Sub-base for grass grid

The substructure for a grass grid is one of the key elements that determine the durability and functionality of this type of paving. A well-designed one ensures the grid’s stability, longevity and proper drainage of groundwater. Understanding the importance of the substructure and its adaptation to the type of soil is essential for optimal results.

Stella Green grass grid filled with aggregate. Photo source: own materials.

What exactly is a substructure?

The substructure is the layer that is responsible for the even transfer of loads from the pavement to the native soil. Its task is to provide a stable base for the even laying of the trellis. Made of materials such as crushed aggregate or ballast, it acts as a solid foundation for the grass grid. It is best to entrust the assessment of the appropriate type of substructure for the site to a specialist. The choice depends primarily on the characteristics of the soil and the intended use of the pavement. A key step in this process is to conduct an analysis of the native soil that will be reinforced.

Lawn grating without a substructure – is it possible?

Many people wonder whether grass grids can be installed without a substructure. In theory, such an installation is possible in areas with very low loads (for example, on recreational plots, in greenhouses or on paths in the garden). However, in practice, the lack of a substructure most often leads to instability of the grid, especially in less permeable soils. The pavement can collapse, and growing grass will be vulnerable to damage.

Experts from the Murator Dom website emphasize that “laying a grass grid requires a substructure, the type of which depends on whether we will only walk on the surface or whether cars will drive there.” In turn, specialists from Budujemy Dom recommend creating a solid substructure of ballast (0-31.5 mm fraction) as the first load-bearing layer for grass grid.
Sources: https://muratordom.pl/ogrod/nawierzchnie/kratka-trawnikowa-czy-warto-ja-zastosowac-przy-domu-rodzaje-kratek-trawnikowych-i-sposob-montazu-aa-Trat-nRWk-JYfr.html?utm
https://budujemydom.pl/wokol-domu/ogrod/a/15838-wykonanie-podjazdu-z-kratki-plastikowej

The materials you will use to lay the foundation

The materials that will work best are:

Crushed aggregate – this is one of the most commonly used materials, which is characterized by high durability and load-bearing capacity. Different fractions are used, depending on the construction requirements and type of soil.
Ballast – excellent for stabilization and providing drainage. Mainly used in base layers, especially in areas with heavier loads, such as parking lots.
Sand – used as a leveling layer, it ensures precise leveling of the pavement. Its fine granularity allows the grass grid to be accurately laid.
Cement-stabilized aggregate – in areas requiring an extremely solid structure , a mixture of aggregate and cement can be used, which further strengthens the foundation.

The choice of suitable materials depends on the functions to be performed by the pavement and the characteristics of the soil.

Stella Green grass grid filled with infilled small stones. Photo source: own materials.

Laying the substructure – step by step

To properly prepare the substructure for the laying of Stella Green grass grid , you need to:

coring the entire area
level the ground and compact mechanically
lining the area with geotextile
fill with a base layer, then level and compact again with a compactor
re-lining the area with geotextile fabric
Spread loose material (e.g., sand), that is, the leveling layer and spread evenly
arrange the grating by connecting it to each other with hooks (in the case of SG1 and SG3 models) or with “click” catches (in the case of SG4 and SG6 models)
Spread aggregate (such as grass, gravel, sand)

Important: In the place of pedestrian traffic, the substructure should be 20cm, and in the place of traffic it should be 40cm.

See what a proper foundation should look like: https://www.youtube.com/watch?v=0hjnMeQ_B4c

You can see the details of each step in our instructions. Check it out -> https://installation.info.pl/jak-zainstalowac/

The process of laying the grid on a properly prepared substructure. Photo source: https://thepavingexperts.co.uk/product/vubagrid-1m2-cellular-paving-grid/

Summary

Importantly, without proper preparation of the subgrade, even the most precisely executed installation will not provide the expected results – the gratings may collapse, resulting in cracking and loss of load-bearing properties. Each step in preparing the substructure – from the excavation of the site, to the laying of the geotextile, to the filling of the grating – plays a key role in achieving a durable and functional pavement.

Our experience is confirmed by experts from Stella Green, who point out that a properly selected and carefully executed substructure is the foundation for the durability and reliability of any investment. That is why it is so important to follow step-by-step instructions and adjust the depth of the substructure to the expected load. A solid substructure is the foundation for the success of any investment with a Stella Green grass grid!

FAQS

1. What is a grass grid and why is it used?

A grass grid is an openwork panel made of durable recycled materials such as polyethylene. The main task of the grid is to harden and stabilize the ground, allowing the load to be evenly distributed and allowing the lawn to be properly protected. All this to prevent ruts and damage to parking lots, access roads or fire roads.

2. What are the advantages of using Stella Green brand geogrid?

Soil Stabilization – Grid increases the strength of the pavement, making it ideal for use on parking lots, paths and driveways.
Free migration of rainwater – the grating allows water to be naturally absorbed by the ground, preventing the formation of puddles and stagnation.
Eco-friendly landscaping – the trellis allows to preserve the natural appearance of the area, supporting green surfaces while strengthening the ground.

3. Can I install a grass grid without laying a foundation?

No, laying a substructure is necessary. A proper substructure prevents unevenness.

Important: In the place of pedestrian traffic, it should be 20 cm, and in the place of traffic, it should be 40 cm.

4. Is it possible to purchase an entire palette of grass grids?

Yes, per pallet, depending on the model and height of the pallet, there are between 176 and 336 grass grids. Stella Green brand eco-grating is available both in small quantities and in pallet quantities. Stella Green brand square grass grids – SG1 and SG3 – need exactly 4.56 pieces per 1 square meter. On the other hand, SG4 and SG6 rectangular grids need exactly 4.57 pieces per 1 square meter.

5. Where can grass grids be used?

Stella Green grass grids have a very wide range of applications and are ideal for parking lots, driveways, fire roads and grassy areas. Thanks to their design, they are ideal as soil stabilization in areas subject to heavy loads, such as parking lots and access roads. Grass grids can also be used to create garden paths, strengthen the ground and stabilize slopes.

6. Is the Stella Green gravel grid resistant to heavy loads and damage?

Yes, Stella Green gravel grids are tested for load resistance and comply with DIN EN 1072:1985. This means that they are strong enough to support the weight of vehicles, including cars, RVs or vans. When it comes to road construction, grass grids are an excellent solution.

Tests conducted by the German TÜV SÜD confirm their durability and reliability. The grass grids are resistant to compression, acids and other adverse weather conditions.

7. Are gras grids, geogrids and paving lot grids different products?

The nomenclature is used alternately due to the wide range of applications. In the case of Stella Green brand grass grids, there are 4 models of this product: SG1, SG3, SG4 and SG6. The common feature of these models is the material of manufacture, while they differ in dimensions (e.g. different wall thickness), colors and purpose.