Grusparkeringspladser – permeable parkeringsgitre
Grusparkeringspladser
En permeabel parkeringsplads der forbliver plan. IBRAN-gitre holder stenen på plads, så overfladen klarer daglig trafik, afleder vand der, hvor det falder, og opfylder kravene til afvandingsstrategi – uden en dråbe asfalt.
Derfor er armering afgørende her
Løst grus svigter hurtigst præcis der, hvor en parkeringsplads arbejder hårdest: vendecirkler, indkørsler til båse, tilkørslen til en bom. Stenen vandrer under bremsning og styring, hjulspor opstår, og inden for en sæson er du tilbage med endnu en leverance tilslag.
Et cellegitter holder stenen på plads, så den ikke kan bevæge sig. Belastningen ledes stadig gennem fyldet og ned i undergrunden, men stenen forbliver sammenlåst og ligger, hvor den blev lagt. Det forvandler grus fra en overflade, du vedligeholder, til en overflade, du projekterer.
Den afleder også vand. På et erhvervsanlæg er det sjældent blot en fordel – det er typisk en betingelse i tilladelsen.
Typiske anvendelser
- Erhvervs- og medarbejberparkeringspladser
- Detail-, hotel- og besøgsparkering
- Servicegårde og lastbilzoner
- Adgangsveje og interne pladsveje
- Landbrugs-, landlige og private parkeringspladser
- Overløbsbåse ved siden af eksisterende fast belægning
- Handicapbåse og gangstier
Overblik
| Bærelag | 150-200mm komprimeret stabilt grus, afhængigt af trafik og bundforhold |
| Fyld | 6-20mm graderet blanding, kantet og rent, fyldt i niveau plus 5-10mm afretning |
| Typisk belastning | Personbiler, varevogne, leveringskøretøjer og lejlighedsvis lastbilkørsel |
| Permeabilitet | Fuldt permeabelt. Indgår normalt som en LAR-komponent i afvandingsstrategien |
| Tilgængelighed | Et tæt pakket graderet fyld giver en fast, plan overflade, der er egnet til handicapbåse og gangstier |
| Båsafmærkning | Kontrasterende tilslag eller båsmarkører fastgjort i gitteret |
| Designlevetid | 25 år, forudsat dokumenteret udførelse |
| Materiale | 100% genanvendt polypropylen, bæredygtigt fremstillet i EU |
Sådan udføres det
- Afsæt arealet og fastlæg fald. Selv en fuldt permeabel overflade skal have et sted, vandet kan løbe hen ved kraftig regn – og niveauer er langt lettere at rette nu end efter bærelaget er lagt.
- Udgrav til dybden af bærelag plus gitterdybde plus afretningslag. Fjern bløde partier frem for at bygge hen over dem.
- Læg et vævet geotekstil over formationsplanet med mindst 300mm overlapning ved samlinger, så bærelag og undergrund ikke kan blande sig, og den dybde, du har betalt for, forbliver intakt.
- Læg og komprimer bærelaget i 50mm lag. At komprimere den fulde dybde i ét gennemløb virker ikke, uanset hvilken komprimator der bruges.
- Afret med et tyndt lag grussand og skrab det plant.
- Sammenklip gitrene over arealet, arbejd fra én kant og forskyd samlingerne. Skær rundt om afvandingsrender, kantsten og lygtepæle med en stiksav eller en fintandet sav.
- Afgræns alle åbne kanter. På en parkeringsplads optager omkredsen belastninger, som det sammenlåste felt ikke gør.
- Fyld cellerne med en 6-20mm graderet blanding, i niveau plus 5-10mm afretning, og arbejd det ind med en stiv kost, så ingen celle efterlades hul.
Fuld trin-for-trin vejledning findes i vores monteringsvejledning til grusgitre.
Valg af sten
Brug en graderet blanding af 6-20mm, kantet og rent. De fleste anvisninger peger på én enkelt størrelse, og én størrelse efterlader hulrum: ensartet sten hvælver mod sig selv og pakker aldrig helt solidt. En blanding udfylder disse mellemrum, fordi den mindre sten kiler sig ind mellem den større.
På en parkeringsplads betyder det dobbelt. En fuldt fyldt celle leder belastningen gennem stenen og ned i undergrunden; en halvfyldt celle leder den gennem plasten i stedet. Og en tæt pakket overflade er en fast overflade – det er det, der gør grus brugbart til handicapbåse og gangstier frem for noget, man skal undskylde.
Bed din leverandør om vasket graderet tilslag, kantet frem for rundet. Undgå finstof og skærver: de binder overfladen og fjerner den permeabilitet, som afvandingsstrategien er afhængig af.
Afmærkning af båse
Du kan ikke male en streg på grus, men du har to bedre muligheder.
Kontrasterende tilslag er det enkleste: fyld bådivisionerne med en anderledes farvet sten undervejs. Det kræver ingen vedligeholdelse, kan ikke slides af, og ser gennemtænkt ud frem for provisorisk.
Alternativt kan båsmarkører fastgøres direkte i gitteret og give en defineret kant til båse, handicappladser og gangstier. Begge løsninger holder langt længere end maling på asfalt, hvilket er værd at medregne i totalomkostningen.
Which grid depth?
The number on a grid is a decision about how deep the confined stone layer is, and on a commercial site that decision usually belongs to the drawing rather than to preference.
- IBRAN®-X50 is our recommendation for commercial car parks. Use it where a specification calls for a deeper confined layer, where traffic is daily rather than occasional, or where you want design margin on a surface that has to stay flat for decades.
- IBRAN®-X40 for lighter-use car parks, staff parking and rural sites without sustained commercial traffic.
- IBRAN®-X30 where you are surfacing over existing concrete or tarmac, or finished levels are constrained by thresholds and drainage.
If you are between two options, take the heavier duty one. The cost difference across a car park is small next to closing it to relay the surface.
Get it right first time
The one thing worth knowing: build the sub-base properly, in layers.
Everything above the sub-base can be corrected. Stone can be brushed back level, a grid can be lifted and reset, an edge can be restrained after the fact. A sub-base compacted in one pass rather than in 50mm layers cannot be fixed without taking the surface up, and it will show as settlement in the busiest parts of the car park within the first two winters.
It is the cheapest part of the job to get right and by far the most expensive to get wrong.
Design your surface
Set out the area, choose a grid and an infill, and see the finished surface. The schedule and the specification follow.
Permeable surface specification
Schedule
Assumptions
Specification
Common Questions
Is a gravel car park suitable for daily commercial traffic?
Yes, when the stone is confined in a cellular grid and the sub-base is built for the loading. Load passes through the aggregate into the ground beneath, and the cell walls stop the stone migrating under braking and steering.
Specify against the heaviest vehicle that will use the site rather than the average, and use the 50mm grid where traffic is daily rather than occasional.
How do you mark out parking bays on gravel?
Two options, both better than paint. Fill the bay divisions with a contrasting colour aggregate as you lay, which needs no maintenance and cannot be scuffed off. Or fix bay markers directly into the grid for a defined edge on bays, accessible spaces and pedestrian routes.
Both outlast line marking on tarmac, which is worth factoring into the whole-life cost.
Is a gravel car park wheelchair accessible?
A stabilised gravel surface filled with a densely packed graded blend gives a firm, level surface suitable for accessible bays and pedestrian routes.
The key is the fill. A graded blend packs solid, where single-size stone leaves voids that castors and walking aids drop into. Loose unconfined gravel is not suitable.
Does a gravel car park count towards SuDS requirements?
A stabilised gravel surface is fully permeable, so water infiltrates where it falls rather than running off into a drainage network. It is normally treated as a component within a wider drainage strategy.
Permeability depends on the fill being clean and free of fines, which is why the stone specification matters as much as the sub-base.
What sub-base does a gravel car park need?
150mm to 200mm of compacted MOT, depending on traffic and ground conditions, laid and compacted in 50mm layers.
Compacting the full depth in one pass does not work whatever the compactor, and an under-built sub-base shows as settlement in the busiest parts of the car park within the first two winters.
What size gravel should a car park use?
A graded blend between 6mm and 20mm, angular and washed. 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.
Avoid rounded shingle, which rolls rather than interlocking, and anything carrying fines, which binds the surface and costs you permeability.
How does the cost compare to tarmac?
Installed cost is typically lower, and the whole-life difference is larger still. There is no resurfacing cycle, no crack repair and no line repainting, and the permeability often removes the need for the additional drainage infrastructure an impermeable car park requires.
Materials and groundworks vary by site, so ask us for a build-up and quantities against your area.
Can you lay grids over an existing tarmac or concrete car park?
Yes, provided the existing surface is sound and you have somewhere for water to go. Fill any holes, check your finished levels against thresholds and drainage, and use the 30mm grid to keep the build-up shallow.
If the existing surface is badly broken it usually has to come up, because breakage normally means the base beneath has already failed.
Do gravel car parks need edging?
Every open edge should be restrained. The perimeter takes load that the interlocked field does not, so without restraint the outer grids lift, spread and separate over time.
Use ramp edging at entrances and against thresholds, and edging strips where the surface meets soft ground.
How much maintenance does a gravel car park need?
Very little. Check levels after the first winter and brush any settled cells back up. Because the stone is confined it does not migrate, so there is no raking, no annual top-up and no resurfacing cycle.
The grid carries a 25 year warranty subject to documented installation.
Ask our engineer
Questions about depths, sub-base, edging or which system fits your project? Ask below.
