Water tank waterproofing — service guide
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A concrete tank cracks with time and loses water or receives water from the soil; a roof tank heats its water in summer and grows algae if light enters. Internal lining treats the first with a seamless drinking-water-suitable layer, and external insulation treats the second. In both cases we start with an inspection that identifies the cause before choosing the treatment.
Types of tank waterproofing
- Cementitious internal lining (flexible cement-based materials): two or more coats on the walls and floor of a concrete tank after treatment; suitable for drinking water when the material is designated for it per the manufacturer’s data.
- Drinking-water-suitable epoxy lining: a hard, easy-to-clean layer; needs a dry substrate and careful preparation.
- Crack and joint treatment by injection or sealing before lining.
- External insulation of a roof tank: boards or spray foam with a protective jacket to reduce water heating.
Our condition for any internal material: it must be designated for contact with drinking water per the manufacturer’s documents, and we record its name and batch number in the execution record.
When do you need it?
- The tank inspection result points to loss from the body or outside water entering.
- Visible cracks, salt deposits or flaking on the inside walls.
- An old concrete tank with no lining or with a flaking one.
- Roof-tank water hot in summer or showing algae.
- Before commissioning a new tank in a new build.
How we execute the internal lining
- Emptying and ventilation: empty the tank, ventilate it and cut power to the pump; nobody works inside a closed tank without a person outside and ventilation.
- Cleaning and preparation: remove sediment and loose layers, wash the walls and dry the substrate as the material requires.
- Treat cracks and joints and floor corners with suitable sealants.
- Lining coats per material, thickness and drying time between coats.
- Disinfection after the lining cures per the material’s instructions, then rinsing.
- Fill test: we fill the tank and watch the level for a set period and check the surroundings.
- Documentation: photos of each stage, materials and batch numbers and the test result in the quality record.
Cleaning and disinfection
Tank cleaning and disinfection can be requested on its own or with the lining. We use disinfectants designated for drinking-water tanks and rinse the tank afterwards until no trace remains.
How the service runs, step by step
- Booking
Tank type, lining side (internal/external), capacity and whether you want cleaning and disinfection in the order form.
- Survey
Checking the body, cracks and connections, choosing the suitable material, and a written quote.
- What we need from you
The ability to empty the tank (or arrange alternative water for a day or more), and access to the hatch and power.
- Execution
Two to several days depending on capacity, material and drying time.
- Test and handover
A documented fill test, then the warranty and execution record.
What you receive
- A written quote with the material, its drinking-water suitability and the number of coats.
- An execution record with photos, batch numbers and the fill-test result.
- A numbered warranty certificate with verify code.
- Guidance: cleaning frequency, and no abrasive materials inside the tank.
How pricing works
Published inspection fee: 150.00 SAR (VAT included). Any further work is quoted after the on-site assessment, in writing, before it starts.
The price depends on capacity and internal area, material type, the extent of crack treatment, and whether cleaning and disinfection is requested. Large and deeply buried tanks need more time and ventilation.
Verifying the report and warranty
Every inspection report and warranty certificate we issue carries a serial number, a verification code and a QR code. Enter the code on the verification page to confirm the document really came from us, that it has not been altered or revoked, and the warranty expiry date where one applies. A buyer, landlord or insurer can verify it the same way without contacting us.
Frequently asked questions
Is the lining material safe for drinking water?
We use only materials designated for contact with drinking water per the manufacturer’s documents, record their name and batch number, and disinfect and rinse the tank before handover.
How many days is the tank out of service?
It depends on the material’s drying time, number of coats and capacity; we state the period in the quote so you can arrange alternative water.
Can fibreglass or polyethylene tanks be lined?
Cracks in those tanks are treated differently (welding or special materials), and the survey decides whether repair is worthwhile or replacement is better.
Does external insulation cool the roof tank?
It reduces heat gain from the sun so the water stays less hot; it does not act as cooling. A light colour and a protective jacket help.
Water enters the tank from the soil — is internal lining enough?
Usually yes when executed with a material that withstands negative pressure plus crack treatment, and we confirm with the fill test and level monitoring.
On-site service is available in Saudi Arabia; the guides and tools can be read anywhere.
This page is informational and educational. Confirming a leak, an insulation condition or a pest infestation always requires an on-site assessment, and structural questions are for a licensed engineer. We do not publish promises we cannot prove.