Thickness testing in outline: read locations, measurements and criteria
An office floor's thickness report has a satisfactory-looking summary, but a column entry is flagged. The ceiling contractor asks whether the overall average means the floor can close. You need to read the location and governing criterion before translating the report into a release.
Match the report's locations, method and results with the actual protection requirements before deciding what it establishes. Thickness measurement and acceptance are separate questions. Public inspection illustrations show measurements on different member surfaces and reported summaries; they do not supply this project's sampling pattern or authorize an average to erase a flagged individual result.
Read the report before arranging a correction
- Confirm the tested scope. Check the date, agency, product, level, grids and member identification. Compare the locations with the current scope plan and relevant design. Ask the agency to clarify an unclear member reference rather than assuming that one page headed 'floor three' covers every member on that floor.
- Identify the method and requirements. Record the method and edition cited by the agency and the actual design or specification criteria used. ASTM E605/E605M's public scope covers thickness and density methods without establishing performance levels. Ask about missing references instead of importing a percentage tolerance from a previous job.
- Distinguish readings from summaries. Locate individual measurements, calculated summaries and the agency's findings. Ask how the recorded locations and values relate to the member arrangement and actual method. Keep different products and member types separate; an overall average is not evidence that each required criterion has been addressed.
- Trace the flagged location. Mark its member and surface on the area record and ask the agency what remains unresolved. Obtain required assessment or correction through the project process. Do not send a crew to add material everywhere, change the criterion or retake only favourable locations to improve the summary.
- Coordinate review of the response. Keep the directed repair, required follow-up measurements and report linked to the original finding. Arrange access before concealment. A completed patch or crew self-check should be labelled accurately while the agency or responsible reviewer completes the specified acceptance process.
- Record the limited release outcome. State which scope and activities the actual decision covers, with open locations or pending evidence identified. Preserve the original and revised reports together. Do not broaden the tested scope or write a whole-building pass from a report addressing selected areas.
Common mistakes
- Using a summary to hide an individual flagged result.
- Losing the member surface and location behind a floor label.
- Calling crew readings a replacement for specified agency checks.
Checklist
Read six report fields
- Agency, date and tested locations.
- Current product and design references.
- Method and acceptance criteria.
- Individual readings and summaries distinguished.
- Flagged locations and directed follow-up.
- Actual release scope and pending evidence.
Check your understanding
A summary is satisfactory while one required individual result is flagged. Can the summary close that finding?
