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Is Gravel Suitable on a Sloping Driveway?

By: Chris Hogan MSc - Updated: 25 Apr 2017 | comments*Discuss
 
Gravel Cobbles Concrete Drive Substrate

Q.

I'm building a house and would ideally like a gravel driveway to fit in with the rural location. However, the drive will have a 1:12 slope, and I suspect this would mean gravel is impractical. I don't like concrete or tarmac particularly, and any block paving would need to avoid looking "suburban". Are there any other options that would work on a slope such as mine?

(Mr Mark Laird, 13 January 2009)

A.

You're absolutely right, gravel will be impractical for a drive with a slope like that. Quite apart from the constant topping up that you'd need to do, because the gravel will naturally roll downhill when someone drives over it and whenever it rains hard, there be a health and safety aspect. Shoes would sink into a thick layer of gravel, which would be more likely to stay in place on a 1:12 slope, and a thin layer would roll on the supporting bed of concrete or other hardstanding.

Both would be very tricky for people to walk on, particularly the elderly, and in some circumstances you might even have trouble getting traction in a vehicle.

However, it is quite understandable to want to avoid the 'suburban' look of Block Paving. The good news is that there are a couple of ideas that could work and give you the look you're after.

Try Small, Rounded Cobbles

First, you could try setting small cobbles into a concrete substrate, a technique that's covered in our 'Loose Materials' section (see Advice on Hoggin, Cinders and Ash Driveways). If you chose small, rounded cobbles, you’d get close to the look of gravel. But the aggregate would be set in the bedding layer, so it wouldn’t be off down the hill at the first opportunity.

It can be uncomfortable to walk on though, so you might consider gravel or paving stones for the paths leading from the house to the drive.

Cellular Mats

The second option would be to look at some of the newer cellular supporting structures for drives. Again we've covered these on the site (see Cellular Paving Systems For Your Driveway) but focusing on their use as a material that will allow grass to grow through them. The good news is that you can use these cellular mats with the cells filled up with gravel instead of letting grass grow through them.

On a 1:12 slope, you would almost certainly still lose gravel to some extent, so occasional topping up would be necessary. This will be particularly so after a six-month bedding-in phase, as the gravel compacts in the cells. But after that it should work well. An edging course might be a good idea, as that would restrain any gravel that escapes from the cells.

Get the Colour and Substrate Right

Choose a cellular mat that's as close in colour as you can get to the gravel you are using, so that if it does start to poke through as the gravel compresses it won’t be so obvious.

Also talk to the supplier or manufacturer of the mat about what layers, either membranes or substrates, to put down underneath it. You'll need to ensure that the mats will stay in place on that slope and that gravel isn't compressed straight through into the soil below to disappear.

Good luck!

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[Add a Comment]
In response to Guy I am unaware of a 5 cm plastic fencing product can you give me a name of the product
Doug - 25-Apr-17 @ 7:07 PM
Guy, I'm intrigued by your idea! Is this honestly successful and are you laying this on s slope of any degree, and driving on it?! Thanks in advance...
Shar - 6-Mar-17 @ 6:22 PM
jmc - Your Question:
Is there a drainage standard for how long water should sit (puddle) on a Gravel driveway ? If it remains too long presumably it could freeze in winter and break up the sub base or cause a slipping hazard to visitors leaving one liable under the Occupiers Liability Act.

Our Response:
No there doesn't seem to be anything this specific laid down in any of the building regulations (but you might want to ask your local building regs officer for clarification). The government guidance says
"when paving is completed watershould soak easily into the surface of the driveway. If a hosepipe is turned onto the surface for 1 or 2 minutes there should be no puddles and the water should soak straight in without flowing over the surface more than 200 to 300mm 18 Guidance on paving front gardens.
As a rule of thumb a pipe will be required if it takes a water filled 300mm by 300mm by 300mm pit more than 11 hours to empty"
DrivewayExpert - 22-Nov-16 @ 2:20 PM
Is there a drainage standard for how long water should sit (puddle) on a Gravel driveway ? If it remains too long presumably it could freeze in winter and break up the sub base or cause a slipping hazard to visitors leaving one liable under the Occupiers Liability Act .
jmc - 22-Nov-16 @ 8:52 AM
I found bedding a 5 cm Plastic mesh used for fencing (comes in a roll 2 metre wide) into sharp sand and laying 20 mm angular gravel over 100% successful. there is virtually no movement on an 1 in 10 incline. The plastic mesh is incredibly strong and costs around £2 per sq metre. This effectiveinvisible answer to covering concrete/ flagstonesis affordable and I actually feel surprised that simply nobody has come up with this cheap answer to thousands of posts on the web.
guy - 26-Sep-16 @ 4:31 PM
I have made a car parking space using hardcore and then flint top stones but there is a small slope to the parking area before it levels off and the top stones keep moving and forming into a rut. I have tried the plastic hexagonal mats & some steel grid to keep the stones in place but it has not solved the problem. I wonder if the top stones are too deep? many thanks, Joan
Joan - 17-Oct-15 @ 12:24 PM
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