Water tank waterproofing for duplexes in Rastanura

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

What is specific about Rastanura for water tank waterproofing

Team note on Rastanura: Kashf teams serve this city and its nearby districts with the same documented inspection standard: device-based leak detection without demolition, a written report, and a clear scope before any work begins.. Rastanura is about 0.2 km from the sea coast (OpenStreetMap).

Is a water tank on a duplex roof in Rastanura worth waterproofing, and what will it cost? Rastanura sits about 0.2 km from the sea coast, so the air is salty and humid, and that exposure can wear down tank walls and joints over time. Tank internal coating is priced at SAR 25–60 per m², which is the main figure to budget against when the tank is opened up for repair. Where the tank sits on a roof, liquid roof waterproofing is priced at SAR 8–25 per m², and bitumen membrane at SAR 15–35 per m², so the roof surface and the tank base should be looked at together.

Before any work is quoted, the inspection walks through the tank and the roof around it. The inspector checks the inside of the tank for cracks, flaking, or staining, and looks at the joints where walls meet the base. If a crack is found, crack injection is priced at SAR 40–120 per metre, so the length of each crack is measured. The surface that will receive coating is measured in square metres so the quote follows the real area. Where a tank is set on a roof slab, the slab and its edges are checked for ponding and for any gap where water could track in. Where insulation is considered, XPS boards are priced at SAR 12–30 per m², and the choice between a membrane, a liquid coat, or insulation is made after these readings are in.

To prepare for the visit, empty the tank as far as possible so the inner surface can be seen and measured. Clear the roof area around the tank of loose debris, furniture, and stored items, and make sure access to the roof hatch is open. Note any past leaks, damp patches on ceilings below, or dates of earlier repairs, since these help the inspector trace the source. Have the tank's approximate size and the roof's layout ready, and mention whether the duplex is occupied during the work, so water supply and timing can be planned. With these items ready, the inspection can move straight to measuring and a clear, itemised quote.

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

Signs that call for water tank waterproofing

The following signs are worth checking before they grow:

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

Causes we see in the field

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

How we choose the tool in Rastanura

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 — Rastanura

Questions from Rastanura

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.