What are the ground reinforcement grids made from?
Our Hebden X-Grids are made from recycled British industrial plastic, sourced in the Midlands.
Can they be used on a sloping driveway or access roads?
Yes they can. Depending on the gradient they may also need some of our U Pins or J Pins to fix them more firmly to the ground.
1 in 8, or 12%, is a reliable maximum.
What is the maximum weight of vehicle they can carry?
Calculations are done slightly differently, as this can depend on how many wheels, what size tyre and a number of other factors.
One of the main tests is how much weight can be applied to an un-filled square metre before it collapses, which is 420 tonnes in this case.
The maximum axle weight of 30 tonnes is a more practical indicator, as this shows that our grids are suitable for any UK road-legal vehicle, assuming the sub-base has appropriately installed for the type of traffic expected.
I’ve read on the internet that vans and lorries need 50mm or 80mm grids, not than the 40mm grids you supply. Is that true?
No, it isn’t at all true. Moulds for these type of products are costly, so when manufacturers have stock of 50mm and 80mm products it is understandable that they will want to get rid of them, but we have been selling 40mm grids to people like England Highways, various Police forces, the Ministry of Defence, Transport for London and many others since 2008.
How quickly can the grids be laid?
The grids arrive to you on a pallet and clicked together in nines to make a square metre, so once the base has been prepared, they can be laid by pretty much anyone at a rate of 100m2 per hour. It really is very swift.
Our area is prone to flooding. Are your grids any help to us?
93% of the grid is an open structure, meaning that the vast majority of rain that falls on them heads straight back to the water table, rather than being forced into an overburdened drainage system, as would be the case with tarmac.
Any method of “slowing the flow” of rain water reduces the risk and subsequent impact of flooding.
I want to be able to park on my lawn. Can I just roller the grids in?
No, sorry. You need to create the base layer and then grow the grass within the grids. See our installation guide for more information.
Why do I need angled chippings instead of pea gravel to fill my grids?
Angled chippings work their way into a more stable grouping when they have been travelled over a few times. This stability makes the overall surface stronger, although the whole installation will need topping up once the chippings have settled. This usually requires another 12-15% of filler material being added a couple of months after the surface has been used for the first time.
Why is the recommended size for chippings a 14-20mm blend?
Lots of vehicles, particularly SUVs and 4X4s, use tyres with deep treads. Using a 14-20mm blend ensures that the gravel does not then migrate in the tyres away from the site on to tarmac where it could become a skid risk.
I’m buying some grids for my driveway. Can I get a few extra to use for a base for my shed?
Absolutely. The Hebden X-Grids make an excellent damp-proof base for all sorts of things including sheds, greenhouses, hot tubs and garden rooms.
Are the grids available in colours other than black?
We used to supply them in green or white, but due to the very high costs involved and the fact that over 99% of orders were for black, these colours have now been discontinued. We apologise for any inconvenience caused.