High compression-resistant backfill ULTIBED TRENCHFILL

for sub-pavingfor public worksfor roads

Overview
Ultibed Trenchfill is a soil binder that enables soil from utility trench excavation to be processed on site and reused as a structural reinstatement material. The treated material delivers significantly greater strength than traditional methods (notably described as three times greater strength than Type 1 aggregate) and offers operational and sustainability benefits by reducing material and waste disposal needs.

Compliance & waste status
Meets the requirements of the Specification for the Reinstatement of Openings in Highways (SROH) Appendix A9 covering Alternative Reinstatement Materials as a structural material for reinstatements (SMR). The Environment Agency’s Definition of Waste (DoW) Service has confirmed that, where excavated materials are treated for immediate, compliant reuse using Ultibed Trenchfill SMR, they are not classified as waste under the SWUK Protocol (October 2025). Ultibed Trenchfill enables hazardous materials such as tar-bound planings to be safely re-used as a trench fill material and can be used in compliance with the latest WM3 standards.

Where it can be used

• Recycling soil from utility street works — on-site processing and reuse of excavated material to create a structural reinstatement material.
• Soil binder for bedding flagstones and block pavers — provides a stable, structural base for paving and slabs.
• Soil binder for road or footpath reinstatement — can be used as a combined sub-base and binder course, reducing the required asphalt layer by up to 50%.
• Structural material for utility reinstatement — utility contractors can stabilise excavated soil to form a durable lower layer for reinstatement.

Key benefits

• Recycling of site waste: allows up to 100% of excavated trench material to be re-used, reducing waste and transport impacts.
• Preventing failure and defects: improves density and stability of layers to reduce slumping and long-term defects.
• Increasing strength and stability: specialist binder improves bonding and can increase strength/density significantly (the product literature cites strength increases up to 600% in treated soils).
• Lower cost reinstatement: reduces material and disposal costs and associated transport requirements.
• Moisture control: when mixed with soil it forms a non-flowable stabilised material (NSFMR) that dries out soil, reduces excess moisture and enhances compaction.
• More sustainable reinstatements: reduces embodied carbon by avoiding manufacture and transport of new aggregates and asphalt and helps avoid future emissions from rework.
• Compatible with packed cold-lay asphalts: can be used with packed cold-lay asphalts (examples referenced by the manufacturer for high-quality reinstatements).

Materials compatibility
Ultibed Trenchfill can be mixed with a wide range of materials including soil, aggregate, tar-bound planings and clay to produce a stabilised structural material for reinstatement.

Practical notes
When mixed and compacted the product produces a non-flowable stabilised material suitable for permanent reinstatements; after compaction a cold-lay asphalt can be laid to complete the reinstatement quickly. The product is designed for permanent repairs but can be removed if required.

Characteristics / technical specifications

• Denomination: Ultibed Trenchfill (soil binder / structural reinstatement material)
• Performance: Typical treated material has around three times the strength of Type 1 aggregate; manufacturer literature cites potential soil strength increases up to 600% in treated zones.
• Reuse rate: enables up to 100% of excavated trench material to be re-used on site when processed correctly.
• Standards & compliance: Meets SROH Appendix A9 (Alternative Reinstatement Materials) as an SMR; aligned with WM3 and confirmed DoW reuse position under SWUK Protocol (October 2025) when applied as described.
• Applications: sub-base and binder course for road/footpath reinstatement, bedding for flagstones and block pavers, structural material for utility reinstatement, recycling soil from trenches.
• Mixable materials: soil, aggregate, tar-bound planings, clay.
• Behavior: produces a non-flowable stabilised material for reinstatement (NSFMR); reduces excess moisture and enhances compaction and density.
• Installation: compacted treated material can accept packed cold-lay asphalt for final surfacing.