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Posted: Fri Apr 02, 2010 1:47 pm
by LFTR
Hi all,
We have a tarmac driveway. To the side of this is a length of stoned area(approx 2'x20'). 2" of stones on top of 2" of hardcore and a membrane beneath.
Presumably we could not just take up the stones and tarmac over even if this part of the drive was hardly ever used for vehicles without the chance of the tarmac sinking?
cheers
Edited to add - looking at the faqs again I'm probably at least two inches short of hardcore?
Posted: Fri Apr 02, 2010 2:09 pm
by irishpaving
If this concrete is connected to the side of the tarmac then what you could do is dig out a small section and expose the side of the tarmac and the subase. Then you will see how the tarmac drive was formed and if you want to extend the tarmac you just continue with the existing. 
Posted: Fri Apr 02, 2010 2:21 pm
by LFTR
Thanks for the reply.
Dumb question! - dig out the from the stoned side to expose the concrete kerb and below?
thanks
Posted: Fri Apr 02, 2010 2:35 pm
by irishpaving
Is there is an existing kerb or edging at the edge of the tarmac. This will take a bit of work to dig out due to concrete.
So if you are to extend the tarmac you will need a min of 100mm type1/hardcore then min 50mm dense tarmac and a wearing course of min 25mm
Posted: Fri Apr 02, 2010 2:49 pm
by LFTR
Yes there is an existing kerb.
The stoned area sits between ours and next doors driveways, edgings either side. The stoned area is our responsibility so it looks like we are at least two inches short of hardcore.
thanks for the advice.
Posted: Fri Apr 02, 2010 3:19 pm
by Dave_L
If in any doubt excavate area and 100mm subase.
No point skimping as the tar will only sink/crack/fail in the furture.
Posted: Fri Apr 02, 2010 4:49 pm
by LFTR
Dave_L wrote:If in any doubt excavate area and 100mm subase.
No point skimping as the tar will only sink/crack/fail in the furture.
Cheers, I think that's what we will end up doing rather than renewing twice!