Waterwise V2 Permeable Paver

Designed to be used in the construction of PICPs (permeable interlocking concrete pavements), the Waterwise V2 merges permeability with superior structural performance.

The block features a specially designed double nib system which provides superior structural performance and adequate spacing between the pavers to allow water to drain through the jointing gaps. Furthermore, they ensure enough space between the pavers to accommodate the correct jointing material for permeable pavements as specified by the Interlocking Concrete Paver Institute.

At 80mm thick and with specially designed nibs, the Waterwise V2 permeable paver is suitable for residential, commercial and industrial applications. The simplistic rectangular shape creates a functional and aesthetically pleasing paved surface.

Interlocking double nib system

The double, “gear like” nib system provides superior interlock. The nibs interlock with adjacent blocks throughout the depth/thickness of the blocks; resisting horizontal displacement and turning movements, providing a structurally sound permeable paving system.

Nibs create voids for permeability

The double nib system creates a 8mm gap between the pavers which can accommodate the correct jointing material, while allowing water to drain.

80mm Thickness

The perception exists that 80mm thick pavers are only intended for heavy vehicular traffic. Because permeable pavements are grouted with stone and not sand, as with conventional pavements, the increased aspect ratio (ratio between length and thickness) creates improved rotational interlock between pavers. The 80mm thickness of the Bosun Waterwise V2 therefore complies with all accepted installation specifications and guidelines.

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Product Name

Waterwise V2 Permeable Paver

Dimensions 200mm x 100mm x 80mm
Thickness 80mm
Mass per paver 3.73 kg
Pavers per m² 50
SANS 1058 : 2021 approved
m² per pack 9.6m²
Pavers per pack 480
Weight per pack 1475kg
Grass Blocks Technical Information

Basic colour options for this paver:


Other colours could be available on request.

Consult your local representative for more information on other colour options.
*T’s & C’s may apply.

When considering permeable paving, it’s important to understand the principles and follow them correctly. Like most other things in life – if you don’t do it properly, rather don’t do it at all, as you will waste your money.

What is permeable paving?

Permeable paving is when special paving blocks with larger jointing gaps are installed on single size stone base layers in order for water to infiltrate the earth instead of running off the paving.

Why would you install permeable paving?

The local authorities want you to deal with water from your own property and not let it run into the already struggling storm water system.

You might be conscious of using water wisely. Just as you can harvest water from roofs, you can harvest water from pavements.

What is different when comparing permeable paving and conventional paving?

Permeable paving

Conventional paving

Grouting gaps are larger than 6mmGrouting gaps are smaller than 6mm.
Grouted with single sized stone.Grouted with fine sand.
Bedded on single size stone.Bedded on river sand.
Base is constructed with single size stone. (Larger than what was used in the bedding).Base is constructed with a material like G5, that compacts well.
Blocks are 80mm thick in order to have enough rotational interlock with the single size stone grouting.Blocks can be 50 or 60mm thick as sand used for grouting creates enough friction for sufficient rotational interlock.
A sub-base reservoir can be constructed with single size stone, larger than the stone used for the base.A sub-base is rarely installed under the well compacted base.
In certain designs, the soil subgrade isn’t compacted to ensure permeability of the subgrade.The soil subgrade is compacted to the point of refusal.

What are the most common mistakes when it comes to permeable paving?

  • Pavers are grouted with sand and installed on a sand bed. Such a system will clog very quickly. We recommend using Resiblock Envirofix which works as a joint stabiliser designed to stabilise the jointing medium within concrete block paving permeable paving systems (CBPP) whilst allowing free flow of water via the joint.
  • Many “permeable pavers” have design flaws. Having small grouting gaps with bigger holes where the water should flow through simply doesn’t work. Such a system is clogged almost instantaneously. (Bosun made this mistake too, but these products have been discontinued.)
  • 80mm thick pavers are too expensive. In the bigger scheme of things, the pavers are a small part of a permeable system’s cost. It is not about the thickness – it’s about the interlocking capabilities when it comes to stone. (Bosun made this mistake too, but these products have been discontinued.)
  • Geotextiles are used between the bedding and base layers. This is technical, but geotextiles are sediment traps. The secret is in the selection of the right aggregates.
  • Aggregates are not cleaned prior to use. Fine aggregate dust can potentially clog the system. 
  • Construction is not properly supervised.

Does permeable paving actually work?

Without a doubt. There are thousands of examples throughout the world. Permeable pavements are taking preference in more developed countries.

Is it difficult to design a permeable pavement?

If you understand the principles around permeable paving, the design is not difficult. Furthermore, Bosun has design software available that is customised for South African conditions. Click here to learn more – https://www.bosun.co.za/products/paving/permeable-paving/permeable-design-pro/