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Waterproofing

Peeling, bubbling and bare spots: investigate traffic coating defects before repair

By Review.LivePublished 3 min readHow we write

After a winter of use, a hotel ramp has a loose coating edge and several raised patches. The owner asks for an immediate topcoat over the whole ramp. The project manager needs to preserve useful evidence before any repair hides the condition or assumes its cause.

Grey repair bands cross an unoccupied concrete floor beside a vacuum hose, nozzle and red cord.
Photo: MTA Capital Construction Mega Projects on Wikimedia Commons · Installation of epoxy and screen mesh to fix cracks on the existing concrete floor at the southern end of the future LIRR passenger concourse. (49363293063) · CC BY 2.0 · Cropped, resized, colour adjusted and sharpened.

Record the observed defect first, then investigate its cause and suitable repair through the responsible technical team. The cited application guidance identifies several possible contributors to coating problems and calls for technical advice on repairs. A raised patch can prompt investigation; its shape does not prove which contributor applies. A quick covering operation can also hide evidence the assessor needs.

Build the evidence before choosing the repair

  1. Record location and extent. Mark the ramp, aisle or stall area on the plan and take context and detail photographs where safe. Describe peeling, raised areas, visible wear or cracking neutrally. Keep observed extent separate from an assumed hidden extent or a claim that the whole level has failed.
  2. Arrange the appropriate immediate response. Refer access, loose material and other concerns through the building and site’s competent process. Preserve the area as directed. Do not cut open the assembly, pressure-wash away evidence or leave a questioned hazard for the convenience of an inspection appointment.
  3. Gather the relevant history. Retain the installed assembly, substrate and preparation records, layer checks, actual conditions, repairs and maintenance information. Identify missing evidence honestly. A missing primer record is a question to investigate, not proof that primer was omitted.
  4. Obtain an investigation arrangement. Have responsible technical people define the assessment, access and any approved testing or sampling. Record who performs it and what it can establish. Separate the investigator’s supported finding from provisional suggestions offered in an owner email.
  5. Get a scoped repair decision. Retain the approved area, layer work, preparation, compatible materials, checks and release requirements. Clarify whether further substrate or joint work is needed. A local patch, zone treatment and wider removal are options to assess, not choices the manager should make from photographs alone.
  6. Link correction with verification. Preserve the original observations and assessment beside the actual repair and required review. Record the released boundary and ongoing maintenance instructions. Do not replace the defect history with a clean after-photo or promise that this repair settles every condition elsewhere.

Checklist

The defect and repair file

  • Neutral located observations.
  • Required immediate response.
  • Installation and maintenance evidence.
  • Qualified investigation and supported findings.
  • Approved repair boundary and requirements.
  • Correction, verification and release history.

Check your understanding

The installation file has no primer photograph. Does that establish the cause of peeling?

Show the answer
State the gap and refer it with the other evidence. An absent photograph does not establish whether primer was applied or what caused the defect. The responsible investigation should support the finding and the repair scope.

Sources

  1. Vulkem 350/Epoxy WC/346 Application InstructionsTremco · Product-specific joint and troubleshooting guidance; actual details need authorized assessment · accessed