Specialised silt fence fabric used as an entrenched interceptor fence to control pollution caused by silt laden construction site stormwater run-off.

Specialised silt fence fabric used as an entrenched interceptor fence to control pollution caused by silt laden construction site storm water run-off.

The Problem

Many construction, forestry and farming activities result in disturbed or bare ground that is vulnerable to weather erosion. The silt laden run-off, plus site debris and other pollutants, often contaminates surrounding land, rivers, streams, lakes and drains – resulting in significant environmental diffuse pollution and potentially costly fines.

However, due to the on-going nature of such work, it is generally not possible to protect exposed surfaces until the project is complete. So storm water from such sites represents a major non-point source of diffuse water pollution in the UK.


  • Top tying-off + tensioning ribbon
  • Fibrous weft yarn provides excellent filtration (Premium)
  • Proven performance
  • Traps harmful silt via settlement and filtration
  • Purpose designed for application
  • High tensile strength
  • UV Stabilised
  • Non fraying reinforced edges
  • High quality weave
  • Exceptional balance of permeability vs filtration

The Solution – Silt Fence Installation

Terrastop™ Premium is a special, high quality, permeable, technical filter fabric for stormwater surface runoff pollution management. Terrastop™ can be installed as an entrenched vertical entrapment fence, and is designed to intercept and detain stormwater run-off, trapping harmful silt through settlement and filtration before it leaves the site.

The benefits of the silt fence installation are increasingly becoming recognised in Britain: The Environment Agency/SEPA Pollution Prevention Guidelines (PPG5) now recommend the use of silt fences to reduce silt transport from exposed ground and stock piles; and research at The James Hutton Institute, using Terrastop silt fencing, demonstrated that even after post-harvest contour grubbing of potato fields an estimated 80 tonnes of soil containing 60-70 kg phosphate-P contaminants was trapped from a 17ha field [Dr Andy Vinten].

Silt fences have also been used extensively in other countries for many years, and their proven performance (Intercepting up to 86% of suspended solids [Horner et al. 1990]) has made them a standard Best Management Practice on a diverse range construction projects, while in-depth research and practical experience has identified the most important characteristics for effective results.

Kirsty Liddon’s Edinburgh University Dissertation “Prevention of Diffuse Pollution from Active Forestry Harvesting Sites:” concluded “the Hy-Tex [Terrastop Premium] material appears to be the most suitable material for use as sediment retention as it has the most consistent performance between differing soil types retaining the highest volumes of sediment for both gley and peat solutions.”

Key Features

Based on this invaluable knowledge, Terrastop™ Premium has been designed to exceed the highest standards, incorporates many unique features, and is also “CE Mark” certified for erosion control applications in accordance with new mandatory
European requirements

The Purpose of a Silt Fence
The primary purpose of a silt fence in Ireland is to control soil erosion by:

Sediment Containment: Silt fences act as a barrier that intercepts and captures sediment-laden runoff water before it can escape the construction site or disturbed area.
Silt fences are an essential component of erosion control measures required to meet these regulatory standards.

Preserving Natural Habitats: Silt fences help prevent the degradation of local ecosystems by reducing the influx of sediment into sensitive habitats, such as wetlands and watercourses. This preservation of natural environments is crucial for Ireland’s biodiversity.

Type 3 Silt Fence in Ireland

Type 3 silt fences are a specific category of silt fences commonly used in Ireland. These silt fences are designed to meet stringent quality and performance standards to ensure effective erosion control. Key characteristics of Type 3 silt fences may include:

Enhanced Filtration: Type 3 silt fences are designed with improved filtration capabilities to capture even smaller sediment particles, providing a higher level of protection to water bodies.

Durability: These silt fences are built to withstand the often unpredictable Irish weather conditions, ensuring they remain effective during periods of heavy rain and strong winds.

Compliance: Type 3 silt fences adhere to Irish environmental regulations, making them a suitable choice for construction and development projects seeking to meet legal requirements.

Reliability: Given the significance of erosion control in Ireland, Type 3 silt fences are a reliable choice for ensuring sediment containment and preventing off-site pollution.

Data Sheet & Guidelines

Terrastop Data Sheet

Terrastop Installation Guide

Data Sheet & Guidelines

Laing O’Rourke December 2017

National Grid June 2008

To enquire about this product – call us on 01 8665676 / 087-9367065 or contact us here