Gå til hovedindhold


Denne idé er en del af The Circular Construction Challenge – Rethink Waste

Niels Jakubiak Andersen
Niels Jakubiak Andersen
2. oktober 2018

Short Resume:

ReSkur is a high quality shed building system for household and office buildings unheated storage space (waste fractions, bicycles, etc.) build and rebuild from recycled roof materials.

PROBLEM / SUPPLY : "Quality materials with no immediate market"

Renovation of buildings is a huge marked in Denmark with yearly turnovers of 100 billion DKK. We estimate that roof top renovations yearly sum up to 25 billion DKK, equal to aprox. 5 mio m2 roof per year.

The background of these renovation projects are either leaks or corrosion of inner plastic layer (unfortunately very often used in renovations in the 70´ies and 80´ies), energy optimizations, or new future use of roof area such as roof terraces, roof top housing etc.

These roofs consists of several high quality materials with significantly longer life span such as clay-pantiles (2-300 years), natural slates (2-300 years), Pine tree wood rafters (3-400 years), wood boards and battens (250 years) and steel gutters (100 years) and even bricks (800 years).

These materials are today disposed of in accordance with the existing legislation and often downcycled to be used as chips for heating (wood) or crushed into road filling (tiles).

Waste in the form of bricks and tiles constitutes an estimated 4% of the total building and construction waste, corresponding to approximately 200,000 tons a year. Wood accounts for an estimated 1-2% of total waste volumes in the building and construction sector. Most of the wood waste is turned into wood chips and is incinerated to generate energy. One of the reasons for this is the lack of classification and certification of used wood which can guarantee durability and strength.

Recycling of building waste requires more gentle demolition to ensure that the materials are preserved, and there are today methods available for achieving this. But the problem is that there is no established marked or demand for these materials that could create the incentives needed to recycle these high quality materials.

POTENTIAL / DEMAND : "Everybody needs a shed"

As a result of urbanization and general densification the demand for cost and energy-effective buildings have increased. Thus we see that new build houses are without basements and maximized to the allowed Floor Area Ratios. Also old multi story apartment buildings are functionally optimized with development of basements to business leases and roof top areas to more apartments/terrasses.

As an effect of these trends the increasing demand for storage is clear. Some storage spaces needs to be in a climate controlled environments (such as what is offered in central places by Pelican Self Storage) but a huge part needs to be locally positioned outside the living units /offices, and shouldn´t be heated minding the desired energy efficiency of our buildings.

Storage of our household waste fractions, bicycles etc. are easily stored in climate covered but non-heated sheds that because of their status as secondary buildings have very few regulations and can be easily allowed.

Unfortunately what we today see in the shed market are predominately ugly, un-environmental, short lifecycle (20 years) sheds of galvanized steel, plastic roofs or pressure impregnated wood.

-Not great for the environment and not very aesthetically fitted with the surrounding. Uintentionally these sheds are degrading the experience of the quality of place.

Compared to the present sheds on the marked we estimate that a total transition of all sheds to recycled materials would save the environment 40.000 Tons / year for the calculated 30 year period (present sheds lifetime) it would take to replace all.

(37, kg CO2/m2 saved compared to galvanized steel (aluminum is double and wood is half))

Vision: ReSkur - Recycled roof materials rebuild to high quality sheds

We see a great market potential and potential costumer demand for high quality non heated sheds for housing- and office buildings storage space (garbage, bicycles, garden accessories) build from long life cycle high quality recycled wood, roof tiles from roof top renovations.

We want to push the transition towards circularity by offering a higher quality product with longer life span and aesthetically much more pleasing expression. With this product/service we want to create the necessary demand for a direct reuse of high quality and long life materials that for other reasons needs to be replaced on the roof.

Through vintage story telling we want to show the users that/and with signage where the materiales have been before and what other purpose they have served. With this experienced circularity we want to connect people to the past while heading towards the future sustainable society.

Market potential / Scaleability: Yearly 2 billion DKK Market

Solely focusing on the housing marked we have 2,7 mio. households in DK. If every households has an average demand for 10 m2 unheated shed we have 27 mio. m2 sheds in Denmark. Setting the lifecycle of an average shed to 30 years means that 900.000 m2 sheds would have to be exchanged every year.

The available sheds on the marked costs between 800-2000 kr/m2 delivered as a DIY project meaning that with and avr. of 1500 DKK / m2 would sum up to a total marked yearly turn over apr. 1.350.000.000 DKK. This excluding the turnover from the building process, and other services that could be included.

If we include others parts of the accessible marked such as institutions and office buildings we estimate the total marked to be yearly at least 2 billion DKK.

Value Creation


+ Beautifull, functional and long lasting sheds

+ Story telling, connecting to the heritage 

+ Extension of life cycle of other products such as bicicles.

+ Mass costumized product, fittet to the unique envirronment

+ Sustainable product

+ Leasing or other financing options possible as a driver


+ Synergies with other building activities

+ Savings from Waste to Value

+ Unique position at the sourcing of materials, hard to copy business model

+ BRAND-value of company, culture of craft


+ CO2 savings of aprx. 37,5 kg/m2 up to 40.000 T CO2 / år

+ Pushing the transition towards a circular economy and a sustainable society

+ A small but exemplatory strong step towards meeting The UN Sustainable Development Goals 8, 9, 11, 12 and 13

Co-Creation "The succes depends on it"

The ReSkur design won the Upcycle Challenge in June 2018 initiated by construction firm Enemærke & Petersen and BLOXHUB.

Enemærke and Petersen is a big construction company specialized in renovation and thereby also used to dispose these materials every day. Enemærke & Petersen wants to find new ways to upcycle these high quality materials they otherwise have to downcycle og dispose as part of their construction processes. So in their “Upcycle Challenge” call before summer they partnered up with BLOXHUB and announced Krydsrums “ReSkur” as the winner and Vandkunstens “Pantile af façade system” as 3rd. runner up.

Subsequently Krydsrum, Vandkunsten and Enemærke & Petersen with help from Smith Innovation and BLOXHUB through a 2 days “Match and Create” workshop have looked further into potentials and barriers with different strategies, business plans, value chains, costumers etc. This work has clearly showed that the success of this idea will depend on further development of the following:

Business  plan and organisation: Pricing strategy, incentives, the right team

Proces: Value chain set up from roof renovation to new quality shed, team deliverables, incentives to optimize.

Product: Design and services, prototyping, effectiveness, industrialization, extra services/deliverables, product guarantee

Sales: Storytelling, costumer segments, sales channels, competition

Focusing only on further product development would in this case be a mistake since a key to a successfull entrance to the market will be innovation in the other 3 dimensions as well.

Help Setting the right team: "Who has the keys?"

The success of this concept also very much depends on finding and refining the right organization. We have a core team but the individual roles are not defined and it is not clear how many other competencies are needed. Here is to mention some:

Demolition companies

Social entrepreneurs

Small construction companies

Business Development Consultants

Finansing institutes

The Circular Construction Challenge is a great chance for the “ReSkur” concept to take the next important steps and through the process of  optimizing the business plan, supply chain, organization and sales strategy as well as prototyping and testing the product in both construction processes and in use.

The success of this concept depends on the right partners/organization so we hope that the Circular Construction Challenge could become to platform from with this can be built.