Short answer
Before hiring a waterproofing contractor in Abu Dhabi, check seven things: a valid trade licence and VAT invoice, a diagnosis of the source before the price, a method that matches the problem, product data sheets and a method statement, registration with the product manufacturer, a written warranty from the contractor (manufacturers do not warrant installation), and how the repair will be verified.
Most waterproofing quotes in Abu Dhabi look alike: a price per square metre and a promise that the leak will stop. The difference between a repair that lasts and one you pay for twice comes down to a few things you can check before you sign: the licence, the method, the materials, who is trained to apply them, and what the warranty actually covers.
1. Is the company licensed to do the work?
Ask for the trade licence and check that it is current and covers contracting work. Check that the company is VAT-registered and will issue a tax invoice. A contractor who cannot show a licence, or who asks for cash with no invoice, cannot be held to a warranty.
2. Did they find the cause before they priced the job?
A good contractor inspects before quoting and tells you where the water is coming from, not just where it shows. Ask how they located the leak. Thermal imaging and moisture readings give evidence; a glance at the stain does not. See how leak detection works.
3. Does the method match the problem?
A new membrane or coating suits new construction and exposed roofs. Water coming through the concrete of an existing basement, slab or tank needs injection from inside. A contractor who proposes the same product for every problem is selling a product, not a repair. See injection vs membrane waterproofing.
4. Will they show you the data sheets and method statement?
Every serious waterproofing product has a technical data sheet (what the material is, where it can be used, its limits), a safety data sheet, and a method statement (how to apply it). Ask for them before work starts. Check that:
- The product is meant for your situation: an active leak, a damp crack, a drinking water tank.
- The data sheet names the standard it meets. For concrete injection, that is EN 1504-5.
- For a drinking water tank, the data sheet says in writing that the material is suitable for potable water.
On larger projects a consultant will ask for these documents anyway, as part of a material submittal. A contractor who already has them organised is used to working at that standard.
5. Are they trained and registered by the manufacturer?
This is the question most owners never ask. Injection resins only perform to their data sheet when they are mixed, pumped and injected correctly. Manufacturer method statements say that injection should be carried out by skilled crews, and that personnel should hold a current certificate of competence from the supplier.
Manufacturers run registered or approved applicator schemes for exactly this reason. Ask whether the contractor is registered with the manufacturer of the product they are proposing, and ask to see the certificate and its expiry date. Dot Expert's registered applicator certificate is published on our website.
6. What does the warranty actually cover?
Read this part of the data sheet carefully: manufacturers typically warrant that their product meets its specification, but they do not warrant the installation, because they do not control it. That means the warranty on the repair itself has to come from the contractor.
Ask for it in writing, and check:
- How long it lasts, from the completion date.
- What it covers: watertightness at each treated location, not just "materials".
- What happens if water returns: re-injection at no cost, and how quickly they will attend.
At Dot Expert, the workmanship and materials warranty on injection work is typically twelve months and covers the watertightness of every treated location.
7. How will they prove the repair worked?
"It looks dry" is not proof, especially if the area has just been painted. Ask how the repair will be verified: a re-inspection after curing, moisture readings, or a thermal imaging scan compared with the one taken before the work.
Questions to ask, and the answers to watch for
| Ask | A good answer | A warning sign |
|---|---|---|
| Where is the water coming from? | A specific source, with evidence | A price before anyone has looked |
| Which product, and why? | Named product, matched to the problem | The same product for everything |
| Can I see the data sheet? | Yes, before work starts | Vague answers, or no paperwork |
| Are your crews trained by the manufacturer? | Yes, with a current certificate | No, or no proof |
| What is the warranty? | Written, per treated location, with a duration | A "lifetime" promise, but only verbally |
| How will you check it worked? | Re-inspection or a scan after curing | "You will see it is dry" |
The lowest quote is often low because one of these steps is missing. Compare quotes on what they include, not just on the price per square metre. For typical prices, see our waterproofing cost guide.
Dot Expert is a X-Calibur Construction Chemistry registered applicator — our injection crews are trained and certified by the manufacturer. View the certificate