Can a crew without tank waterproofing experience build in Hargeisa?

Tank waterproofing experience gaps in Hargeisa matter because stored water finds every weak point in a tank shell. A crew that has waterproofed roofs or bathrooms but never a potable water tank can miss the details that decide whether the structure holds water: joint preparation, coat thickness, corner reinforcement and the flood test itself. The result appears later as damp patches, seepage at the base and stored water leakage that costs money and trust.

What does a tank waterproofing experience gap look like on site?

The gap shows first in the method statement submitted with the bid. A crew with tank experience writes down surface preparation, the number of coats, curing time between coats, and how corners and pipe penetrations are treated. A crew without it writes one line: apply waterproof coating. Cement-based coatings, liquid membranes and bituminous systems each need different surface conditions and drying times, and general practice is to confirm the product data sheet and the project specification with the engineer before starting. Ask to see a tank the crew completed in the last two years. Walk it, look for hairline cracks and damp staining at the base, and ask how the flood test was done. If the answer is vague, the experience is not there.

How does the gap turn into stored water leakage?

Water pressure inside a full tank pushes hardest at the base and at every joint, so any weak coat or unsealed penetration becomes a leak path. Coatings cure at different rates depending on temperature, wind and humidity, and the product data sheet gives the conditions the coating needs, including whether the surface must be kept damp or shaded while it cures. Confirm those requirements against the project specification and the conditions on the day, because a crew without tank experience may not check them. The mechanism is simple: thin coverage, missed laps and untreated construction joints let water through the shell. The gap is not usually visible until the tank is filled, which is why the flood test matters. For a buried or partially buried tank, confirm with the project engineer whether the design calls for external waterproofing and what protection the ground conditions around the tank require.

How do you check waterproofing claims before you sign?

Request the records, not the promises. Ask for the product data sheets, the coats applied at each stage, the membrane lap widths and the flood test result from the crew's last tank, and check that these match the specification. A supervisor with tank experience should be named in the contract, not just the company. If the team has only done roof or wet area work, agree in writing who will inspect surface preparation, corner reinforcement and the flood test before water goes in. Keep a daily record of coats and curing during the work, because it is the only evidence you will have if a leak appears months later. Check what the contract says about defects and retention before you release payments.

What to do next

Before awarding the tank waterproofing package, ask the shortlisted contractor for the flood test record and one site visit to a completed water tank in Hargeisa. If the record does not exist, ask the project engineer to witness surface preparation and the flood test, and ask the project engineer or the relevant authority what approvals or records it requires before work starts.