Wednesday, November 10, 2021
First Dutch Detention Roof for soft drink supplier Vrumona.
The very first Detention Roof in the Netherlands was recently installed on the Vrumona business premises in the municipality of Bunnik. On November 8, 2021, the 588 m2 green roof was officially opened by local alderman Jocko Rensen. Thanks to this innovative green roof concept, the risk of flooding due to extreme precipitation on the site will be drastically reduced. The Detention Roof can store rainwater in a fully saturated state and discharge it in a delayed and controlled manner.
Making the Utrecht region more climate-proof
In recent years several green initiatives have emerged in the province of Utrecht. Detention Roof supplier Sempergreen recently signed a Declaration of Intent for Climate Adaptive Building with the Province of Utrecht with the aim of making the Utrecht region more climate-proof. Both Vrumona and Sempergreen are also participants of Green Business Club Bunnik. Thanks to this green initiative, the companies came into contact and were able to realise this ambitious green roof project together.
Sjors Wessels of Sempergreen, participant of Green Business Club Bunnik: “We are very pleased with the extensive collaboration that has been established to realise this innovative project. It shows that local initiatives in the field of sustainability can be an important basis for projects that make the region more climate resilient. With this initiative, Vrumona is taking an important first step in the field of preventing water problems at and around the business park.”
Jocko Rensen (Alderman Bunnik), Evelien Sanders - de Boer (General Manager Vrumona), Stephan Beerends (Director Sempergreen)
Photo: Ritchie Damwijk
Preliminary exploration with the help of Water Board
At the start of the project, the parties involved mapped out issues that could cause flooding in the area together with Water Board ‘De Stichtse Rijnlanden’. This preliminary exploration showed that the business park where Vrumona is located at, is predominantly paved and would benefit hugely from a Detention Roof. With the implementation of this Detention Roof, a large part of the water problem in the area will be solved, because water is discharged in a delayed and controlled manner. In the event of extreme precipitation the Detention Roof will relieve the sewer system. Moreover, the green roof system complies with governmental water policies, rainwater regulation and/or other, increasing requirements of municipalities and water boards.
Evelien Sanders-De Boer, General Manager of Vrumona: “This green roof is a wonderful example of local collaboration and fits in perfectly with the circular and sustainable mission that we have at Vrumona. Water is a crucial part of our product and a good and efficient water supply on our site is very important.”
Installation within two days
For the installation of the Detention Roof, Sempergreen collaborated with several parties. The application of a new layer of bitumen was done by Van Doorn Dakspecialist. Next, De Dakdokters installed the Detention Roof. The green roof measuring 588m2 - divided over two roof surfaces - was completed within two days.
The installation of the Detention layer and the Honey Comb (HC) layer
Peach stone edging
This Detention Roof uses a durable edge finish from Nocciolo, consisting of peach stones (also known as peach kernels) derived from residual flow. Peach stones do not rot, are resistant to algae growth and do not absorb moisture, so they do not mold. They have a lifespan of more than 30 years, making them an extremely sustainable solution for this project.
Peach stone edge finishing
Sustainability main priority for Vrumona
Vrumona is een van de grootste frisdrankenleveranciers van Nederland en heeft duurzaamheid tot speerpunt verklaard. Met haar duurzaamheidsbeleid wil het bedrijf haar impact op het milieu zo klein mogelijk houden. Zo kiest Vrumona al langere tijd voor 100 procent groene elektriciteit. Bij het bereiden en verpakken van frisdrank is er alle aandacht voor efficiënt en circulair gebruik van grondstoffen, verpakkingen, water en energie. Afval en emissies worden waar nodig voorkomen en waar mogelijk verminderd.
Ook het gebruik van plastic heeft hun aandacht. In 2018 realiseerde Vrumona bijvoorbeeld een besparing van 9 procent, wat gelijk staat aan ruim 200.000 kilo van deze grondstof. Door aanpassingen in het ontwerp van de doppen werd in een jaar tijd 70.000 kilo minder plastic gebruikt. Ook maakte Vrumona de flessen 2 procent dunner. Dit leverde een besparing op van 130.000 kilo. Het werken aan gezondheid en veiligheid is voor iedereen binnen het bedrijf inmiddels een tweede natuur. De installatie van het Detentiedak past hiermee uitstekend binnen de duurzaamheidsdoelstellingen van Vrumona.
Detentiedak ook geschikt voor bestaande bouw
Het gebouw van Vrumona bestond al. Dat is nog reden waarom het Detentiedak een perfecte oplossing was voor het bedrijf. Het Detentiedak is namelijk toepasbaar op daken die relatief weinig gewicht kunnen dragen en/of een dakhelling tot 2⁰ hebben. Dit zijn over het algemeen daken van bestaande gebouwen. Het vergroenen van bestaande bouw is duurzamer en vaak goedkoper dan het neerzetten van een nieuw, groen pand.
Installation of the Knauf Urbanscape green roll - the substrate layer
The construction of a Detention Roof
On this website you can read everything about the water-storing capacities of the Detention Roof. The system structure of the Detention Roof is what makes this type of green roof unique. Read more about the four unique layers of a Detention Roof here.
