Water tank waterproofing for duplexes in Baqiq

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

Why water tank waterproofing differs in Baqiq

The centre of Baqiq sits about 83 m above sea level (SRTM open elevation data). Main roads in or near Baqiq: King Fahd Road.

Team note on Baqiq: 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..

Picture a family who owns a duplex in Baqiq. They live on the upper floor and rent the lower one, and the rooftop water tank has quietly become their biggest worry. Every few months there is a damp patch on a ceiling, a faint smell from the tank area, or a stain running down an outside wall. They want the problem fixed once, properly, without having to call a plumber or a waterproofing crew every season.

Baqiq sits about 83 m above sea level, which is a useful detail for an owner to keep in mind. Elevation alone does not decide how water behaves on a roof, but it is one of the local conditions that shapes how the site is exposed. For a duplex owner this means the roof and tank area should be treated as a priority rather than an afterthought. Water that reaches the structure through a small crack can travel into the upper living space, and the cost of a repair grows the longer the leak goes unnoticed. Waterproofing the tank and the roof together is usually more sensible than treating one in isolation, because a leaking roof and a leaking tank often feed the same damp problem.

Start by inspecting the tank and roof surface in daylight, looking for hairline cracks, lifted coating, and stains on the walls below. Mark every crack, since crack injection is priced per metre and it helps to know the total length before getting quotes. Next, decide the scope: a tank internal coating covers the water-contact surfaces, while liquid roof waterproofing protects the exposed roof area. Compare the local rates given for each option, such as tank internal coating at SAR 25–60 per m² and liquid roof waterproofing at SAR 8–25 per m². Then ask each contractor to measure the area themselves and confirm what their figure includes. Finally, schedule the work for dry weather, allow the surface to cure fully before refilling the tank, and keep the invoice and the specification together with the building papers so future owners and tenants can see what was done.

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

Signs that call for water tank waterproofing

If you notice one of these signs in Baqiq, it is a good moment to talk to the team:

• 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.
• Construction joints.

Tools we use in Baqiq

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 — Baqiq

Common questions about water tank waterproofing in Baqiq

Common mistakes we see

• 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.