tank lid and the roof area so the team can work without delay. If the tank has been drained recently, tell us, because a dry tank shows cracks more clearly. Keep any past service records or invoices, since they show what has already been done. With this information, the visit can focus on the real problem, and you will receive a clear, fact-based picture of what the work involves before you decide on anything.

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

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:

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

The most common causes

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

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 Rbwa

Short answers for Al Rbwa

What we advise against

• 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.