All our aggregate and asphalt manufacturing sites: Croaghan, Ballymena, North Down, Moneymore, Carmean, Carrickmore, Mountfield, Ballintra and Mallusk together with our civil engineering and road contracting operations, are accredited by BSI as complying with ISO 9001.
Certificate No. FM 36203.
Our concrete roof tiles are under a separate BSI certificate.
Certificate No. FM 28416
National Highway Sector Schemes
We are also accredited by the BSI as meeting the requirements
of the following schemes.
13 The supply and application of surface treatments to road surfaces
14 For the quality management of the production of asphalt mixes
16 The laying of asphalt mixes
Kitemark No. KM 28191.
All Concrete roof tiles are accredited under the
British Standards Institute (BSI) Kitemark Scheme.
All our ready mixed concrete production depots are accredited
under the Quality System for Ready Mixed Concrete.
Nortstone Materials Certificate number M 040.
Northstone Products Certificat number M 040/01/3
British Board of AgrÃ©ment Highways Authority Product Approval Scheme (BBA HAPAS)
Our 14mm Maxphalte® SMA Thin Surfacing System,
for both manufacture (all coating plants) and installation,
is BBA approved.
Certificate No. 03/H085
Our Special Products Team is approved
by the BBA as installers of Prismo's Zebraflex Standard
and Type 1 High Friction Surfacing Systems.
Approved Installer Number 3586.
In compliance with the Directive 89/106/EEC of the Council of European Communities, 21 December 1988, our bituminous products (asphalt concrete and hot rolled asphalt) are manufactured under a Factory Production Control system that is independently certified by the BSI as complying with the requirements of EN 13108. Certificate No. 0086-CPD-560260.
As per these requirements, our quarry products are CE Marked.
Our aggregate and asphalt manufacturing sites, and our civil engineering / road construction, and our roof tiling operations, are accredited by the BSI as complying with the requirements of the OHSAS 18001 safety standard. Certificate No. OHS 514139
ISO 14001 Environmental Management
All our activities and our production sites are accredited by BSI as complying with ISO 14001.
Northstone Materials Certificate No. EMS 54159
ISO 50001 Energy Management
The manufacture, processing and distribution of a range of our products, including the following: crushed aggregate, sand (from pits & Lough Neagh), ready-mix concrete, production of concrete roof tiles, blocks, lime products and coated bituminous materials, are accredited by BSI as complying with ISO 50001.
Certificate No. ENMS 575240
Investors in People
We are Investors In People since 2001
We are members of ConstructionLine.
Reference Number: 5486
National Federation of Roofing Contractors NFRC
We are a member of The National Federation of Roofing Contractors.
The Sports Turf Research Institute
We are a member of The Sports Turf Research Institute, whose laboratories provide independent testing, analytical and evaluation services, with impartial advice, to the golf course and sports turf industries.