Grass Event & Festival Areas
Ground that survives the build, the event and the breakdown
Events do not damage fields. Build week does. IBRAN grids reinforce the ground where the heavy work happens, so the site handles the traffic and the land goes back to normal afterwards.
Why reinforcement matters here
Ask anyone who runs an event field what wrecked it and the answer is rarely the crowd. It is the fortnight either side: artics delivering staging, telehandlers running back and forth, generator trucks, welfare units, and all of it on soft ground in whatever weather turns up.
Foot traffic does its own damage in concentrated spots, at gates, in front of stages, along the desire lines between arenas, but people spread out and grass recovers. Vehicles do not spread out. They follow the same route to the same compound, turning at the same point, and if the ground is wet they cut in and it is done.
Reinforcing that ground changes the economics of the whole event. The routes and compounds stay usable in bad weather, so the build does not stall. The land is not churned, so reinstatement is cheaper or unnecessary. And the ground is ready for the next one rather than needing a year off.
Where this works well
- Vehicle routes and haul roads across a site
- Production and artist compounds
- Stage, marquee and structure footprints
- Generator, welfare and cabin standings
- Entrance gates and pinch points
- Bar, food court and high-footfall areas
- Overflow parking and camping access
- Emergency and medical vehicle routes
At a glance
| Sub-base | 150-250mm open-graded MOT for vehicle routes. Less where the load is pedestrian |
| Infill | Sand-dominant rootzone for grass, or a 6-20mm graded blend for compounds and standings |
| Typical loading | Artics, telehandlers, cranes, cabins, generators, crowds |
| Appearance | Grass fill leaves a field that still reads as a field between events |
| Availability | Usable in wet weather, so build and breakdown are not weather-dependent |
| Permeability | Fully permeable. Water drains away rather than standing in front of a stage |
| Design life | 25 years, subject to documented installation |
| Material | 100% recycled polypropylene, made in the UK |
Permanent reinforcement or temporary trackway?
Most event sites hire trackway, and for a one-off in an unfamiliar field that is the right answer. For a site that hosts events year after year, the maths changes.
Trackway is a recurring cost with recurring labour: it arrives, it is laid, it is lifted, it goes away, and you pay again next year. It also has to be laid before the weather turns, which means committing to it early whether you need it or not.
Permanent reinforcement is one installation that is simply there. The grass grows through it, the field looks like a field, and every subsequent event uses ground that is already prepared. On the routes and compounds that get used every single time, that is usually the cheaper answer within a few seasons, and it removes a logistics job from every build.
The sensible approach on most sites is both: permanent reinforcement on the fixed infrastructure that never moves, and trackway for whatever changes with each event layout.
Which grid depth?
The number on a grid is a decision about how deep the confined layer is, and on an event site it follows the build traffic rather than the event itself.
- IBRAN®-X50 is our recommendation for vehicle routes, compounds and structure standings. Build traffic is heavy, it turns, and it arrives whatever the ground conditions.
- IBRAN®-X40 for lighter routes, overflow parking and mixed pedestrian and light vehicle areas.
- IBRAN®-X30 for pedestrian areas, walkways and camping ground where the build-up needs to stay shallow.
Specify against the heaviest vehicle in the build schedule, not the average one. On most sites that is a loaded artic or a telehandler, and both of them turn.
Choosing your fill
For areas that must stay green between events, use a sand-dominant rootzone filled level with the cell tops, with a hard-wearing amenity seed mix. The field reads as grazing or parkland for fifty weeks of the year and carries the event for the other two.
For compounds, standings and permanent haul routes, use a 6-20mm graded blend, angular and clean. A blend packs tighter than a single size because the smaller stone fills the gaps between the larger, and a fully bedded cell puts load through the stone rather than through the plastic. It gives a firm, predictable surface for cabins, generators and stacked kit.
Where a stone surface would look wrong, remember it can be topped: a stone-filled route under a thin turf or matting layer during the event gives you the structural surface and the appearance you want on the day.
How it goes in
- Map the fixed infrastructure first. Every site has routes, gates and compounds that are in the same place every year. Those are what to reinforce; the rest changes with each layout.
- Set out and establish falls. Event fields are often the flattest land available, which means water has nowhere obvious to go. Decide where it goes before you build.
- Strip turf and topsoil to a firm formation, removing soft spots rather than building over them.
- Lay a woven geotextile across the formation, lapping joins by at least 300mm. On agricultural ground this is structural, stopping the sub-base punching down into soft subsoil.
- Lay and compact an open-graded sub-base in 50mm layers, to a depth set by the heaviest vehicle in the build schedule.
- Blind with a thin levelling layer and screed flat.
- Push-fit the grids together, staggering the joints, and cut around gateposts, services and existing drainage.
- Restrain the edges, particularly along routes, where vehicles will otherwise clip the edge and drag the outer grids sideways.
- Fill the cells level with the cell tops and brush in. Seed or turf grass areas and allow a full growing season before the first event where you can.
Full step-by-step detail is in our grass grid installation guide.
Planning the build, not the event
The single most useful exercise is to walk the site with the build schedule rather than the event plan.
Where does the first artic go, and what does it drive over to get there? Where does the telehandler spend the week? Where do the cabins land, and what route did they come in on? Which gate takes every delivery, and where does a lorry turn round when it has unloaded?
Those answers give you a map of the ground that takes real punishment, and it is usually a surprisingly small proportion of the site. Reinforcing it costs a fraction of surfacing broadly and fixes most of the damage, because the damage is concentrated exactly where the heavy plant repeats the same movements.
Add the emergency and medical routes to that map. Those have to work regardless of weather, and unlike the rest of the schedule you do not get to reschedule them.
Crowd areas and pinch points
Foot traffic does not rut ground the way vehicles do, but it destroys grass where it concentrates: entrance gates, the front of a stage, bar frontages, the route between two arenas, and the toilets.
Those areas turn to mud through sheer repetition, and once they do they become both a welfare problem and a reputational one, since mud is what ends up in the photographs.
Reinforcement keeps the ground firm and free-draining under crowd loading, so a wet weekend produces a damp field rather than a quagmire. For sites that market themselves on comfort, that is worth more than the construction cost.
Handing the land back
Many event fields are rented, borrowed or dual-purpose: grazing, sports pitch, parkland, farmland. The obligation to return them in good condition is often the binding constraint on whether an event can happen at all.
A grass-filled grid is invisible once established, so the land continues in its normal use between events. It stays fully permeable, so it does not change drainage on the holding. And because the ground is not churned, reinstatement after each event is minor rather than a major earthworks job.
If you are negotiating a multi-year agreement with a landowner, the ability to say the ground will not be damaged is a considerably stronger position than promising to repair it afterwards.
Get it right first time
The one thing worth knowing: build for the wettest version of your build week.
Every event site is specified against a reasonable weather assumption, and then one year it rains for the entire build. That is the week that decides whether the ground survives, because a heavy vehicle on saturated ground does more damage in one pass than a hundred passes in the dry.
Specify the routes and compounds for the bad year rather than the average one. It costs a little more once, and it removes the scenario where the build stalls, the ground is destroyed, and the reinstatement bill arrives on top of an event that already went badly.
Ask our engineer
Questions about depths, which areas to reinforce, or how this compares to trackway hire? Ask below, or get in touch directly.
Common Questions
What actually damages an event field?
Rarely the crowd. It is the fortnight either side: artics delivering staging, telehandlers running back and forth, generator trucks and welfare units, all on soft ground in whatever weather turns up.
People spread out and grass recovers, but vehicles follow the same route to the same compound and turn at the same point, and on wet ground that is what does the lasting damage.
Is permanent reinforcement better than hiring trackway?
For a one-off in an unfamiliar field, trackway is the right answer. For a site hosting events year after year, permanent reinforcement on the routes and compounds that never move is usually cheaper within a few seasons and removes a logistics job from every build.
Most sites end up doing both: permanent reinforcement on fixed infrastructure, trackway for whatever changes with each layout.
Which areas of a site should be reinforced?
Walk the site with the build schedule rather than the event plan. Where does the first artic go and what does it drive over? Where does the telehandler spend the week? Which gate takes every delivery and where does a lorry turn round?
That map is usually a surprisingly small proportion of the site, and it is where the damage concentrates. Add the emergency and medical routes, because those have to work regardless of weather.
Which grid depth does an event site need?
The 50mm grid for vehicle routes, compounds and structure standings, because build traffic is heavy, it turns, and it arrives whatever the ground conditions. The 40mm for lighter routes, overflow parking and mixed pedestrian and light vehicle areas. The 30mm for pedestrian areas and camping ground where the build-up needs to stay shallow.
Specify against the heaviest vehicle in the build schedule, not the average one.
Will the field still look like a field between events?
With a grass fill, yes. Grass grows up over the cell tops and the reinforcement is invisible once established, so the land continues in its normal use as grazing, sports pitch or parkland.
Mowers pass straight over because the cell tops sit below the growing crown.
Does reinforcement help with crowd areas and mud?
Yes. Foot traffic destroys grass where it concentrates: entrance gates, the front of a stage, bar frontages, routes between arenas and the toilets.
Reinforcement keeps those areas firm and free-draining under crowd loading, so a wet weekend produces a damp field rather than a quagmire. For sites that market themselves on comfort, that is often worth more than the construction cost.
What should event site grids be filled with?
A sand-dominant rootzone with a hard-wearing amenity seed mix for areas that must stay green between events. A 6-20mm angular graded blend for compounds, standings and permanent haul routes, where a firm predictable surface matters more than appearance.
Where a stone route needs to look right on the day, it can be topped with turf or matting for the event.
How long before a new installation can host an event?
For grass areas, allow a full growing season before the first event where the programme permits, because the surface is only as strong as the root structure holding the rootzone together.
Stone-filled compounds and routes are usable as soon as they are laid and filled. Where time is short, use turf rather than seed and phase the areas that establish first.
Does it help when the land is rented or dual-purpose?
Considerably. Many event fields are grazing, sports pitch or farmland, and the obligation to return them in good condition often decides whether an event can happen at all.
Because the ground is not churned, reinstatement after each event is minor rather than a major earthworks job, and being able to tell a landowner the ground will not be damaged is a stronger position than promising to repair it.
Will it work if the build week is wet?
That is the case to specify for. A heavy vehicle on saturated ground does more damage in one pass than a hundred passes in the dry, so build the routes and compounds for the bad year rather than the average one.
A reinforced, fully permeable surface stays usable when the surrounding ground does not, which keeps the build on schedule rather than stalling it.
Ask our engineer
Questions about depths, sub-base, edging or which system fits your project? Ask below.
