2024
Halifax, West Yorkshire
Calderdale Council
Piletec Geotechnical Ltd
WSP
A629 Exley Bank
Challenge
Piletec Geotechnical Ltd invited Maccaferri to provide a soil nail-facing system for topsoil retention and erosion protection on a soil-nailed slope at Exley Bank, part of the A629 Calderdale Phase 1B project. The slope would be 26 m long, with heights ranging from 6.8 m at its peak to 2 m at the lowest point. A 1.5 m masonry wall was to be constructed at the toe, with a 60° soil-nailed slope above it. The design required a topsoil retention system to act as a growing medium for vegetation while providing durable erosion control.
Solution
Project designers WSP chose Maccaferri’s Geomac System, an innovative slope stabilisation and erosion protection method. Geomac mattresses are large wire cages (3 m × 2 m × 0.23 m) lined with Mactex H2800 filter fabric, filled with stone and soil, and topped with a MacMat® R lid. Once installed and seeded, they form stable panels that encapsulate topsoil, resist erosion, and encourage rapid vegetation growth. The masonry wall base was backfilled with no-fines concrete to support the baskets. Sisk, the main contractor, led the project, with Piletec Geotechnical Ltd installing the Geomac system and Maccaferri supplying all materials. Approximately 250 m² of Maccaferri Geomac erosion control mattresses were installed at Exley Bank, delivering a robust and long-term erosion protection system that also retained topsoil to encourage vegetation establishment. The completed slope was structurally stable, visually attractive, and fully aligned with project requirements, combining engineering performance with an environmentally sensitive approach. This collaborative effort between WSP, Sisk, Piletec Geotechnical Ltd, and Maccaferri successfully addressed the technical challenges of the site while enhancing its natural appearance.
Used Products



