Moss for green infrastructure

Moss wall
Area characterisation: 

Green roofs are a potential way to reduce the effect of climate change in cities. Urban storm-water management needs new innovative ways to handle the increased risk of storm-water floods. Also, urban heat island effect can be reduced with urban green infrastructure. Applying green roofs can be difficult especially when retro-fitting them in old buildings or structures with low load capacity. Ultra-thin moss roofs are a promising new feature that are low maintenance and extremely light weight but can have the same benefits as other green roof types.

Slideshow:

Moss is added into loose brick wall Moss wall with a “rolling stone” theme in Jätkäsaari Helsinki A bus stop with moss roof in the Natural history museum Helsinki. A set of moss roofs in Lohja Overview on the Lohja moss roofs Small storage house moss roof in Helsinki.
Objective: 

Objective of these prototype moss installations was to find out the possible challenges of using moss in different locations and structures. We need to know what type of moss can be used and what are the actual costs of building moss green roofs and walls.

Actions: 
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A moss-brick wall was built in Helsinki Jätkäsaari. Structure of the wall was loose stacked bricks with minimum of plaster used. Carefully selected mosses were added into the holes. Small amount of water soluble glue was added into the holes. Moss wall is carefully moisturized

Potential impacts/benefits: 

Here the challenges addressed were climate resilience, water management, green space management and potential for economic opportunities and green jobs.

The expected impacts of wide spread use of ultra-thin moss roof solutions include:

  • Reduce costs for water treatments
  • Improve water quality
  • awareness &knowledge about NbS
  • Increase willingness to invest in NbS
  • Creation of jobs relating to construction & maintenance of NbS
  • Increase biodiversity
  • Increase quality and quantity of green and blue infrastructure
  • Increase connectivity and functionality of green and blue infrastructure
  • Greater ecological connectivity across urban regenerated sites
  • Carbon sequestration and storage
  • More energy efficient buildings
  • Reduce load to sewer system
  • Increasing infiltration
  • Reduce run-off
  • Flood peak reduction
  •  Reducing temperature at meso or micro scale
  • Increase infiltration and water storage
Transferability of the result: 

Findings from these test roofs can be later used for upscaling the process of planning and building ultra-thin moss roofs. Wider use of green roofs and especially moss roofs needs actions like Helsinki city’s green roof initiative (http://scandinavian-green-roof.org/news/new-green-roof-policy-for-the-ci...)

Lessons learned: 

We found that building ultra-thin moss roof is cost-effective way of building green roofs. We can apply moss roofs to places that were previously unreachable, and the maintenance of moss roofs is care free. 

Financing: 

Funding for each moss roof came from the owner of these buildings.

Contacts: 

Juhamatti Niemi-kapee

Goals:

  • Enhancing sustainable urbanization
  • Developing climate change adaptation

NBS Actions:

  • Urban regeneration through nature-based solutions
  • Nature-based solutions for improving well-being in urban areas

Keywords:

Biodiversity, Changing image of the urban environment, Climate change, Ecosystem services, Greater ecological connectivity across urban regenerated sites, Green infrastructure, Landscape, Nature-based solutions, Northern, Resilience, Stakeholders, Think Nature, ThinkNature, Urban, Creation of green jobs relating to construction & maintenance of NBS, Flood peak reduction, Improve connectivity and functionality of green and blue infrastructures, More energy efficient buildings, Improve water quality, Increase Biodiversity, Increasing infiltration, Increase quality and quantity of green and blue infrastructures, Increase awareness of NBS solution & their effectiveness and co benefits, Reduce run-off, Increase stakeholder awareness & knowledge about NBS, Developing climate change mitigation, Increase willingness to invest in NBS, Enhancing sustainable urbanisation, Reduce costs for water treatments

Client:

TA Companies (moss wall); Private home owners (moss roofs); Natural history museum (bus stop)

Design team:

PhD Student Juhamatti Niemi-kapee (University of Helsinki)

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