Porous Block Paving
An introduction to new Building Regulations

Porous Block Paving

Block paving can be used to create driveways, patios and paths.

Standard Structures consists of 100mm Sub Base, a 50mm thick compacted Class M Zone 2 grit/sand, an Edging course of 100mm concrete bed and haunch topped with 65mm Concrete Paviours.

Porous paving is designed to allowing surface water to pass between blocks into a specially calculated sub-base without compromising the structural performance of the driveway.
Where installed with the correct sub-base, it may be laid in front gardens without the need to obtain planning permission.

Porous Structures consists of A Capping Layer above soil, depth to design on ground conditions, Washed 20mm Aggregate, depth to design on ground conditions, Washed 6mm Aggregate to 50mm depth, 65mm Concrete Paviours which have a permeable joint filled with 6mm washed Aggregate.

This is sufficient to drain excess water in the sub soil and not onto the highways, thus avoiding planning permission for the new driveway.

Additional drainage could be considered. We use ACO drains.

There are many different types and styles of ACO drains but they all work in the same way, when laying your paving you will need a fall of 25mm per meter falling into the ACO drain, the ACO drain has an underground channel that is connected to a soak away releasing the water into the ground.
Alternately the water can be directed into flower beds or French style drains using shingle or gravel.

Channelling excess water.

Kerbs and edging are a great way of finishing off all types of paving, channelling water into ACO drains and retaining small flower bed. Additionally they can also be used to create steps.

Finally. properties which have poor drainage and excess water on site may well need a retaining wall to stop soil movement.

Retaining walls are used when your desired ground level leaves unsupported masses of soil that need retaining, there is many different types of retaining walls the most common is a H block wall, this is a very strong and affective retaining wall constructed from 9inch hollow concrete blocks that are filled up with concrete once wall has set, you can face this kind of wall with bricks, stone or it can be rendered.

Other types of retaining walls can be constructed for treated timber such as railway sleepers and telegraph poles for a more natural effect.

Chris Keeler - We love making the best of our clients property and the satisfaction that you will get from having the perfect driveway of garden of your choice. All our driveway and groundwork construction materials are manufactured to BS 6717, the British Standard for precast materials.