Tarmac used to consist of a mixture of tar and aggregate, however is now more Asphalt or Bitumen which is an oil based product
102 million tonnes of Bitumen are used throughout the World annually and over 85% is used in the construction of roadways.

Traditionally, resin bound stone installations have been laid on a base of permeable tarmacadam or asphalt, also known as porous or pervious, though in the trade it is almost always referred to as open-graded tarmacadam and in simple terms is merely the standard hot-mix product with reduced sand or fines (finely graded aggregates) which enables water to drain through it.

The reduced fines in the permeable tarmacadam mix provides interconnected but stable air pockets within the layers of tarmacadam which allow rainwater to flow through it. To be effective however, permeable tarmacadam relies on the aggregate sub-base layers also being porous whilst still supporting the tarmacadam.

The issue is however, that Bitumen or Asphalt is not kind to the environment or more specifically to the Aquifer or water table in to which the rainwater drains in the case of permeable surfacing.
Bitumen consists of:

• saturates, saturated hydrocarbons, the percentage of saturates increases on a pro-rata basis with the addition of heat or warmer weather
• Naphthene aromatics, consisting of partially hydrogenated polycyclic aromatic compounds.
• Polar aromatics, consisting of high molecular weight phenols and carboxylic acids
• Asphaltenes, consisting of high molecular weight phenols and heterocyclic compounds.
Not great when you put this in the water table.

This is why BREEAM are now not accepting open grade Tarmac, Bitumen or Asphalt as a sustainable base for Resin bound stone applications 

Our EcoGrid system provides a carbon neutral alternative that offers greater load bearing opportunities with a cleaner and easier to fit sub-base that COSTS NO MORE TO FIT. It is also:

RAL approved
CE approved
DIN 38412 – Neutral for the environment
DIN 4102 – Approval emergency access routes, fire resistance
DIN 1072 – Approval for 20 tonne axle load, driveways, road extensions, bridges
DIN IN ISO 124 and B125 – Approval for car parks, access roads & storage areas
Point axle loading up to 20 T/m², DIN 1072:1985
UV-resistant, certified DIN EN 60068-2-5
Heavy-duty, tried and tested DIN EN 124:2011
Environmentally safe, tested OECD 202:2004
Factory warranty: 20 years from purchase date
NATO certified E50 – MOD / 9330-99-858-1406
TÜV Certification.


Take a look at our guide here

Please feel free to contact us for further information, a sample or some direct to site delivered costs.
0151 639 4281 (4 lines)