FAQ

Do you have a question about nidagravel®? Maybe you will find the answer below.
Of course you can always contact us anytime.

Questions
  1. Where can I buy nidagravel®?
  2. Is dolomite suitable for nidagravel® gravel stabilisation?
  3. How does nidagravel® gravel stabilisation reduce weed growth?
  4. How susceptible is nidagravel® to wear and tear and aging?
  5. What is the situation with regard to a ternary mixture?
  6. How environmentally friendly is nidagravel® gravel stabilisation?
  7. How should the gravel surface created using nidagravel® be maintained?
  8. How much gravel do I need per m²?
  9. Tips for choosing gravel
  10. What is the function of the geomembrane?
  11. What is the effect of salt used in the event of snow?
  12. What size gravel should be used?
Answers
  1. Where can I buy nidagravel®?

    nidagravel® is manufactured in France. In order to ensure efficient transportation, we work together with distributors who buy the product in large quantities.

    For further information and prices, do not hesitate to contact David Shakespeare by e-mail or by phone: +44 (0)1832 77 65 68 or contact us via the contactform.

    Up

  2. Is dolomite suitable for nidagravel® gravel stabilisation?

    Gravel type is indicated by name (e.g. dolomite) and a number that relates to the minimum and maximum size of the gravel (e.g. 5/15). In the case of some types of gravel the fraction of the minimum size is extremely small (e.g. dolomite 0/5). If the minimum size is 0 then this is called dust. The huge advantage of this type of gravel is that the surfacing material settles by itself so that all dips in the gravel are filled up by the dust.

    This is not, however, without consequences:

    • Permeability is greatly reduced

    • The dust will blow around during dry periods.

    • In wet weather conditions the small fractions will stick easily to shoes.

    • Dust from the surrounding area will stick to the surface but will not be drained into the 
      base because the surface is virtually impermeable. As a result, the colour of surfacing 
      changes after a few years from yellow to a brownish beige.

    • This surfacing also tends to develop dips and ruts, so that regular maintenance is required.

    Another disadvantage of dolomite is that this rock is fairly soft. Average or intense use of this surfacing (e.g. cars) will cause the gravel to become even finer, which leads to substantially reduced permeability (puddles, holes, …).

    With nidagravel® you no longer have to use gravels with dust (= diameter 0 mm) which settle by themselves

    Up

  3. How does nidagravel® gravel stabilisation reduce weed growth?

    The seeds of weeds will germinate if they land on the gravel surface during wet periods, certainly if calcareous rock has been used.

    However, the geomembrane with which the sheets are backed will hamper root growth. In consequence, the roots of any weeds will be mainly concentrated in the nidagravel® honeycombs. As the nidagravel® surface is 100% permeable, during a dry period most weeds will soon suffer from a lack of water and eventually will dry out and die. The remaining weeds can easily be removed, as the roots are unable to anchor in gravel.

    In addition, a crushed stone foundation does not provide a good source of nutrients for weeds and any weed seeds already present in the ground or foundation are prevented from growing due to the presence of the geomembrane.

    Up

  4. How susceptible is nidagravel® to wear and tear and aging?

    Traffic

    If vehicles and wheeled items are separated from the nidagravel® sheet by a top layer of gravel then the wear and tear to the nidagravel® sheets will be minimal. Which is why regular inspection is absolutely necessary to ensure the long life of the hard surfacing.

    The influence of weather

      • nidagravel® is UV-resistant.
      • nidagravel® is not susceptible to frost.

    Earth – humus

    If, after a number of years, the hollow spaces in the gravel are filled with humus or earth then it may be necessary to replace the gravel. The huge advantage of using nidagravel® is that only the top layer needs to be removed and renewed. As a result, you have a totally new hard surface at extremely low cost.

    Up

  5. What is the situation with regard to a ternary mixture?

    Where possible a foundation layer that is more permeable than the base should be used, which is why we recommend a crushed rock foundation. But in some situations it is better to use a ternary mixture. nidagravel® is ideal for laying on such a mixture:

    • Chemically: no problems
    • Mechanically: excellent as ternary mixtures can be made perfectly level.

    Up

  6. How environmentally friendly is nidagravel® gravel stabilisation?

    nidagravel® is made from 100 % recyclable polypropylene.

    Its production:

    • More than half of the material comes from recycled polypropylene.
    • Polypropylene is a chemically inert product, therefore there is no pollution.
    • The light structure means that the amount of energy used for production and 
      transportation is limited.

    After laying :

    • 100 % pemeable
    • Helps prevent flooding
    • Groundwater remains at the desired level
    • The geomembrane backing prevents seeds from germinating in the base (= less
       herbicides)

    Up

  7. How should the gravel surface created using nidagravel® be maintained?

    After the surfacing has been laid it is recommended that the top layer (i.e. the 1 – 2 cm layer that protrudes above the nidagravel® sheets) be regularly inspected. The purpose of the top layer is to prevent direct contact between vehicles and wheeled items and the nidagravel®sheets and also to hide them.

    Immediately after laying, the gravel will subside due to natural compaction so that the sheets may be exposed. In this case extra gravel should be added both for aesthetic reasons and from a functional point of view. In the case of regular use it is recommended that the top layer be levelled. This can be done quickly using a rake or similar tool.

    Up

  8. How much gravel do I need per m²?

    Gravel generally has a volumetric mass of 1600 kg/m³. You always need a 5 cm layer of gravel. This gives us 1600 x 0.05 = 80 kg/m² .

    Always ask your gravel dealer about the volumetric mass in order to estimate the quantity of gravel for your application as accurately as possible.

    Up

  9. Tips for choosing gravel

    Gravel type is indicated by a name and a number that relates to the minimum and maximum size of the gravel (e.g. dolomite 5/15). In the case of some types of gravel the fraction of the minimum size is extremely small (e.g. dolomite 0/5). If the minimum size is 0 then this is called dust. The huge advantage of this type of gravel is that the surfacing material settles by itself so that all dips in the gravel are filled up by the dust.

    There are, however, substantial disadvantages associated with this.

    • Permeability is greatly reduced
    • The dust will blow around during dry periods.
    • In wet weather conditions gravel with a small fraction will stick easily to shoes.

    The following guidelines should therefore be followed

    • Avoid using types of gravel with dust fractions
    • Use a minimum/maximum grain diameter of 4 / 16
    • Use gravel from hard rock as this cannot be pulverized in the long term!
    • Choose round granulates for areas used by children (less painful when coming into contact with bare knees e.g. pea gravel 5-8)

    Your gravel dealer will be able to provide you with the necessary advice.

    Up

  10. What is the function of the geomembrane?

    The nidagravel® sheet is backed with a thermally attached geomembrane. This has a double function:

    • Firstly, it ensures that the gravel does not end up under the tray, preventing the sheet
      from being pushed up in the long term.
    • Secondly, the geomembrane is also an anti-weed membrane.

    Please note: weeds do not always come from the ground. Weeds grow because the seeds fall onto the surfacing (birds, wind, …). These seeds will germinate in damp ground combined with calciferous rock. However, gravel does not provide a good source of nutrients. The roots will be concentrated in one honeycomb cell because the root membrane hampers root penetration. The weeds will die off by themselves during the next dry period, as they will soon suffer from a lack of water because gravel, in combination with the honeycomb structure, is free draining.

    The geomembrane protrudes along one of the two sides of the nidagravel® sheet. This geomembrane is overlapped with the next tray. In this way you prevent gravel ending up between two sheets at a joint.

    Up

  11. What is the effect of salt used in the event of snow?

    Unlike with grass tiles, salt used to melt snow and ice does not have a negative effect on gravel surfacing created using nidagravel®. When using a snow scraper care should be taken to ensure that the top layer of gravel is not scraped off too. It is best to clear the snow to a depth of 3 cm above the nidagravel® layer, after which salt can be used.

    Up

  12. What size gravel should be used?

    With regard to minimum fraction, we advise against using gravel that is smaller than 4 mm (sticks to shoes and car tyres).

    With regard to maximum fraction, we advise against using gravel that is larger than 16 mm (the gravel type used must be able to compact easily in the honeycombs).

    Up