Water tank waterproofing for residential buildings in Alzulfi

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

Why water tank waterproofing differs in Alzulfi

Team note on Alzulfi: 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.. The centre of Alzulfi sits about 615 m above sea level (SRTM open elevation data).

Main roads in or near Alzulfi: King Fahd Road, Sheikh Ibn Baz Square, King Salman Road.

Does a water tank in Alzulfi really need waterproofing, and how would a property owner know if it is failing? Alzulfi sits at about 615 m above sea level, and many homes here rely on rooftop and ground-level tanks to keep a steady supply. A tank that leaks loses water and can damage the structure beneath it, so it is worth checking the surface before the problem spreads. Tank internal coating is priced at SAR 25–60 per m², which covers the inside surfaces where water is held. Where the tank sits on a roof, liquid roof waterproofing at SAR 8–25 per m² is the typical starting point, and a bitumen membrane at SAR 15–35 per m² is another option for larger areas.

A service visit usually begins with a walk around the tank and the area beneath it to look for damp patches, staining, or cracks in the concrete. The technician then examines the joints, corners, and any visible cracks, since these are the most common routes for water to escape. Where a crack is found, crack injection is measured per metre at SAR 40–120 per m, so the length is noted during the inspection. The inside of the tank is checked for flaking or loose old coating, because a sound surface is needed before any new layer can bond properly. The findings are then explained so the owner understands which areas need work and which can wait.

Before the visit, it helps to clear access to the tank and the roof or floor below, so the technician can reach every side without moving stored items. Note when you first noticed water loss or damp, and keep any old invoices or details of previous repairs, since these show what has already been done. Make sure the water supply can be shut off during the inspection, and tell the technician whether the tank is in use, because it may need to be emptied and dried before coating. Having this information ready makes the assessment faster and gives you a clearer quotation based on the measured areas.

For a whole building, a survey of the shared systems comes before unit-by-unit work.

When do you need water tank waterproofing?

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

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

Causes we see in the field

• Construction joints.
• Damaged old coating.
• Cracks in the walls or floor.

Tools we use in Alzulfi

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.

Facts and costs — Alzulfi

Common questions about water tank waterproofing in Alzulfi

What we advise against

• Using a material that is not intended for drinking water

What you receive

You receive: the material name, its batch number and the fill-test result, in a technical report with a verification code.