Chapter 06

The Original Soil Test

If you can get a copy of the original soil test, there is a wealth of information available to you. It is so important in assessing the performance of  a new house, that I would almost say it is imperative that you assess the original soil test as part of your slab heave investigation.

Look for these features:

  1. Was the soil test provided by an experienced, local soil tester?
  2. Was the soil tester registered to provide the soil test?
  3. Was the soil tester engaged by the owner of the residence, the builder or the developer?

Then you can assess these elements of the soil test:

  1. What was the site classification?
  2. Is the site the correct site. If there is a site plan does it match the shape of the site?
  3. Does the date on the soil report predate the engineer’s design and the footing pour date?
  4. Was fill identified on the site. Was it controlled fill?
  5. Were Atterburg limits or shrink swell indices used to calculate the site reactivity
  6. Was the site reactivity expressed as a range or a specific number?
  7. Does the soil in the borelogs correspond with the soil in the description section of the report.
  8. Which soil layer was used to calculate the Atterburg limits or Shrink swell index.
  9. Does the depth of testing match the required depth as per AS2870?
  10. Do the DCPs match the description of the firmness of the soil?

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How to Identify and Fix Slab Heave