Our approach
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Due to the diverse nature of green walls, there are an equally diverse selection of materials and construction methods that are possible to utilise in the construction of these walls.We have opted to pursue a recycled materials approach to the green wall, and have focused on a base structural material of used wooden pallets. Wood is a natural and sustainable resource, and recycling an existing product, means an extended useful lifespan of an existing product and/or its materials.
As such, our approach has been to focus on a modular green wall utilised as an exterior standalone unit at the base of the wall, but due to its modular nature, could be stacked (with adequate support and/or fixings). The approach is fairly low tech and able to be easily retrofitted to existing wall structures.
Why use Pallets?
The recycling and reuse of wooden pallets has increased over the years, but there is still substantial waste when pallets have reached the end of their useful life. Pallets are a ubiquitous product which is made from a precious raw resource. (https://www.palletcentral.com/news/393334/Study-Shows-95-of-Wooden-Pallets-are-Recycled.htm)
While reducing or eliminating the use of wood for pallet manufacture is being explored, with alternative materials such as recycled plastic for pallet production, up to 95% of pallets are still being produced from wood. https://www.theguardian.com/sustainable-business/2017/may/22/recycling-in-australia-is-dead-in-the-water-three-companies-tackling-our-plastic-addiction
Pallets So the need for reuse and recycling of these products continues to be an important part of their life-cycle.
Pallets are a widely available recyclable and recycled material, easy to work with and allow for a retrofitted, grass roots public approach to environmental sustainability in design.
Potential issues?
Given the fact that a green wall is permanently damp, we acknowledge that a wooden structure is impermanent (likely lasting four to five years if untreated). There are potential ways to improve the performance and waterproof the structure, including lining with plastic or coating with waterproofing sealant or paint. Additionally longevity can be increased through repair or replacement of rotted boards, particularly in a standalone use case, without risking damage to the structural wall of the building.
The pallet's method of construction, treatment and use history is also important to take into account.
Particularly if the pallet is used for growing food producing plants.
- Pallets can be made of softwood or hardwood, which will affect their longevity.
- They can be heat treated or chemically treated.
- They could have been used to store toxic substances or chemicals.
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