187440-GEO-Site Classification Report[A] (1)

6.0        Foundation Design Recommendations_________________________________
Based on the site classification an engineer designed foundation systems is required at this site. The foundation systems
must be designed to cater for the potential movements associated with the drying effects of a tree or a group of trees.
The designer may adopt the classification of the site "Class M" for the purposes of determining the total Yt. The
designer should also pay close attention to any adverse scenario where the tree is removed and the subsequent heave
that could be expected under this scenario.

           6.1      Maintenance Recommendations
In line with AS 2870-2011 Appendices A and B, the owner, future owner, any stakeholder, and any consultant, have a
duty of care to ensure that future landscaping will not contribute to an adverse impact on the footing system. Intrax
recommends reference to the following resources when planning landscaping works for the site:

       •   HEDRA – How to protect your house (https://bit.ly/3opoBQf)
       •   CSIRO – Foundation Maintenance and Footing Performance: A Homeowner’s Guide [2003]
           (https://bit.ly/3qe0yGb)
       •   QBCC – A guide to preventing structural damage (https://bit.ly/2YqosTr)




           6.2      Allowable Bearing Pressures___________________________________________________
The following allowable bearing pressures can be adopted for the soils listed in the table below. These bearing pressures
apply where typically the embedment is a minimum of 100mm into the specified material.



                                                                              Maximum Allowable Bearing Capacity
              Soil Type                 Indicative Founding Depth (mm)
                                                                                           (kPa)

    Natural Clay1                                 Refer to Borelogs                       Refer to Borelogs




1
    Natural Material – All-natural material given allowable bearing capacities denotes strength at optimum moisture
conditions. The potential presence of perched groundwater in soils may lead to construction difficulties during wet
weather. Please refer to Section 4.2 for site specific difficulties.


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