Water tank waterproofing for schools in Aldarb

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

Before we start: what we know about Aldarb

Aldarb is about 18.7 km from the sea coast (OpenStreetMap). The centre of Aldarb sits about 79 m above sea level (SRTM open elevation data).

Do school water tanks in Aldarb need waterproofing, and how do you know when they do? Aldarb's centre sits about 79 m above sea level (SRTM open elevation data), and it lies about 18.7 km from the sea coast (OpenStreetMap). Those figures matter less for a tank than the daily use it gets, but they set the setting in which tanks are filled, drained and left standing through the seasons. A school tank that leaks, shows damp patches on its outer walls or loses pressure needs a closer look before the problem spreads into the building beneath it.

The inspection starts with a walk around the tank and the plant room, then moves to the tank itself once it has been emptied and cleaned. The inspector checks the internal surfaces for cracks, flaking and wet zones, and marks any crack that needs injecting. Where a tank is coated, the inspector looks at the condition of the existing layer and at the joints. Prices for the common work are listed by unit: tank internal coating is SAR 25–60 per m², epoxy coating is SAR 35–90 per m², and crack injection is SAR 40–120 per metre. Liquid roof waterproofing is SAR 8–25 per m², and where a roof above a tank is involved, bitumen membrane is SAR 15–35 per m², while XPS boards are SAR 12–30 per m² for insulation work. The inspector then records measurements so the quote reflects the real area and length rather than an estimate.

Before the visit, the school should arrange access to the tank, the plant room and the roof, and make sure the tank can be drained and kept out of use while the inspection takes place. Keep the water supply records, any earlier repair invoices and a rough plan of the tank dimensions to hand, since these speed up the measuring. Tell the inspector which areas leak, when the leaks appear and whether they follow rainfall or the filling cycle. Clear the space around the tank lid and the access ladder, and arrange a contact who can unlock the plant room. With those steps in place, the inspection can move quickly and the quote can be matched to the work the tank actually needs.

For schools, the larger jobs are planned for weekends and holidays.

When do you need 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.
• A common cause: cracks in the walls or floor.
• Damaged old coating.

How we choose the tool in Aldarb

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 Aldarb

Common questions about water tank waterproofing in Aldarb

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.