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.
As an increasing number of people are being affected by winter viruses, we’re offering a free session of Tai Chi and Qigong on Saturday 5 July in the warmth of our beautiful Frogs of the Blue Mountains exhibition. Places are limited so book in early here (link in profile): https://bit.ly/40fnGW2 Learn more about these Chinese medicine movement practices in the video interview with Virginia Field on our YouTube channel (link in profile) and read about how Chinese medicine helped her overcome illness as a young woman in our story: Healing Body, Mind and Spirit with Tai Chi and Qigong here (link in profile): https://www.katoombalocalnews.com/tai-chi-and-qigong/
If you’re interested in learning how to propagate native plants and are keen to help our bush regenerate, the Bushcare Seed Collectors meet on the second Tuesday of the month. Check out how they cook Banksias to release their seed and learn more about the group, and native seed collecting, in Katoomba Area Local News here (link in profile): https://www.katoombalocalnews.com/bushcare-seed-collectors/
If you’d like to join the group, contact the Bushcare officer Tracy Abbas on 4780 5623 or email tabbas@bmcc.nsw.gov.au
Littlejohni, the Rare and Endangered Northern Heath Frog, photographed in Woodford!
When the Frogs of the Blue Mountains exhibition opened at the Planetary Health Centre in March it featured photos of 20 different local frogs. We were thrilled, however, when Andy Klotz and other members of the Hawkesbury Herpetological Society recently managed to photograph another frog in Woodford: the rarely seen and endangered Litoria littlejohni, also known as the Northern Heath Frog or Orange-bellied Tree Frog. We’ve added a photo of that frog to the exhibition and created a new Frogs of the Blue Mountains video in which you can listen to its call on our YouTube channel. We interviewed Andy to learn more about the Littlejohni and how they managed to find its small local population. You can read this story in Mid Mountains Local News (link in profile). #biodiversity #bluemountainsfrogs #northernheathfrog #litorialittlejohni #bluemountains #woodford #planetaryhealth #hawkesburyherpetologicalsociety...
Our newsletter is now out! Read about how you can contribute to @bluemountainscitycouncil`s Biodiversity Conservation Strategy; watch our video on Falling in Love with Glossy Black Cockatoos; see the new photos of the rare Northern Heath Frog; watch how the Bushcare Seed Collectors cook banksias to release their seeds; learn more about Tai Chi and Qigong, the Chinese medicine movement practices; and take part in our next workshop on Designing Your Future Home with Passive House Designer Karina Rafailov from @earthy_haus
Read it here (link in profile): https://bit.ly/40e4GHr
Our video on Falling In Love With Glossy Black Cockatoos is now up on our Planetary Health YouTube channel (sorry, it`s too big to share here but there`s a link in our profile).
Jayden Gunn finishes his presentation by saying:
"Care is like a snowball. The more people you tell the bigger the snowball gets, and the further it goes. And the more we know, the more we care. And the more we know, the more we`re able to help."
The video is of our fabulous Forum on Growing Connected Landscapes for the Glossy Black Cockatoo, and includes presentations by Jayden Gunn, BirdLife Australia, Amanda Foxon-Hill from Mid Lachlan Landcare, and STEM teacher Samantha Bowden from Glenbrook Public School. There`s a link with the video on how to register for the Community Tree Planting Day in Goologong on 5 July (and it`s also in our profile). Video here: https://www.youtube.com/watch?v=pCERdF21Ud0&t=13s
Today we`re enjoying eating ripe medlars! Medlars are attractive cold climate fruit trees that were popular in Medieval gardens. They`re one of the few fruits that can be harvested in late Autumn and eaten in early Winter when they`re fully ripe. This is a great time of year to plant them for a future harvest. Check out our short video on how to eat them! #coldclimategardens #ediblegardens #medlars #growyourown #planetaryhealth #bluemountains...
We`re thrilled to share that last night @BlueMountainsCityCouncil`s Planetary Health Centre won the Innovative Leadership Award (Population Under 150K) in the 2025 NSW Local Government Excellence Awards. What a great end to World Environment Day! 🌏 This award celebrates how local government can lead transformative change for a more sustainable future. Thank you to everyone who worked so hard with us to make our vision a reality. You can read more about what we`re doing at our website (link in profile): http://www.bluemountainsplanetaryhealth.com.au/ @ph_alliance #planetaryhealth #worldenvironmentday #localgovernmentleadership #nswlocalgovernmentexcellenceawards...
Blocking out a couple of hours a week to step off the treadmill and give ourselves time to nurture our relationship with the earth and ourselves, is one way to keep our creative spirit and ‘lust for life’ alive. If you haven’t done so yet, one opportunity over the next week is to spend some ‘slow’ time in the 2024 Wynne Prize exhibition at the Blue Mountains Cultural Centre before it closes on 15 June. Read more in Katoomba Area Local News here (link in profile): https://www.katoombalocalnews.com/the-2024-wynne-prize/ @bluemountainsculturalcentre @artgalleryofnsw #wynneprize #landscapes #bluemountains #katoomba #artexhibition #planetaryhealth...
Recognising how violence and war impact the health of the planet, the Blue Mountains Planetary Health Initiative has become a member of the Blue Mountains Peace Collective. On Sunday 25th May, we attended a presentation by Dr Keith Suter on Making Peace in the World Today at the Leura Uniting Church. In this powerful presentation Dr Suter questions why we learn about war rather than successful peace negotiations! View the video of his presentation below and read our full story in Katoomba Area Local News here: https://bit.ly/3Fl4WgQ (link in profile)
With an extra day up your sleeve this long weekend, it`s a great opportunity to give nature a hand to regenerate and provide more habitat for our fellow species! Join our fabulous all ages Planetary Health Bushcare Group from 1.30pm and then participate in the Forum on Growing Connected Landscapes for the Glossy Black Cockatoo at 4pm, followed by drinks and nibblies! You can also start the day with a fabulous Tai Chi session at 8am. Visit our Planetary Health Pluriversity website to book in and learn more (link in profile): https://bmpluriversity.org/program/
Or ring 0407 437 553 for more information. #planetaryhealth #bushcare #katoomba #bluemountains #glossyblackcockatoos #landcare #biodiversity #habitat #wearenature #togetherwecan...
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
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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