HDGG

CHALLENGE

The first of its kind for Quebec, the “living street” required a paving grid that would provide multi-purpose access along the street whilst also allowing for the aesthetically pleasing natural look to be maintained. 

A woonerf is a living street that is traditionally implemented as a traffic calming aid and to enforce low speed limit areas. They are often shared space streets where equal priority is given to all modes of transportation including automobiles, bicycles and pedestrians; usually with separate rights of way. The province of Quebec was looking to do a “pilot project” in the city of Montreal to create a woonerf that would not only provide the required access, including disabled access but that would also have a long-lasting beneficial impact on the environment. They were looking for an environmentally friendly ground reinforcement product which would provide the strength and durability required for a heavily used area. As a “living street”, the product needed to allow the growth of natural vegetation and contain no harmful preservatives which could affect the environment in which it is placed. 

The harsh weather conditions in Quebec also needed to be considered. With such extreme conditions in both winter and summer, the material needed to withstand the temperature fluctuations. Ground reinforcement products traditionally used such as concrete are susceptible to cold crack in winter as it is a porous material. As a requirement, the desired product was to absorb only limited heat in order to promote growing vegetation. The only suitable material for a project with such challenging conditions was hanit®’s recycled plastic heavy duty ground girds, with their durability and environmental credentials meeting the requirements.

SOLUTION

hanit®’s Heavy Duty Ground Grids are manufactured from a blend of high-quality recycled plastic polyolefins extracted from post-industrial and post-consumer mixed waste plastics. Heavy Duty Ground Grids have a high impact resistance which makes them suitable for all vehicle access. They have an interlocking system which improves stability and also allows for quick and simple installation. As the woonerf needed to provide numerous different access levels it was important that the Heavy Duty Ground Grids were versatile. They can be filled with either grass, seed/topsoil or gravel. For this project, wheelchair access was provided through a gravel filled pathway.

The rest of the “living street” was mostly completed with grass filled areas. As hanit® products transfer limited amounts of heat, they dry out the soil less than concrete. This works as a benefit to the vegetation growing through the grids. Recycled plastic material is not porous and therefore does not absorb any moisture. This gives added benefits in the winter as when absorbed moisture freezes in concrete it causes cold crack. Their open structure also allows for quick infiltration of any rainwater into the ground allowing for sustainable urban drainage requirements to be met.

hanit® Heavy Duty Ground Grids are strong and durable and require no maintenance. They are not affected by weathering and decay; therefore once in place, they have a much longer lifespan than any other competing products.

Made from 100% recycled material, the woonerf has been an extremely sustainable project. Providing Montreal with a living street has not only added more vegetation to the area but also allows the city to contribute to an environmentally responsible sustainable urban drainage solution. As the products are chemically inert they do not affect the environment and are harmless to all flora and fauna. In total the project has used 8,500 units of Heavy Duty Ground Grids. This equates to almost 77 tonnes of recycled plastic waste which has been saved from going to landfill.

The woonerf has been an extremely well celebrated project that has won prizes for its conception and green initiatives. 

“I recommend Les Dalles Vertes (Heavy Duty Ground Grids) to all my clients. We laid out nearly 30,000 square feet of these pavers for the Woonerf project and it took us half the time and resources that were required to install the old concrete grass pavers." - Tony Scirocco, Ventec