Water tank waterproofing in Alzulfi: for companies (annual contract)

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

What is specific about Alzulfi for water tank waterproofing

Main roads in or near Alzulfi: King Fahd Road, Sheikh Ibn Baz Square, King Salman Road. The centre of Alzulfi sits about 615 m above sea level (SRTM open elevation data).

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, according to SRTM open elevation data, which places the town on high ground in the Hail region. This elevation brings wide temperature swings between day and night, and the dry air can dry out and stress coatings quickly. For water tanks on rooftops and in yards, the practical effect is that the surface must be well prepared and the coating must be able to handle expansion and contraction. A tank coating that is applied too thinly or over a damp surface will not hold up well through repeated temperature cycles.

Because the area is elevated and open, rooftops and exposed tank walls receive strong sun for much of the year, and this heat ages membranes faster than in shaded locations. Tank internal coating is priced at SAR 25–60 per m², and the work is usually scheduled when the tank is drained and can be fully cleaned and dried. Liquid roof waterproofing is priced at SAR 8–25 per m², and it suits flat roofs where a seamless layer can be built up over the parapets. Bitumen membrane at SAR 15–35 per m² is another option for roofs, while XPS boards at SAR 12–30 per m² can be used where insulation is also wanted. The right choice depends on how the roof and tank are used and how much sun they receive.

Company owners in Alzulfi can avoid several common mistakes. They should not coat a tank while it still holds water or while the surface is damp, since trapped moisture prevents adhesion. They should not skip crack repair: crack injection at SAR 40–120 per metre should be done before any surface coating, otherwise the leak simply moves. They should not treat the cheapest per-square-metre quote as the full cost, because surface preparation and drying time affect the result. Finally, owners should keep records of the product used, the date of application and the warranty terms, so that future maintenance is planned rather than reactive.

For companies, an annual contract sets the scope, the visit schedule and the reports in writing.

Signs worth paying attention to

The following signs are worth checking before they grow:

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

The most common causes

• Cracks in the walls or floor — we check this before anything else.
• Damaged old coating.
• 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 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 get after the work

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.