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De Boer Green english

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brochure De Boer Green english
  • Green roofs by De Boer Green are the fruit of know-how and craftsmanship.

    We are rooted in De Boer, a company which has been making superior waterproofing membranes for roofs since 1922. We care about the environment, about energy awareness and about sustainability.

    Xeroflor is our premium partner for green roof vegetation. They have been developing their system of lightweight, pre-vegetated mats since 1972.

    The famous architect Le Corbusier once remarked: Isnt it against all logic, if a whole urban surface remains unused, missing the dialogue with the stars? With this in mind, we aim to make your roof green.

  • GREEN ROOFS: WHAT AND WHY?Green roofs are pretty, environmentally-friendly and economical. They create a nicer environment to live in. Sunbathing in the city, catching a breath of fresh air during work, or just generally enjoying nature even when in the center of a busy city: green roofs make it possible. Roofs protect us from the elements. While a plain roof may meet this requirement perfectly, more is possible, e.g. by going for a green roof.

    A green roof is mostly covered with living plants. The name green roof may be a bit misleading, though, as the roof as such doesnt have to be green, nor do the plants which are cultivated on it.

    Vegetation cannot simply be planted on the roof. Green roofs require a proper base with an appropriate structure, a suitable growing medium and proper drainage.

    In principle, you could let nature follow its course. Only, it is likely to take ten to twenty years before you get the desired effect. Its better to give nature a hand by opting for a proper green roof with pre-vegetated mats.

  • ECONOMIC BENEFITS Green roofs improve water management (retention capacity, less risk of

    flooding,...); cool (especially during Summer, your building will remain cooler;

    you will, therefore, save on air-conditioning costs); are sound insulating; extend the lifespan of the waterproofing membrane (thanks to

    the vegetation, the membrane is less exposed to UV rays, to the weather, etc.);

    save space and use otherwise unused space; promote recycling (good to know: most components of our green

    roof systems result from recycling).

    ENVIRONMENTAL BENEFITS Green roofs improve the air quality; the air is much purer on a green roof. Thats normal, considering

    that the vegetation produces extra oxygen and filters the fine dust particles;

    reduce the warming in built-up areas; have you ever heard of the urban heat island effect? Even if you

    havent, you will certainly have felt it: in cities, temperatures are higher and the air is dryer. Thats where the vegetation on green roofs comes in: it lowers the temperature and the evapotranspira-tion makes the air less dry. Indirectly, lower temperatures reduce the consumption of energy, the use of fossil fuels and the emission of CO2. In short: a better air-quality;

    increase biodiversity in cities; the more green roofs there are, the more vegetation there is and

    the more animal diversity there is. Green roofs bring nature back into the cities.

    AESTHETIC BENEFITSGreen roofs make for a pretty investment; add an extra floor to your building; are eye-catchers which is also commercially appealing; its clear that plants appeal more to peoples imagination than a

    plain grey or black roof would ever do.

    There are two big categories of green roofs. The German FLL (Forschungsgesellschaft Landschaftsentwicklung Landschaftsbau e.V. or Landscape and Landscaping Development Research Society) distin-guishes green roofs based on the required level of maintenance:

    intensive greening: creates a roof garden which is comparable to a garden at ground level, both in use and in the required mainte-nance;

    extensive greening: the green roof is low-maintenance but access is limited or even ruled out

    In between these two categories, there is also semi-intensive greening. One cannot say that all green roofs are roof gardens. The opposite does hold true: all roof gardens are green roofs. A roof garden is a green roof which has the characteristics of a garden, but which is situated on a roof. Why opt for a green roof?

    a green roof is so much prettier than a conventional roof; environmentally-friendly: green roofs reduce the pressure on the

    sewage system, they reduce the risk of flooding, they have a cool-ing effect, etc.;

    economical: investing in a green roof will help you save money. Not only will the waterproofing system on your roof last twice as long, you will also benefit from government grants.

  • OUR SYSTEMSWhen considering which type of green roof to install, you first of all need to consider the physical and technical characteristics of your building. The maximum installation height and the maximum load of the roof structure will determine the thickness of the substrate and, thereby, the choice of vegetation.The latter also depends on the roofs orientation and on the level of maintenance you are looking for.


    Our DBGS DRAIN 8 is a three-dimensional mono-filament structure which consists of two filter fleeces with a mat of polymeric entangle-ments with large cavities in between. The layers are thermally bonded to one another.

    Because of its specific construction, DBGS DRAIN 8 fulfils three roles: it drains any excess water; it protects the underlying waterproofing membrane from mechan-

    ical damage; it filters the small substrate particles, avoiding any clogging of the


    Water-retaining layer

    In order to achieve sufficient water retention, we sometimes put water-retaining geotextile or mineral wool on top of the drain mat. Whether this is needed or not, depends on the chosen vegetation, on the maximum installation height and on the roof load.

    Growing medium This is the layer in which the vegetation roots. As such, it is the vital component of the green roof system. It consists of either a mineral substrate or a water-retaining layer.

    As the plants nurturing ground, the substrate most not only have the right physical, chemical and biological composition, it must also have proper ventilation and water management.We determine the thickness of this layer based on the intended vegeta-tion. The larger the plants, the thicker the substrate layer will need to be

    Vegetation layer

    In the case of intensive greening, there are hardly any limits: flower beds, a lawn, shrubs and even trees. Extensive greening is limited to sedum, moss and sometimes herbs.

    Attention: plants which root aggressively or plants with tap-roots are not suited for green roofs.

  • INTENSIVE GREEN ROOFS Wouldnt it be wonderful to turn your roof into a real living area ?

    This is perfectly feasible. Indeed, unlike extensive green roofs, intensive green roofs are meant to be walked upon. In fact, you can use them for various recreative purposes.

    An intensive green roof requires maintenance similar to the mainte-nance of a traditional garden. Of course, the buildings design needs to cater for the thick substrate layer.

    But, then, the land used for your garden comes for free. A big saving, bearing in mind the high and ever increasing price of land.

    De Boer Green has developed two standard systems for intensive vege-tation. We can easily adjust them to your projects specific requirements.

    DBGS-I-HIGHRoof pitch System configuration Maximum roof load Construction height

    1-6 DBGS drain 8 450 kg/m2 - ... 31cm - ...

    possibly an additional water retention layer (may be indicated when extra water buffering capacity is required)

    Xeroflor XF 203 (min. 30 cm) in accordance with RAL

    an almost unlimited choice of plants:a range of ground cover plants, ornamen-tal grasses, perennials, higher types of shrubs, small trees or a traditional lawn.

    DBGS-I-MEDIUMRoof pitch System configuration Maximum roof load Construction height

    1-6 DBGS drain 8 300 - 450 kg/m2 20-30cm

    possibly an additional water retention layer (may be indicated when extra water buffering capacity is required)

    Xeroflor XF 203 (min. 20 cm) in accordance with RAL

    a range of ground cover plants, ornamental grasses, perennials, most lower shrubs or a traditional lawn.

    CONSTRUCTION1st layer : drain mat2nd layer : mineral substrate3rd layer : vegetation

  • EXTENSIVE GREEN ROOFSThese low-maintenance vegetation systems are suited for (low pitch) roofs (1-35) with a normal exposure to the sun, rain and wind and which are seldom walked upon.

    Advantages: requires little maintenance; limited choice of vegetation; not meant to be walked upon, except for maintenance; the least demanding from a building-technical perspective.

    Functional characteristics

    aesthetic: permanent vegetation, which changes with the seasons and with the sunlight;

    florescence from May to August, depending on the species; slow-growing plants, requiring little maintenance, pruning or

    mowing; plants which resist well to drought: watering is not needed, unless

    just after planting or in the event of exceptional drought (longer than 6 weeks);

    acts as a rain water buffer (depending on the system up to 34 liters per m and 50 % of annual rainfall); in the case of heavy rain, less water goes into the sewage system, and the water that does, does so much slower;

    protects the waterproofing membrane against UV rays, thus significantly increasing the membranes lifespan;

    protects the building from the sun during Summer: this natural cooling reduces the energy consumption of the air-conditioning system;

    retains the dust particles in the air; insulates against air nose and contact noise (rain or hail); enhance

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