Gravel Board Calculator — Fence Base Protection

Boards sitting between ground and fence panels, protecting panels from moisture and rot. Usually 150mm high.

Concrete lasts much longer and is worth the extra cost. Timber boards are cheaper but rot over time.

Yes — gravel boards fix to the posts with galvanised clips (also called gravel board brackets). Typically 2 per board, one at each post end; this calculator defaults to 2 but you can raise it to 3–4 per board for exposed or windy sites in the advanced options.

A gravel board is a horizontal board fitted between fence posts at ground level, below the fence panels. It protects the panels from ground moisture, rot, and soil contact.

Concrete gravel boards last much longer and will not rot. They are heavier and slightly more expensive but are a worthwhile investment for long-term fencing.