AS2870 Site Classification
AS2870 Site Classification
(OP)
I typically get asked to quote to design residential projects consisting of small granny flats up to 2-3 storey houses. These foundations are typically designed in accordance with the Australian Standard AS2870 Residential Slabs and Footings. As I am a structural engineer I understand from the code that the classification of the site should be undertaken by someone who has geotechnical experience. So I usually request a geotechnical report even for the granny flats and single storey extensions as I would not back my knowledge of geotechnical matters. I have found though that when I have got geotechnical engineers to quote the quotes range from $600 to $2,000 for a granny flat. This usually results in the client going with someone cheaper, who for some reason doesn't require a geotech report. Has anyone else come across this and how do you get the information you require to get a classification for a site. I am based in Sydney.





RE: AS2870 Site Classification
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RE: AS2870 Site Classification
In respect to new dwellings, a 'geotech report' is typically only required for large buildings such as new large three storey houses etc where there is considerable risk. What you want for smaller buildings is a 'site classification report' which should be cheaper (typically around $500). The difference is that a geotech report can be pages and pages of useless information that is not required for small dwellings, whereas a site class report is only a single page stating the site classification in accordance with AS2870. State in your contract with the client that: if the site classification report exposes underlying soil complexity/issues then a full geotechnical report will be recommended. This note would cover sites such as P class where you would need additional information.
If anyone else has other experience then it would be good to hear it.