How to manage site drainage to prevent moisture damage to foundations?

Effective site drainage is paramount to prevent moisture damage to foundations in Australian residential construction. This involves implementing a multi-pronged approach, starting with proper site grading to ensure all surface water flows away from the building, ideally with a minimum 5% slope for the first metre. Install perimeter sub-surface drainage systems, such as ag-drains with geotextile fabric, connected to stormwater outlets or detention systems. Ensure downpipes are connected to stormwater drains, discharging water well away from the foundation. Regular maintenance, including clearing gutters and drains, is critical to ensure the long-term effectiveness of these measures, safeguarding structural integrity and preventing costly rectification works.