Ridderkerk will have a sound screen of more than 1,450 meters in length from Dutch fiber hemp
The municipality of Ridderkerk has a very special noise barrier, one that is filled with (lime) hemp! On Monday, June 29, 2020, the ownership certificate of the more than 1,450-meter-long screen was officially handed over by Greenwall BV to the municipality of Ridderkerk, represented by councilors Peter Meij (CDA) and Marten Japenga (ChristenUnie). Also present was the co-founder of the NL Greenlabel foundation, Lodewijk Hoekstra (known from the TV program Eigen Huis & Tuin).
Opt for green
The noise barrier on the ground wall next to the Rotterdamse weg, near the Het Zand and Drievliet districts, was clearly in need of replacement. It turned out to be a challenge: the ground was subsiding, while the municipality also wanted to take into account issues such as price, lifespan, acoustics and aesthetics. In addition, a precondition was that the existing greenery was preserved as much as possible. Mariëlle Heijboer (BAR organization, municipality of Ridderkerk) put her shoulders under it, and also focused on “green”. Ultimately, the ideal solution was found in a lime hemp noise barrier from Greenwall BV.
Hoekstra (NL Greenlabel foundation) will take on the role of moderator at this festive presentation. In conversation with the two councilors, the TV gardener candidly tells about the foundation of his foundation: “I found out that as a gardener I was destroying everything. I made the gardens beautiful, but often plastic products and pesticides were used. I started to think differently about the production phase and the impact I could make. This resulted in the foundation of the NL Greenlabel foundation. 10 years later, we completed 10 green deals and built up an extensive network of over 200 partners. Greenwall was also one of our first partners. ”
Ridderkerk plays a pioneering role
Aldermen Meij (public spaces) and Japenga (sustainability / circular economy) also attach great importance to sustainability. Japenga: “It is important to ensure that everything is maintained properly. Green and outdoor space also has to do with air and sound. We are busy with that in Ridderkerk. ” Meij further adds: “We have a long-term vision, which starts with a green vision.” When the ownership is signed, the municipality receives a compliment from Erik Muggen (Greenwall): “I am happy to see that you play such a pioneering role. You are an example to other municipalities. ”
90% sound absorption
Aldermen and officials were not aware that the noise barriers were filled with lime hemp. And that is good: hemp was specifically chosen because of the enormously good sound insulating properties. Muggen explains: “With lime hemp, the sound absorption in particular is very high, namely 90%. For comparison: glass and concrete have an absorption value of 0%. The good absorption of lime hemp has to do with the fact that it is vapor-open, and therefore very porous. And the more porous the material, the better the absorption value. Unlike glass or stone, lime hemp does not have any reverberation. ”
A label for Sustainability
Greenwall noise barriers consist of 4 components, including a substrate (the interior of the screen). For some time, Greenwall had been looking for an alternative to this substrate, on the condition that it had to be at least as sustainable. Not far from home they found what they were looking for: hemp wood from fiber hemp grower and processor DunAgro. Together, the companies developed the Greenwall® hemp mix, a mixture of hemp wood and lime. The final noise barrier received an A-label in the field of Sustainability from the NL Greenlabel foundation.
A good example of regional cooperation
The DunAgro hemp wood used for the Greenwall hemp mix is from Dutch soil, and the panels from which the noise barriers are built are produced in the Netherlands. In addition to the material, the cooperation between the two parties also appears to be sustainable, says Jacob Jan Oostra (Greenwall BV): “The intention is that 90% of all Greenwall screens will be filled with hemp. There are already a few new applications in Emmen, Moergestel and even a second project in Ridderkerk. ”
Also for consumers?
Although Greenwall does not specifically target consumers, it is certainly possible to have a partition wall made for your own home / garden. But it is also interesting for school squares, for example. It is mainly about the durability and the aesthetic character. That the screens also prevent good noise is a big plus. And for those who are wondering: the hemp mix in the sound screen is very resistant to rain. After getting wet for the first time, the material cures on drying so that it remains water-resistant for years. And at the end of its life, the material can be put on the compost heap!
Details Greenwall hemp noise barrier
Length: 1468 meters
Height: alternating from 0.5 to 2 meters high
Thickness: 982 meters are panels of 16 cm, the other 470 meters are trapezoidal and on average 30 cm thick
Materials used: steel cage, inlaid with coconut cloth, and a core of hemp wood (“Greenwall® hemp mix”; 50% hemp wood, 50% lime)
Screening planting: large-leaved and evergreen ivy (Hedera Hibernica), 2 species of honeysuckle (Lonicera Henryi and Lonicera Japonica) and Virginia creeper (Parthenocissus Quinquefolia).
Lifespan: 30-40 years
Advantages: high sound absorption (90%), sustainable and locally produced product, little to no maintenance required, does not invite graffiti / vandalism
About Greenwall BV
Greenwall BV is specialized in the production of soundproofed boundaries. The unique thing about their concept is that only organic (biodegradable) or recyclable materials are used, without environmentally harmful elements, plastics, plastics or contaminants.
More information: www.greenwall.nl
About Dun Agro
The Dun Agro Hemp Group has been active in the hemp industry for more than 25 years, in both the food and fiber sectors, and from agriculture to end product. Dun Agro has developed proprietary technologies for most purposes and is at the forefront of the innovation and value chain of the hemp industry.
More information: www.dunagrohempgroup.nl