Slot Block Water Barriers

Slot Block Water-Filled Barriers for Temporary Heras Fencing

The Slot Block is a UK-designed, water-filled barrier base that stabilises standard temporary Heras fencing panels while eliminating trip hazards at ground level. Exclusive to the UK market, it attaches directly to temporary mesh fencing and provides a low-profile, hi-vis alternative to traditional rubber fence feet.

Available in Red, White, Yellow, and Black, Slot Blocks are independently tested, weatherproof, and suitable for construction sites, roadworks, and event perimeters across the UK.

** Please note: 2 Slot Blocks are required per Heras panel. **

Key Features

• UK-designed and independently tested

• Water-filled on-site for effective ballast weight

• 1.75m length per block — 2 required per standard Heras panel

• Eliminates trip hazards at the base of temporary fencing

• Hi-vis colours: available in Red, White, Yellow, and Black

• Weatherproof construction for year-round outdoor use

• Compatible with standard temporary mesh fencing panels

• Download the Slot Block Installation Guide

Whether you're securing a construction site perimeter or managing pedestrian safety at an event, the Slot Block works seamlessly alongside our full range of temporary fencing components and accessories. For sites with high wind exposure, see our guide on temporary fencing in high winds.

Our Specialist Fencing Team is happy to help with sales, planning, and hire — get in touch today.