Exposed Aggregate Concrete Gap: Standards and Best Practices
When installing exposed aggregate concrete along a fence line, a gap is standard for formwork removal and drainage. The typical gap ranges from 50-150mm, with 75-100mm being common. Homeowners should plan for this gap and choose appropriate fill to avoid issues.
Key Takeaways
Standard Gap Range
Industry practice allows a gap of 50-150mm between concrete and fence, with 75-100mm being typical. This accommodates formwork access and rainwater runoff.
Avoid Soil Fill
Never fill the gap with soil, as it can rust fence posts and sheets, and wash back onto concrete. Instead, use geotextile fabric and coarse aggregate like 25mm pebbles.
Consider Plantings
For shaded south-facing gaps, shade-tolerant plants like Mondo grass or NZ lily can be attractive. Ensure proper drainage with aggregate base to prevent water pooling.
Drainage Solution
For optimal drainage, dig below the fence rail, lay agri cloth and slotted agri pipe, then cover with pebbles. This prevents erosion and keeps the gap functional.
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