Mark Liebman’s new shed with its green roof (Photo: Lis Bastian)
Inspired by Norwegian sod roofs, Blackheath engineer Mark Liebman built a green roof on his shed. This innovative design significantly reduced stormwater runoff during 2024’s heavy rains, potentially by 65 per cent, while also providing excellent insulation and attracting wildlife. The family now fondly refers to their shed as their mini Viking Long House!
Key Points:
Inspired by sod roofs in Norway, Blackheath engineer Mark Liebman built a green roof on his garden shed to manage stormwater runoff and provide insulation.
The green roof significantly reduced stormwater damage during heavy rains in 2024 (potentially by 65 per cent), attracts wildlife, and provides excellent insulation (R6), creating a comfortable space year-round.
Building a green roof requires careful planning and structural engineering due to the substantial weight of the soil, water, and even potential snow load.
On his honeymoon to Norway many years ago, Blackheath engineer Mark Liebman was inspired by the cabins he saw, built with green ‘sod’ roofs. These roofs had been providing insulation for centuries in a very cold climate.
As a civil engineer specialising in water management, Mark was particularly interested in how a green roof could also reduce the impact of heavy rains on hard surfaces and potentially reduce stormwater runoff.
When the opportunity arose to rebuild his garden shed last year, he decided to explore recreating what he’d seen in Norway. Visiting him recently it was clear that he couldn’t be happier with the result.
Mark Liebman sitting on his green roof. (Photo: Lis Bastian)
By every count the green roof has met and exceeded his hopes and expectations.
Not only did the roof survive the multiple, severe downpours that caused so much damage throughout 2024, including reducing stormwater damage to the rest of his yard (possibly by as much as 65 per cent, according to research into green roofs), it is also now teeming with life, as insects, birds, and his family, flock to spend time in this elevated garden.
The irrigation of the roof garden increases cooling in Summer (Photos: Mark Liebman)
The shed’s roof provides the equivalent of R6 insulation, and, with evaporation of the garden’s irrigated water in summer, is probably creating even more cooling. This helps save money on heating and cooling and makes spending time in the shed very comfortable, even in extreme weather.
It has now become the central feature of his family’s compact garden: “We call it the mini Viking Long House,” Mark said.
The roof has 150mm of soil (Photo: Mark Liebman)
So how do you build a green roof?
Even as a civil engineer, Mark is clear that you cannot simply add a green roof to an existing structure because its huge weight: a combination of the timbers, pond liner, soil, water when saturated, the weight of up to two people on the roof doing maintenance, and potentially even snow that could build up on the roof in winter in Blackheath.
He estimated that the 150mm depth of soil he put on the roof probably weighs between 1.3 and 1.4 tonnes per cubic metre. This could become completely saturated with 150mm depth of water as well.
Mark sought the advice of a structural engineer as he rebuilt his shed from scratch so that it would be strong enough to support the roof garden.
To increase the insulating capacity of his roof, Mark laid R4 Kingspan solid board insulation on top of (rather than under) the external marine ply layer of his ceiling. It is protected by multiple layers above.
10 steps
1. The shed’s timber framework was initially covered with 20mm marine plywood roof sheets.
2. Looking up at the marine plywood roof supported by very strong beams.
3. The plywood was covered by two sheets of builder’s plastic.
4. Kingspan solid board insulation was then added. There was a gap created between the eave and the edge of the Kingspan board, creating a trough for subsoil drainage. The builder’s plastic and insulation board were then covered by geofabric.
5. Waterproof pondliner was then pulled across the roof over the geofabric. The trough was filled with gravel for subsoil drainage. Water flows along the trough to the drainpipe at one end.
6. Atlantis drainage cells were added on top of the pondliner.
7. The roof was then partitioned into three segments and covered with another layer of geofabric. These segments acted as ribs to stop the soil washing down. Soil was then added.
8. The roof covered in top soil.
9. Drip irrigation lines were laid in place, then covered with open weave jute mesh to help hold the soil in place.
10. Immediately after the first planting.
More resources for green roof construction:
North Sydney Council Green Roof and Wall Resource Manual:
This story has been produced as part of a Bioregional Collaboration for Planetary Health and is supported by the Disaster Risk Reduction Fund (DRRF). The DRRF is jointly funded by the Australian and New South Wales governments.
In this inspiring interview with Medlow Bath resident Amanda Foxon-Hill she talks about her work with Mid Lachlan Landcare, why Growing Connected Landscapes for the Glossy Black Cockatoo is so important, and why she loves her work so much! Read the full story in Blackheath Area Local News here: https://blackheathnews.com/connecting-landscapes-for-glossy-black-cockatoos/
Book in for the Growing Connected Landscapes Forum at 4pm this Saturday 7 June here: https://events.humanitix.com/growing-connected-landscapes-for-the-glossy-black-cockatoo Register your interest for the Community Tree Planting Day in Goologong here: https://events.humanitix.com/glossy-black-cockatoo-community-tree-planting-5
In a world that increasingly feels out of balance, we’re thrilled to be offering Saturday morning Tai Chi and Qigong at 8am this Saturday 7 June (and the first Saturday of every month on our Skill Share Saturdays). Tai Chi is an ancient Chinese martial art and moving meditation for body, mind and spirit. It is ideal for learning to keep calm amidst chaos but also has health benefits to increase longevity. Harvard Medical School has reported that this gentle form of exercise can help maintain strength, flexibility, and balance, and could be the perfect activity for the rest of your life. It`s particularly popular in Hong Kong, where residents have one of the highest life expectancies in the world! T`ai-Chi has also been found to improve brain function (like memory and mental flexibility) faster than other exercise and, in a recent study, comparing T`aiChi to brisk walking, the martial art was found to be significantly better at reducing blood pressure and other risk factors for heart disease, like blood sugar levels and cholesterol. If you’d like to try it out, you can reserve your spot here (link in profile): https://bit.ly/3FxWPgR
Learn how to Grow Connected Landscapes for the magnificent Glossy Black Cockatoo at 4pm on Saturday 7th June. In our first Planetary Health Forum we’ll be hearing from Amanda Foxon-Hill from Mid Lachlan Landcare, Jayden Gunn from Birdlife Australia and Samantha (Pongi) Bowden from Glenbrook Public School, to learn more about the Glossy and how we can all help improve its habit from the Lower Mountains to Central NSW. We’re also launching a Community Tree Planting Day on 5 July in Goologong (near Cowra) to which we’re hoping we’ll get a large group of volunteers to help make a difference for this beautiful bird (and lots of other species as well!)
Habitat connectivity is essential if species are to adapt and overcome the challenges posed by our changing climate.
Join us as we imagine life as a Glossy Black Cockatoo. We`ll make our way through the temperate eucalypt forests of Dharug & Gundungurra land here in the Blue Mountains before leaving the Great Dividing Range for the Wheat & Sheep belt of the Central Tablelands. Our journey ends on Wiradjuri Land, North West of Cowra in the dry scleropyhyll forests of the Conimbla & Nangar National Parks, the start of the Western Woodland Way
Jayden Gunn is an adept wildlife photographer, ecologist, and environmental educator, with a deep passion for Australian birdlife. Through his lens, he captures Australia`s unique wildlife, using digital storytelling to connect people with nature in meaningful ways.
Links in profile to book in.
Book for the Forum here: https://bit.ly/43FzamP
Register your interest for the Community Tree Planting Day here: https://bit.ly/3HwYHa5
Watch an interview with Amanda here: https://www.youtube.com/watch?v=77y2jrCzINo&t=52s
Read more about Glenbrook Public Schools work for the Glossy Black here: https://lowermtnslocalnews.com/glossy-black-cockatoos/
Our newsletter is now out! View our video of Dr Keith Suter on "Making Peace in the World Today” and read about Growing Connected Landscapes for the Glossy Black Cockatoo and the 2024 Wynne Prize exhibition at the Cultural Centre. You can also book in for our Mushroom Cultivation and Tai Chi workshops, and our Planetary Health Bushcare on Skill Share Saturday, 7 June. And PS. We’re a finalist in the NSW Local Government Excellence Awards. Read the newsletter here (link in profile): https://bit.ly/4dEFL5u
Yesterday a delegation from the University of Sydney and the Razak School of Government in Malaysia visited the Planetary Health Centre to exchange experiences on the challenges all our local governments are facing, including adapting to climate change, managing ageing populations, and finding economic opportunities for small councils to support their community`s needs. @rsog_insta #localgovernment #planetaryhealth #disasterriskreduction #systemicchange #councils #malaysia #exchange...
As part of an international project to advance science communication for Planetary Health (SciCoPH), Indonesian science journalists, science communication experts and bioscientists visited the Blue Mountains Planetary Health Centre to learn more about what we`re doing last month. Read our story in Katoomba Area Local News here: https://bit.ly/43MFUjM (link in profile)
Has your place been smashed by all this rain? Check out our video of how Anne Mellor, on a sloping block in Springwood, built Japanese guttering and a dry creek bed to manage large influxes of stormwater in the most beautiful way. You can view the video in our Water Management Playlist on our YouTube channel (link in profile) Full instructions on how to do it in our story in Springwood Area Local News here: https://bit.ly/3YXIsJe (link to Springwood Area Local News in our profile. Search Individuals and you`ll find our story) #stormwater #flood #japaneseguttering #drycreekbed #beprepared #trenches #japanesegardendesign #planetaryhealth #springwood...
We need your help! Can you help us grow our YouTube channel subscribers and `watch hours` so we can get YouTube income to produce more great resources. Subscribe and watch our videos here (link in profile): https://www.youtube.com/@bluemountainsplanetaryhealth
Earlier this month, around 160 first year medical students from The University of Notre Dame Australia were introduced to Planetary Health and Dharug culture at the Planetary Health Centre, and learnt how to help people prepare for future heatwaves. Watch Professor Madden`s lecture and learn more about what they`re learning in our Planetary Health news here: https://planetaryhealthnews.com/future-doctors-learn-about-planetary-health/ (link to Planetary Health News in our profile) @notredameaustralia @doctorsfortheenvironment @ph_alliance @planetaryhealthcollective...
Recently we grew these stunning mushrooms with a kit from EarthRising Mushroom Farm in Lawson. If you`d like to learn how to grow your own, and get a kit to take home with you, we`ll be holding a Mushroom Cultivation workshop with Alex from EarthRising at our next Skill Share Saturday on 7 June. Bookings essential here: https://bit.ly/4dfc3nv (link in profile)
In a moving call for peace on Anzac Day, over 80 people gathered in the golden afternoon light at Peace Park in Katoomba to reflect on war and ask the hard questions about its grim reality. The day was interspersed with reflections, poetry, a minute of silence, and songs by The Bearded Ladies Choir. Read more, including about upcoming Peace events, in our new Planetary Health News here (link in profile):
Our newsletter is now out! Read about the launch of our new global Planetary Health News; about the Blue Mountains Peace Collective`s Anzac Day Reflection; about how future doctors are learning about Planetary Health; and about how science journalists from Indonesia visited the Planetary Health Centre to advance science communication for Planetary Health. You can also book in for our Mushroom Cultivation and T`ai-chi workshops. Read the newsletter here (link in profile): https://bit.ly/3YF3CvA
Lis Bastian is the Senior Lead for Blue Mountains City Council’s Planetary Health Initiative. She is the editor of the Local News Platforms and has been a writer, editor, news presenter and teacher/lecturer covering both cultural and environmental issues for over 30 years. She has been pioneering Solutions/Constructive Journalism in Australia since 2012.
The National Parks and Wildlife Service in the Blue Mountains built a rain garden with the help of NPWS Bushcare volunteers. The garden filters water from the roof of the new shelter in Blackheath and slows runoff, limiting erosion. It reduces nutrient levels, disadvantaging introduced weeds.
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