Certificates are collected and filed without being read. Six assumptions about what they actually establish.
Material certificates are requested because specifications require them, filed without review and produced at handover as evidence of quality. What they establish depends on what was tested, when, and whether it relates to the material actually delivered.
How to test a claim like this
Test any certificate by asking three questions: what exactly was tested, when, and can it be traced to the material on your site. A certificate that cannot answer all three is paperwork rather than evidence.
Myth 1: A certificate proves the material on site meets the specification
Reality: It proves that a tested sample met it. Traceability between that sample and your delivery is what connects the two.
How to check it yourself: Match batch or heat numbers on the certificate against the delivery documentation.
Myth 2: All certificates carry equal weight
Reality: A manufacturer's declaration and an accredited third party test report are different things.
How to check it yourself: Ask who performed the testing and whether the laboratory is accredited for that test.
Myth 3: A certificate remains valid indefinitely
Reality: Certificates relate to production at a point in time, and materials degrade with storage and handling.
How to check it yourself: Check dates and consider how the material has been stored since.
Myth 4: Testing on site is unnecessary if certificates are provided
Reality: Site testing verifies what arrived and how it performs in place, which certificates cannot address.
How to check it yourself: Maintain the specified site testing regime regardless of supplier documentation.
Myth 5: Certificates cover installation quality
Reality: They address the material, not how it was installed, and most failures are installation related.
How to check it yourself: Require installation records and inspection alongside material certificates.
Myth 6: Collecting certificates is an administrative task
Reality: They form part of the building's record and matter for warranty claims, future transactions and any dispute.
How to check it yourself: File certificates with the project records rather than allowing them to remain with the contractor.
What this changes in your decision
- Match certificates to deliveries by batch or reference.
- Establish who tested and whether the laboratory is accredited.
- Maintain the site testing regime independently of supplier documentation.
- Require installation records alongside material certificates.
- Keep certificates in the project file, not with the contractor.
If you are procuring materials for a project, Domira can specify, source and verify them against the standards your drawings actually require.
Frequently Asked Questions
Which materials most need certification?
Anything structural or safety related: concrete, reinforcement, structural steel and fire related products. Waterproofing systems also warrant documentation, both for the material and for approved installation.
Can I test materials independently?
Yes, and independent testing at the specified frequency is normal practice for structural materials. It verifies what was delivered rather than what was manufactured, and the two are not always the same.
What should I do if certification cannot be provided?
Treat the material as unverified. For structural or safety related items, that usually means rejecting it, since the alternative is a building whose key materials cannot be evidenced when it matters.
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