What we buy
- Cementitious waterproofing — two-component and single-component, for wet areas, pools and basements.
- Polyurethane coatings — single and two-component, aromatic and aliphatic, for roofs and exposed decks.
- Bitumen membranes — SBS and APP modified, torch-applied and self-adhesive, 3 mm to 5 mm.
- PVC and TPO membranes — for flat roofs, planters and mechanical rooms.
- Sealants and adhesives — silicone, polyurethane, MS polymer, tile adhesives and grouts.
- Drainage and accessory systems — protection boards, dimpled drainage mats, tapes, primers.
The thing that actually goes wrong
A supplier sends a genuine test report. It is real, from a real lab, with a real stamp. It is also for a product with the same name, made two years ago, at a different thickness, to a different standard than the one your project specifies.
Nobody catches it, because on paper everything matches. It surfaces eighteen months later as a failure investigation where the first question is "which batch was this?" — and nobody can answer.
How we handle it
Before quoting, we write down the service conditions: substrate, exposure, temperature range, expected life, and the standard the project has to meet. That document goes to the factory. What comes back is not just a price — it is a proposed product with a data sheet, and we compare the two.
At production and again at loading, we check that the batch numbers on the packaging correspond to the batch on the certificate and the report. Photographs of the actual labels, not the catalogue.
If a report is missing for the specific product you need, testing can be arranged through a third-party lab at cost. If a factory cannot supply a matching report and you cannot wait for testing, we tell you before you place the order.
Questions specific to this line
Can you supply to our national standard rather than GB?
+Usually yes, but it changes the product, not just the paperwork. Many factories produce an export grade formulated to ASTM or EN specifications; some simply relabel the domestic product. We check which one we are being offered by comparing the data sheet figures, not the cover page — and we will tell you when the price suggests relabelling.
How do we verify the material before shipment?
+Three things: pull a sample from the actual production batch and send it to you, check the batch code against the certificate, and where the stakes justify it, commission an independent lab test on the production sample. For membranes, thickness and weight per square metre are quick, cheap checks that catch most substitutions.
Is it worth buying waterproofing from China at all?
+For commodity membranes and coatings at volume, yes — the cost difference is real. For a small area where a failure means ripping out a bathroom, the price difference rarely covers the risk. We will say which side of that line your project is on, even when it means a smaller order for us.