Street Works Bituminous Layer Thickness Compliance Guidelines

2nd Edition NIRAUC Reinstatement Code(In accordance with the NIRAUC Preferred Methods)

Type 1 Roads Reinstatements

Specification Absolute Minimum

40mm of either 30/14 35mm minimum ofHRASC or 10mm CGSC either 30/14 HRASC or

10mm CGSC

350mm 310 mm of either 50/20 335mm 300mm minimum of either HRABC or 20mm DBC Minimum 50/20 HRABC or 20mm DBClaid in accordance to Table laid in accordance to TableA2.2 of the Reinstatement A2.2 of the ReinstatementSpecification Specification

Type 2 Roads Reinstatements

Specification Absolute Minimum

40mm of either 30/14 35mm minimum ofHRASC or 10mm CGSC either 30/10 HRASC or

10mmCGSC

285mm 245mm of either 50/20 270mm 235mm minimum of eitherHRABC or 20mm DBC Minimum 50/20 HRABC or 20mm DBClaid in accordance to Table laid in accordance to Table A2.2 of the Reinstatement A2.2 of the ReinstatementSpecification Specification

Surface Course Binder Course & Base Granular Sub Base

Upper Layer Tolerance : - There is no upper layer thickness tolerance on the bituminous layers. The compacted thickness of all individual ‘lifts’ of bituminous mixtures should, however, be in accordance with the appropriate materials compacted Lift Thickness in Table A2.2 of the Reinstatement Specification.

Street Works Bituminous Layer Thickness Compliance GuidelinesVersion 2 Issued 21/03/20071

2nd Edition NIRAUC Reinstatement Code(In accordance with the NIRAUC Preferred Methods)

Type 3 and 4 Roads Reinstatements

Specification Absolute Minimum

40mm of either 30/14 35mm minimum of HRASC or 10mm CGSC either 30/14 HRASC or

10mm CGSC

100mm 60mm of either 50/20 100mm 65mm minimum of eitherHRABC or 20mm DBC Minimum 50/20 HRABC or 20mm DBClaid in accordance to Table laid in accordance to TableA2.2 of the Reinstatement A2.2 of the ReinstatementSpecification Specification

Surface Course Binder Course & Base Granular Sub Base

Upper Layer Tolerance : - There is no upper layer thickness tolerance on the bituminous layers. The compacted thickness of all individual ‘lifts’ of bituminous mixtures should, however, be in accordance with the appropriate materials compacted Lift Thickness in Table A2.2 of the Reinstatement Specification.

Alternatives for Small Carriageway Reinstatements

Permanent Surface Course material may be laid in place of a permanent binder course material at base (roadbase) and/or binder course level. The compacted thickness of all individual ‘lifts’ of bituminous mixtures should be in accordance with the appropriate materials compacted Lift Thickness in Table A2.2 of the Reinstatement Specification.

Street Works Bituminous Layer Thickness Compliance GuidelinesVersion 2 Issued 21/03/20072

2nd Edition NIRAUC Reinstatement Code(In accordance with the NIRAUC Preferred Methods)

Footways Reinstatements

Specification Absolute Minimum

30mm of either 15/10 25mm of either 15/10HRASC or 6mm DSC HRASC or 6mm DSC

80mm 50mm of either 50/20 70mm 45mm of either 50/20HRABC or 20mm DBC Minimum HRABC or 20mm DBClaid in accordance to Table laid in accordance to TableA2.2 of the Reinstatement

OR Specification Absolute Minimum

60mm of either 15/10 60mm minimum ofHRASC or 6mm DSC either 15/10 HRASC

or 6mm DSC (see Note below).

Surface Course Binder Course & Base Granular Sub Base

Note : - The minimum depth shall be 150mm where there is a domestic vehicle crossing or regular vehicle over-running/parking. Commercial vehicles crossing shall be reinstated as a Type 4 road.

Upper Layer Tolerance : - There is no upper layer thickness tolerance on the bituminous layers. The compacted thickness of all individual ‘lifts’ of bituminous mixtures should, however, be in accordance with the appropriate materials compacted Lift Thickness in Table A2.2 of the Reinstatement Specification.

Alternatives for Small Footway Reinstatements : -

a) A CBM3 sub-base of 100 mm thickness.b) A 50/20 HRABC or 20mm DBC of 40 mm thickness. c) Three layers of 15/10 HRASC or 6mm DSC may be laid to a thickness of 100mm, as a

combined sub-base, binder course and surface course.

Version 2 Issued 21/03/20073

Extract from the 2nd Edition of the NIRAUC Specification for the Reinstatement of Openings in Roads

Compacted Lift Thickness

The compacted thickness of all individual litfs of reinstatement mixtures, within all reinstatements structural layers, shall be in accordance with the Table A2.2.

Table A2.2 Compacted Lift Thickness (mm) – Bituminous Mixtures

Compacted Lift Thickness (mm)

Material Minimum at any point

Nominal Lift Thickness

Maximum at any point

6mm DSC 15 20 to 30 40

10mm CGSC 25 30 to 40 50

15/10 HRA SC 25 30 to 40 50

30/14 HRA SC 25 30 to 40 50

10mm SMA SC 20 25 to 35 40

14mm SMA SC 30 35 to 45 50

10mm Porous Asphalt 25 30 to 35 40

20mm Porous Asphalt 40 45 to 60 65

50/20 HRA BC 40 45 to 80 100

14mm SMA BC 30 35 to 45 50

20mm SMA BC 40 45 to 55 60

20mm DBC 40 50 to 100 110

Version 2 Issued 21/03/20074