Water tank waterproofing for residential buildings in Unaizah

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

Water tank waterproofing in Unaizah: the local context

The centre of Unaizah sits about 667 m above sea level (SRTM open elevation data). Team note on Unaizah: 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..

Is my rooftop water tank leaking, and can it be fixed without emptying the whole building? In Unaizah, which sits about 667 m above sea level, tanks and roofs face hot days and cool nights, and small cracks often show up as damp patches or a drop in water pressure before anyone sees a puddle. The answer depends on where the water is getting in, and a proper inspection is the first step to finding out. For tanks, internal coating is priced at SAR 25–55 per m², and epoxy coating at SAR 35–85 per m², so the right treatment depends on the tank's condition and size.

Our inspection follows a clear sequence. First, we check the tank walls, floor and lid for cracks, flaking or staining, and we note any visible water marks. Next, we look at the roof surface above the tank, since leaks often start at the roof and run down. Where cracks are found, crack injection is measured per metre and costs SAR 40–115 per m, so we record the length of every crack we find. For the roof, liquid roof waterproofing costs SAR 10–25 per m² and bitumen membrane costs SAR 15–35 per m², and we explain which suits the surface we see. Spray foam, priced at SAR 20–45 per m², may also be an option for certain roof areas. Once the inspection is complete, you receive a written list of the areas found and the work each one needs.

Before the visit, a few steps will help us work faster and give you a clearer quote. Note when you first noticed the problem and whether it appears after rain, after the tank is filled, or all the time. Clear access to the tank hatch and the roof, and make sure the stairs or ladder are safe to use. If the tank is in use, let us know so we can plan how and when the water is drained. Finally, have the property's measurements to hand, including the approximate tank size and roof area, so the estimate reflects the real scope of the job rather than a guess.

For a residential building, shared risers, tanks and pumps are checked as one system.

When do you need water tank waterproofing?

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

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

Where the problem usually comes from

• Construction joints — we check this before anything else.
• Damaged old coating — we check this before anything else.
• A common cause: cracks in the walls or floor.

How we choose the tool in Unaizah

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 Unaizah

Short answers for Unaizah

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.