How much hardcore?

[gretsch drummer]

Now then, I'm making a gravel parking area/patch so we can move 2 cars independently. The area I've dug out is 15m2 and I'm wanting 100mm of compacted hardcore then 25mm of top gravel:



How much hardcore in tonnes will I need to fill 15m2 to a compacted depth of 100mm? I'm getting different amounts from each person I've asked so far.

Cheers.

[bobtail4x4]

assuming limestone or similar, its 1500kg per m3

15m2 x0.1 to give 100mm is 1/10th of a tonne,

complete bks sorry

Edited by bobtail4x4 on Wednesday 12th August 09:16

[993AL]

3 tons

[Woody3]

As above, just over 3t.

15m2 x 0.1m = 1.5m3

There's 2.2t of MOT Type 1 to a m3.

So 1.5 x 2.2 = 3.3tonne.

[Tuvra]

Woody3 said:

As above, just over 3t.

15m2 x 0.1m = 1.5m3

There's 2.2t of MOT Type 1 to a m3.

So 1.5 x 2.2 = 3.3tonne.

Yeah this is what I would say. Not really sure how you can get different answers, its fairly straight forward and anyone dealing in this stuff should know.

[Bill]

bobtail4x4 said:

assuming limestone or similar, its 1500kg per m3

15m2 x0.1 to give 100mm is 1/10th of a tonne,

Er...




Quoted for posterity.

[grimmac]

bobtail4x4 said:

assuming limestone or similar, its 1500kg per m3

15m2 x0.1 to give 100mm is 1/10th of a tonne,

Someone needs a new calculator...

[bobtail4x4]

someone was tired

sorry bout that,

15m2 x 0.1 to give 100mm thick, =1.5m3 x say 1500kg per m3 approx 2.25tonnes

[yellowtang]

I would use some gravel grid, otherwise you will end up with loose gravel all over the surrounding Tarmac.

[gretsch drummer]

Cheers guys, so 3-4 tonne it is then. To keep the gravel from spilling over I concreted the edging stones a inch higher than the final level.

Just have to let my back recover from laying those 8' sleepers before shifting any hardcore.

[red_slr]

I think you will go OTT with 4 tbh.

[gretsch drummer]

Sound. Will see how far i get with 3 tonnes. Can always get another tonne bag dropped off if needed.

Cheapest per tonne(ish) bag I've found is £35. Not sure a tipper could get down the driveway to get loose stuff delivered.

[Camoradi]

If you are getting bulk bags delivered and the lorry can get alongside where you want it, the driver might be willing to suspend it over the area while you cut the bottom of the bags with a Stanley knife. I had 5 tonnes of top dressing dropped this way recently and it saved me a lot of work. I'm sure there are H&S rules against it, but the driver suggested it

[red_slr]

gretsch drummer said:

Sound. Will see how far i get with 3 tonnes. Can always get another tonne bag dropped off if needed.

Cheapest per tonne(ish) bag I've found is £35. Not sure a tipper could get down the driveway to get loose stuff delivered.

We charge £40/tonne so that's not a bad price assuming it includes the VAT and there is no delivery charge.
Just make sure its a good quality type 1 not some substitute material some places fob people off with.
You are going to have to barrow it in I suspect due to width of the drive.

[Spudler]

Bear in mind the bulk bags are about 800 not a ton.
2.5 will cover the area so your right to start with 3 bags.

[red_slr]

Again depends on supplier, ours are all 1000kg.
We are one of the few I admit!!

[gretsch drummer]

I've got a mone-bros a few miles away so will see how much their bags hold. I know they do good type 1 limestone.

Ps, I'm in north Leeds so if anyone knows of good aggregate sellers to try that'd be appreciated.

[JackReacher]

Out of interest what did you do with all the soil you excavated? I'm looking to do something similar but dont have a big enough garden to hide it away. Also, is 100mm of hardcore the recommended amount, I'll be using those grids as I have a very slight slope, so it's going to need excavating to about 150mm, that's a lot of soil!

[gretsch drummer]

Alot of it was grass which was dug up and used to fill the (stupidly large) borders the previous owner had put right around the back garden. But the rest was dumped round the side of the house ready for a skip with all the other bushes and trees we've chopped down.

100-150mm seems to be the amount of hardcore needed when reading guides online etc. A good website is www.pavingexpert.com

Edited by gretsch drummer on Thursday 13th August 11:05

[gretsch drummer]

Just booked to have 3tonne of 1.5" limestone loose delivered from Mone-Bros for £95, not bad.

Luckily their small tipper is 2.5m wide and the driveway is 2.7m wide, so that's saved me 6-8meters of barrowing.

Cheers for the help.