New Catergory for Green Zone - Technical Category 3 Blue
Technical Category 3 (blue): moderate to significant land damage from liquefaction is possible in future significant earthquakes. Foundation solutions should be based on site-specific geotechnical investigation and specific engineering foundation design where foundation repairs or rebuilds are needed. This might involve deep piles.
New foundation techniques are being trialled
The Department of Building and Housing is now testing a range of foundations for TC3 (blue) properties with results due by mid-December.
Some of the trial techniques have been used in roading but not previously for homes. However, they may be cheaper than sinking deep piles.
The department said updated guidance for repairing or rebuilding homes and design guidance for Technical Category 3 was due to be provided by the end of February 2012. Download this PDF
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