Durafalt® is our 40/60 penetration grade stone mastic asphalt (SMA) thin surfacing system (TSCS). It is produced in accordance with the Specification for Highway Works (SHW) 941 and was developed for motorways and other major highways.

Durafalt uses high quality, high polished stone value (PSV) aggregates. It provides excellent levels of noise and spray reduction, while yielding high levels of skid resistance with a texture that is retained throughout its service life. Durafalt is also resilient enough to stand up to heavy traffic yet provide an ultra-smooth ride.

Durafalt can also be produced using Heidelberg Materials’ era 140 warm mix process, meeting the requirements of current National Highways major network specifications.

Installation is by Heidelberg Materials’ contracting division or licensed laying contractors in line with Heidelberg Materials’ own installation manual in accordance with SHW Clause 942. Durafalt comes with a 5-year guarantee underwritten by the contractor.


  • 5-year performance guarantee
  • Excellent resistance to deformation
  • Enhanced ride quality
  • Reduced noise
  • Excellent spray reduction
  • Reduced CO2 when supplied as era 140
  • 100% recyclable

Also available with the following options:


  • Highways/motorways
  • Major projects
  • Major local authority networks

Durafalt technical data

Coarse aggregate

Los Angeles abrasion value 30 max
Aggregate abrasion value As specified in SHW
Clause 942 (Appendix 7.1)
Flakiness index 20 max 
Nominal sizes 10mm; 14mm
Binder High performance polymer modified bitumen (PMB)
Layer thickness
Details of constituent quality and layer thickness shown below
10mm nominal size 25 – 50mm
14mm nominal size 35 – 50mm
Surface texture (on installation)
10mm nominal size

1.1 – 1.6 mm

14mm nominal size 1.3 – 1.8 mm
(All NH Clause 942 Level 3)

Road and laboratory test results

Torque bond Typical figures +800 KPa
Noise reduction NH Clause 942

Material property

Test specification Typical result
*Design void content BS EN 12697-6  Vmin 1.0% – Vmax 5.0%
Water sensitivity BS EN 12697-12 Method A (ITSR)
BS EN 12697-23
≥ 80%
RTPD (wheel tracking) BS EN 12697-22 Procedure B
WTS in Air
≤ 0.6mm/103

*Where specified in appendix 7/1.

Please see asphalt product matrix for further information or contact technical: