Water tank waterproofing for restaurants in Najran

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

Before we start: what we know about Najran

The centre of Najran sits about 1309 m above sea level (SRTM open elevation data). Main roads in or near Najran: Al Jarba Street.

Team note on Najran: 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..

Before any work begins on a restaurant water tank in Najran, the technician checks the tank's internal condition and its exposure to the local climate. The city's centre sits about 1309 m above sea level (SRTM open elevation data), which means strong daytime sun and cool nights that can cause repeated expansion and contraction in tank walls and coatings. For that reason, the first checks focus on hairline cracks, lifted old coatings, and any sign that the tank has already been moving or flexing. Tank internal coating is priced at SAR 25–60 per m², and the scope of that work depends on how much of the existing surface has already failed, so an accurate measurement of the wetted area is taken early.

Several points can only be settled on the site visit. The technician confirms the true tank area, the type of substrate (concrete, block, or steel), and whether moisture is rising from the base. Crack injection is charged per metre at SAR 40–120 per m, so every crack is mapped and its length recorded in place rather than estimated from a distance. Whether a tank needs a full recoat or only spot repairs is also decided on the spot, since surface preparation affects whether an epoxy coating at SAR 35–90 per m² or a spray foam system at SAR 20–45 per m² will bond properly. Any rooftop or exterior work, such as liquid roof waterproofing at SAR 8–25 per m² or a bitumen membrane at SAR 15–35 per m², is also measured and assessed during the visit.

To help the technician prepare, the restaurant owner or manager should note when the tank was last cleaned and drained, whether any water taste or colour changes have been noticed, and how the tank is accessed and ventilated. Clear access to the tank lid and roof, and a reliable water supply for testing, shortens the visit. If XPS boards are being considered for insulating the tank exterior, at SAR 12–30 per m², the technician will need the exact wall dimensions and details of the roof slab. Sharing old invoices or earlier repair records also helps, because they show what has already been tried and what did or did not hold.

For restaurants, visits are planned outside service hours and recorded for the premises file.

When do you need water tank waterproofing?

The following signs are worth checking before they grow:

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

How we choose the tool in Najran

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 — Najran

Questions from Najran

Common mistakes we see

• 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.