Grass Reinforcement Mats for Playgrounds – Safe Openwork Surface (HIC)
Grass Reinforcement Mats for Playgrounds with HIC and PZH Certification
Rubber grass reinforcement mats, also referred to as openwork mats or rubber grass grids, are a safe, biologically active surface that combines two key functions: fall protection in accordance with the HIC parameter and preservation of the natural appearance of the lawn. The open honeycomb structure allows grass to grow through freely and enables unobstructed water drainage, eliminating puddle formation and preventing surface subsidence during heavy rainfall. Safe openwork playground mats are used under swings, slides, and in recreational zones. They ensure ground stability and provide an anti-slip surface, reducing the risk of injuries and allowing year-round use.
What are overgrowth mats and what are their key characteristics?
Grass-growth mats are modern, openwork surfaces made of durable rubber, which combine safety, durability and a natural appearance. Their unique construction with holes allows free grass growth, thanks to which after a few weeks from installation they become almost invisible in a green environment. The most important function of the grass-growth mats is effective fall attenuation – confirmed by an HIC certificate for heights up to 3 meters – which makes them an ideal choice for playgrounds, outdoor gyms, sports fields and other recreational areas.
The mats are resistant to abrasion, UV radiation, frost and moisture. Thanks to the use of rubber from recycling they are an environmentally friendly solution. Their installation does not require an expensive subbase – a levelled ground or lawn is sufficient. This makes them not only economical, but also quick and easy to install.
The mats are available in black and green, in standard dimensions 1500 × 1000 × 23 mm, weighing approximately 12 kg each.
Technical specification table of grass reinforcement mats
| Parameter | Value / Typical Range | Technical Notes |
|---|---|---|
| Dimensions | 1500 × 1000 mm | Other formats available |
| Thickness | approx. 22–23 mm | Typical value for impact-attenuating surfaces |
| Weight | approx. 11–15 kg/piece | Dependent on compound density |
| Material | SBR/NR rubber granulate | Recycled (SBR) with addition of natural rubber (NR) |
| Structure | Openwork, perforated | Allows grass growth and water infiltration |
| Water permeability | High | No water stagnation with proper installation |
| Operating temperature range | approx. -30°C to +60°C | Typical for SBR/NR compounds in outdoor applications |
| Abrasion resistance | Good | Characteristic property of rubber granulate |
| Weather resistance | Designed for outdoor applications | Stabilised due to carbon black content and anti-ageing additives |
| Frost resistance | Yes (operational) | Maintains flexibility in winter conditions within typical operating range |
| HIC parameter | Dependent on substrate configuration | Critical fall height confirmed by testing according to PN-EN 1177 (for specific mat and substrate) |
| Test standard for impact-attenuating surfaces | PN-EN 1177:2019 | Standard defining the test method and HIC determination |
| Application with playground equipment | Design compliant with PN-EN 1176 | PN-EN 1176 applies to equipment; surface selection is made according to installation requirements |
| Installation | On levelled and compacted ground | Substrate influences stability and impact attenuation parameters |
| Warranty | Market standard often ranges from 2–5 years |
Rubber grass reinforcement mats offered by Power Rubber meet the highest technical and safety standards. Their openwork structure ensures excellent water permeability, eliminating puddles even during heavy rainfall. A thickness of 22–23 mm guarantees effective fall impact attenuation from heights of up to 3 metres, confirmed by an HIC certificate in accordance with PN-EN 1177:2019.
Installation does not require an expensive substructure – levelled ground or lawn is sufficient. This makes them not only economical but also quick and easy to install. The mats are available in black and green, in standard dimensions of 1500 × 1000 × 23 mm, with a weight of approximately 12 kg per piece.
Applications of overgrowth mats – where are they most often used?
Vegetation growth mats are a universal solution that is used in many places requiring a safe, durable and aesthetic surface. The most common areas of use are:
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Playgrounds (under swings, slides, carousels, climbing frames)
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Outdoor gyms and fitness parks
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Preschools and schools (gardens, sports fields, recreational areas)
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Sports and recreational fields (e.g., for football)
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City parks and green areas
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Slopes, embankments, inclined areas (protection against erosion)
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Temporary walkways on construction sites
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Event areas and outdoor events
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Pedestrian walkways, entrance zones, access paths
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Garden terraces, designated relaxation zones
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Golf courses, recreation areas in hotels and holiday resorts
Such a wide range of applications results from the combination of safety, ease of installation, resistance to weather conditions and the natural appearance of vegetation growth mats. They are particularly valued on playgrounds and outdoor gyms, where they effectively cushion falls and minimize the risk of injuries, while allowing the green, natural character of the area to be maintained.
Key benefits of grass reinforcement mats in outdoor applications
High level of user safety
The honeycomb-structured mat creates an even and stable surface that prevents ground subsidence in areas of intensive use. The openings in the mat allow free water drainage, keeping the entire surface dry and anti-slip, which minimizes the risk of slipping, tripping, or falling. The elastic, shock-absorbing structure of the material increases the safety of both children and adults while maintaining the natural appearance of the lawn and the function of a biologically active surface.
Effective fall protection (HIC)
Grass reinforcement mats with HIC certification effectively reduce the risk of injuries during play. The HIC parameter (Head Injury Criterion) allows the surface thickness to be precisely matched to the height of playground equipment such as swings, slides, ladders, or climbing walls, ensuring controlled impact absorption. As a result, each play area meets applicable safety standards.
Natural lawn appearance
The open, perforated structure of the mat enables free grass growth, allowing the natural appearance of the lawn to be preserved. The surface combines aesthetic and practical functions by stabilizing the ground and creating an even play surface without irregularities, while maintaining a cohesive and visually attractive area. Openwork mats are ideally suited for public spaces, parks, gardens, playgrounds, and recreational zones, enabling designers to create safe and functional environments.
Subsoil stability and year-round use
The rubber grass grid limits the formation of ruts, subsidence, and localized surface irregularities. The openwork structure allows rainwater to drain freely into the ground, preventing the surface from becoming muddy and eliminating standing water. Safe openwork playground mats retain their functional properties regardless of the season, including during heavy rainfall and under low-temperature and frost conditions.
Easy and quick installation
Installation of honeycomb-type mats does not require a base layer or concrete screed. It is sufficient to level the ground and clear the substrate of roots, branches, and metal elements, which significantly reduces the scope of construction work and shortens project execution time. The modular design allows precise adaptation to the terrain shape. Individual mats are connected using cable ties and anchored to the ground with mounting pegs. This fixing method prevents mat displacement during use and ensures a stable, uniform surface. Properly installed rubber grass grids do not cause surface unevenness, deformation, or edge separation.
How to install grass reinforcement mats on grass?
Proper installation of overgrowth mats, also called rubber grass meshes, provides effective fall cushioning (HIC) and an attractive, natural grass appearance. Installation does not require a concrete subbase or specialized tools.
How to install overgrowth mats on grass? - Step-by-step instructions
- Preparation: Cut the grass to a minimum height (approx. 2–3 cm). Remove stones, roots, branches, and metal elements. Level the ground (the overgrowth mat functions as a safe biologically active surface - a concrete slab is not required!).
- Laying: Lay the openwork/mesh mats directly on the grass. If necessary, they can be trimmed with an upholstery knife. The mat should not create local unevenness (bulges and humps).
- Fixing: Connect the mats together with cable ties (zip ties) at 20 cm intervals and secure to the ground with mounting pegs. Remember to use two cable ties at the corners, installing them in a cross. After tightening, cut off any protruding straps with scissors.
- Backfilling (optional): Cover the holes with fertile soil. For a faster "disappearance" of the overgrowth mat you can overseed grass in the filled areas. Water the surface without washing soil out of the holes.
After installation is complete, it is worth checking the stability of the entire surface. Make sure the rubber grass mesh lies evenly against the ground. The surface is ready for use. The full effect will be visible after a few weeks, when the grass begins to grow through the openwork structure, creating an attractive, green and at the same time safe biologically active surface.
Required tools: protective gloves, scissors or a cutting knife, rubber mallet, cable ties, mounting pegs, optionally a stabilizing mesh.
Installation of overgrowth mats is intuitive and does not require specialized equipment. This saves investors time and resources, and the surface is ready for use almost immediately after installation.
Care and maintenance of overgrowth mats
Rubber overgrowth mats are practically maintenance-free, however, to preserve their aesthetics and functionality it is recommended to follow a few simple rules:
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Mowing the grass – grass growing through the mat is mowed the same way as the rest of the lawn. It is advisable to exercise caution when driving on and off with a mower – the blades should be raised so as not to damage the mat.
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Removing weeds – regular removal of weeds ensures an aesthetic appearance and prevents the mat from being overgrown by unwanted plants.
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Cleaning the mats – if the mat becomes dirty it can be washed with water or cleaned with a brush. Harsh chemical agents should not be used.
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Checking the fastenings – periodically check whether the pegs and securing straps are in place and do not require replacement.
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Avoid covering the mats with soil or aggregate – covering the mat may reduce its cushioning properties and prevent grass from growing through.
Thanks to these simple measures the overgrowth mats retain their properties for many years, and the area remains safe and attractive.
Certificates and compliance with standards
Overgrowth mats from Power Rubber meet the highest safety and quality standards, as confirmed by the following certificates and attestations:
- PN-EN 1177 - the European standard concerning shock-absorbing surfaces on playgrounds.
- BS EN 4790:1987 - the standard provides a guarantee that an accidentally ignited fire will not spread over the entire surface.
- PZH Hygienic Certificate - issued by the National Institute of Public Health – National Institute of Hygiene, confirms the safety of the product in contact with the skin and the environment.
- HIC Certificate (Head Injury Criterion) - confirms effective cushioning of falls from heights of up to 3 meters, in accordance with PN-EN 1177:2019.
Our surfacing has been tested in accordance with the British Standard:
BS EN 1177:2008 obtaining a Positive Result regarding the critical fall height, aimed at ensuring safety for children in the event of their sudden downward change in height on playgrounds.
BS 7188:1998+A2:2009 guiding the methodology of the tests carried out.
Possession of the above certificates guarantees that the overgrowth mats are safe for users, durable and environmentally friendly. These certificates are required in public tenders and during technical acceptance of playgrounds and recreational areas.
How to choose rubber grass reinforcement mats for a specific application?
The HIC (Head Injury Criterion) parameter defines the maximum height from which a child can fall onto the surface without the risk of serious head injuries. The table below presents the selection of grass reinforcement mat thickness in relation to the height of playground equipment, in accordance with the HIC certificate.
The selection of grass reinforcement mat thickness should always be adapted to the height of playground equipment and the intensity of use.
The Free Fall Height (FFH) of HIC-certified grass reinforcement mats with a thickness of 23 mm from Power Rubber is 3 m. The FFH depends on the type and degree of compaction/looseness of the subbase as well as its grain size.
Why are grass reinforcement mats a safe biologically active surface?
A safe biologically active surface is a semi-permeable surface that provides effective impact absorption, rainwater retention, and plant growth, including grass. Grass reinforcement mats are an example of this, as their openwork, perforated honeycomb structure allows grass and other vegetation to grow through the surface while preserving the natural function of the soil. The openings in the mats enable free drainage of rainwater, eliminating puddle formation and surface unevenness while supporting water retention in the subsoil. As a result, the ground remains stable and level, allowing year-round use of playgrounds and recreational areas. Additionally, the elastic material of the mats (SBR/EPDM rubber) effectively absorbs impacts, reducing the risk of falls and injuries, which makes grass reinforcement mats a safe and functional solution for children, parents, and landscape designers.
Frequently Asked Questions (FAQ) – Openwork Mats
Will a lawn mower damage the grass reinforcement mat?
No, provided the grass is mowed to an appropriate height and the mat has properly integrated into the ground. A correctly installed openwork mat for a playground or garden is positioned below the mower blade cutting line. Grass grows through the openings of the mats, forming a natural protective layer.
Can wheelchairs and baby strollers be used on grass reinforcement mats?
Yes, grass reinforcement mats stabilize the ground and prevent wheels from sinking into mud or soft soil. A wheelchair or baby stroller can move smoothly and steadily across the surface without wheel blockage. It is also worth noting that honeycomb grass mats improve traction and evenly distribute the load over a larger surface area, preventing rut formation and eliminating bogging after rainfall.
Is an openwork playground mat frost-resistant?
Yes, openwork playground mats are frost-resistant. They are made of high-quality EPDM/SBR rubber designed for outdoor applications. The honeycomb-structured rubber mat retains its elasticity and functional properties at low temperatures, which means it does not crack during frost nor degrade due to precipitation or changing outdoor weather conditions. It does not absorb water and is resistant to aging caused by long-term UV exposure. It can be used year-round without the need for dismantling during the autumn–winter period.
Can grass reinforcement mats be installed without a concrete screed?
Yes, grass reinforcement mats are designed for installation directly on natural ground, without the need for a concrete subbase. It is sufficient to compact and level the soil and remove branches, roots, stones, and metal elements that could cause point loads, local unevenness, or surface bulging.
Does a rubber grass grid sink during rain and form puddles?
No, a properly installed rubber grass grid enables rapid drainage of rainwater into the subsoil, eliminating the risk of puddle formation and water stagnation. The openwork structure of the mat stabilizes the ground, limiting the formation of subsidence and surface unevenness. The mat demonstrates high resistance to adverse weather conditions, including heavy rainfall, temperature fluctuations, and frost, which allows it to retain its functional properties and be suitable for year-round use.
Do openwork mats meet safety standards for playgrounds?
Yes, grass reinforcement mats meet the requirements of the EU standard EN 1177, which defines the required surface thickness for a given material to effectively absorb impact energy and reduce the risk of serious head injuries. The key indicator is the HIC (Head Injury Criterion) parameter, which specifies the maximum fall height at which the surface provides effective protection.
Can rubber grass reinforcement mats be classified as biologically active surface (BAS)?
Grass reinforcement mats constitute a safe and biologically active surface in public spaces, playgrounds, parks, and private areas. They are classified as a biologically active surface (BAS), which contributes to meeting the requirements of building law and local guidelines of local spatial development plans (LSDP).
From a regulatory perspective, a biologically active surface is an area that enables natural plant vegetation and the retention of rainwater, while maintaining the ecological functions of the ground.
In Polish construction law and design practice, for grass reinforcement mats filled with fertile soil and sown with grass, it is standardly assumed that 50% of the surface can be classified as BAS. It is essential that the surface is installed on a permeable subbase that allows proper water drainage. Each time, it is recommended to verify compliance with the LSDP or Development Conditions (DC) in order to correctly calculate the biologically active surface for the entire area.
Certified grass reinforcement (openwork) mats for playgrounds can be purchased from Power Rubber.
Are grass reinforcement mats safe for children and do they have the appropriate certifications?
Yes, the rubber grass reinforcement mats offered by Power Rubber hold an HIC (Head Injury Criterion) certificate confirming fall impact attenuation from heights of up to 3 metres, as well as a PZH hygienic certificate. They comply with the requirements of PN-EN 1177:2019 and the latest guidelines concerning safety on playgrounds and recreational areas.
How is the installation of grass reinforcement mats carried out and does it require specialist tools?
The installation of grass reinforcement mats is simple and does not require specialist tools or a costly substructure. The mats are laid directly on levelled ground or lawn, connected with cable ties and fixed to the substrate with pegs. The installation of rubber grass reinforcement mats has been described in the section above.
How should grass growing through the reinforcement mat be maintained and is mowing impeded?
Grass growing through the reinforcement mat is mown with the same frequency as the rest of the lawn. The openwork structure of the mat does not hinder grass growth or its maintenance. However, caution is recommended during mowing – the mower blades should be raised when entering and leaving the surface covered with mats in order to avoid damage to both the mat and the equipment.
Do grass reinforcement mats require maintenance or special care procedures?
Grass reinforcement mats do not require specialist maintenance. In case of contamination, they can be washed with water or cleaned with a brush. Regular mowing of the grass and removal of weeds are sufficient to ensure that the surface remains aesthetically pleasing and safe to use.
What does the HIC parameter mean in grass reinforcement mats?
HIC defines the maximum safe fall height. The mats can achieve an HIC value of up to 3 metres.
Do grass reinforcement mats allow water to pass through?
Yes. The openwork structure ensures full water permeability and eliminates puddles.
Does grass grow through the reinforcement mat?
Yes. The openings in the mat allow natural grass growth.
How long does it take for grass to grow through the reinforcement mat?
Usually 4–8 weeks, depending on weather conditions.
Is the installation of grass reinforcement mats difficult?
No. The installation is simple and can be carried out independently.
On what type of substrate can grass reinforcement mats be installed?
On grass, soil, sand or mixed substrate.
Can grass reinforcement mats be installed on concrete?
It is not recommended, as grass will not grow through and impact attenuation will be limited.
Are grass reinforcement mats anti-slip?
Yes. The rubber provides a high level of slip resistance, even on a wet surface.
What are the standard dimensions of grass reinforcement mats?
Most commonly 150 × 100 cm or 100 × 100 cm.
What is the thickness of grass reinforcement mats?
Usually 16–25 mm, depending on the model.
Can grass reinforcement mats be cut to size?
Yes. They can be cut with a utility knife.
Are grass reinforcement mats heavy?
The weight is usually 8–12 kg per piece.
Are grass reinforcement mats environmentally friendly?
Yes. They are made of recycled rubber and support natural grass growth.
Are grass reinforcement mats suitable for playgrounds?
Yes. This is one of their main applications.
Are grass reinforcement mats suitable for outdoor gyms?
Yes. They provide a stable and safe surface for fitness equipment.
Can grass reinforcement mats be used in the garden?
Yes. They protect the lawn and stabilise the substrate under garden furniture.
Are grass reinforcement mats resistant to damage?
Yes. The rubber is flexible and resistant to intensive use
Do grass reinforcement mats protect the lawn from damage?
Yes. They distribute the load and prevent the lawn from being worn down.
Are grass reinforcement mats resistant to mould and fungi?
Yes. The rubber does not absorb moisture and does not promote the growth of microorganisms.
Can grass reinforcement mats be used on slopes?
Yes, provided that they are properly anchored.
Are grass reinforcement mats safe for animals?
Yes. They are safe for dogs and other animals.
Do grass reinforcement mats have a PZH certificate?
Many models do — it depends on the specific product.
Do grass reinforcement mats comply with EN 1177?
Yes, if they have the appropriate HIC tests.
How long do grass reinforcement mats last?
On average 8–12 years, depending on the intensity of use.
Can grass reinforcement mats be relocated to another location?
Yes. The installation is reversible.
Are grass reinforcement mats suitable for grass parking areas?
Yes, but only high-strength models.
Can grass reinforcement mats be used under a garden pool?
Yes, but the grass will not grow through in this case.
How should grass reinforcement mats be cleaned?
Water under pressure or a brush is sufficient.
Are grass reinforcement mats available in different colours?
Most commonly black and green, but other variants are also available.
Can overgrowth mats be combined with other surfaces?
Yes. They can be combined with rubber tiles, grass and sand.
Are przerostowe mats resistant to oils and chemicals?
They are resistant to most substances, but contact with solvents is not recommended.
Are overgrowth mats suitable for year-round use?
Yes. They can be used throughout the year, regardless of the weather.
What are the alternatives to przerost mats on the playground?
An alternative to grow-through mats is rubber tiles for playgrounds. Rubber tiles create a uniform, elastic shock-absorbing surface, ideal for playgrounds, outdoor gyms and recreational areas. Unlike grow-through mats, they do not require turf and can be used on concrete or bedding. They provide high resistance to weather conditions, slip resistance and ease of cleaning.
Grass Reinforcement Mat Installations on Playgrounds – User Safety and Surface Aesthetics
