Water tank waterproofing for duplexes in Zhra Lbn, Riyadh

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

Before we start: what we know about Zhra Lbn

The centre of Zhra Lbn is at 24.6329, 46.5531, about 15.3 km from the centre of Riyadh, with an approximate radius of 8 km. The service-area circle on the map below is drawn from this point. The nearest wadi channel is about 1.8 km from the centre of Zhra Lbn (OpenStreetMap).

The centre of Zhra Lbn sits about 747 m above sea level (SRTM open elevation data). Main roads in or near Zhra Lbn: Western Ring Road, Najd Road, Taif.

Is a leaking water tank on a duplex in Zhra Lbn worth fixing now, or can it wait? Water that seeps through a tank wall or base rarely stops on its own, and it can soak into the slab and walls below. In Zhra Lbn, the centre sits at 24.6329, 46.5531, about 15.3 km from the centre of Riyadh, within an approximate radius of 8 km. The area lies around 747 m above sea level, and the nearest wadi channel is about 1.8 km from the centre. Those are the conditions a tank has to cope with, so a clear picture of its condition helps you decide on the right repair and its cost. Tank internal coating is priced at SAR 25–65 per m², and that figure is the one most owners compare against a full replacement.

Before any work starts, the inspection looks at the tank's internal surfaces, the base, the joints and any visible cracks, plus the roof and the area around the supply and outlet pipes. Where cracks are present, crack injection is priced at SAR 40–125 per metre, so the technician measures the length of each crack and notes its position. The inspection also checks the wall surfaces for flaking, blistering or damp patches, and records which surfaces need a coating and which need an injection repair. The findings are then matched to the right material, whether that is a tank internal coating, an epoxy coating at SAR 35–95 per m², or a bitumen membrane at SAR 15–35 per m² for areas that need a flexible seal. Each recommendation is tied to a measured area or length, so the quote reflects what the tank actually needs.

To make the visit productive, have the tank's approximate dimensions ready, including the length, width and water depth, so the technician can estimate the surface area to be treated. Clear access to the tank's top, inside and around the base, and to the roof if it is involved, will save time on the day. Tell the technician when the tank was last cleaned and emptied, because an empty, clean tank allows a proper inspection of the surfaces. Note any leaks you have seen, the locations where you noticed damp patches, and any cracks you already know about. Having that information written down gives the technician a clear starting point and lets you compare the proposed work against what you observed yourself.

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

When do you need water tank waterproofing?

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

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

Causes we see in the field

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

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.

Quick comparison: facts and costs in Zhra Lbn

Common questions about water tank waterproofing in Zhra Lbn

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.