Concrete, hardened: relative humidity measured in drilled holes (NT BUILD 439)

  • Report #: NT BUILD 439
  • Approved: November 1995
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This method describes the measurement of the relative humidity of concrete by single measurements on site in a drilled hole.


This method is intended for measuring the relative humidity of concrete, in a hole drilled in the concrete, for monitoring the progress of drying out of residual building moisture or drying out after, for example, water damage. The main purpose of measurement is to indicate when floors can be laid or surface coverings or treatments applied, but it can also be used when investigating the reasons for water damage. It is applicable primarily for measurements in concrete structures without temperature gradients.

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