Water tank waterproofing in Al Mrwj, Riyadh: cost & published offers

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

Water tank waterproofing in Al Mrwj: the local context

The centre of Al Mrwj is at 24.7578, 46.6637, about 5 km from the centre of Riyadh, with an approximate radius of 2.1 km. The approximate area shown on the map is centred here. Al Mrwj has both villas and apartment buildings.

The centre of Al Mrwj sits about 635 m above sea level (SRTM open elevation data). Main roads in or near Al Mrwj: King Fahd Road, Northern Ring Road, King Abdulaziz Road.

The nearest wadi channel is about 2.8 km from the centre of Al Mrwj (OpenStreetMap).

Water tank waterproofing in Al Mrwj is most often needed because of seepage at the joints and corners of concrete tanks, which lets water escape and can weaken the surrounding structure over time. Villas usually have rooftop or ground-level tanks that are exposed to strong sun and heat, which speeds up cracking in the coating. Apartment buildings often share a larger tank, so a leak there can affect several households at once. In both cases the first step is a careful inspection of the inner walls, floor and seams before any material is chosen.

Local conditions shape the approach. The centre of Al Mrwj sits about 635 m above sea level, and the nearest wadi channel is about 2.8 km from the centre of Al Mrwj, so sudden rain runoff and dust can both affect external tank surfaces and the roof area around them. The centre of Al Mrwj is at 24.7578, 46.6637, about 5 km from the centre of Riyadh, with an approximate radius of 2.1 km, meaning most properties here are in a compact residential zone where access and delivery of materials are generally straightforward. Because Al Mrwj has both villas and apartment buildings, a technician should adjust the method to the tank size and access point. Tank internal coating is priced from SAR 25–65 per m², while liquid roof waterproofing is priced from SAR 10–25 per m², and the right choice depends on whether the leak is inside the tank or on the surface above it.

Before the visit, ask the provider to confirm which service applies to your tank and what area it will cover, so you can compare quotes using the published ranges. Ask whether the price includes surface preparation, crack injection where needed (SAR 40–125 per metre), and any extra work on the roof or bathroom connected to the tank. Ask how long the inspection will take, what materials they plan to use, and whether they will show you the damage before they start. A clear written scope makes it easier to check the final cost against the published rates for Al Mrwj.

Prices shown on this page come from our own published price list for the city; the final price is set after inspection.

Signs worth paying attention to

These are the signs most often linked to water tank waterproofing:

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

The most common causes

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

Tools we use in Al Mrwj

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.

Facts and costs — Al Mrwj

Short answers for Al Mrwj

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.