so - the plan is :
1: Chisel the edgings out at the point where they meet the concrete leaving a 2" drop all around
2: Bring levels up on the extension and compact with Type 1 for the sub base (think I may need a capping layer first - any recommendation?)
3: Fill with material up to 32mm of the tarmac on those parts where no new edge is required (hope you understood that!)
4: I'm currently investigating whether to use aco ground guard mats for the last 32mm filled with 10mm gravel to bring it flush
or something else as I don't think resin bound will go onto Type1 ?
5: Use Resin bound gravel to bridge across the existing drive to the new bit (looking into some kind of matting to reinforce that bridge but haven't found a supplier yet)
Questions;
Do I need to do anything special when putting type 1 layers over the concrete haunching (which has a radius)- would I be better off squaring off the concrete using SBR add for adhesion and the type 1 next to it?
I have chosen charcoal small pavers to give new edging - these are fine where the new ground is as I will just bed into a mortar mix but there are sections where I need to follow the existing drive profile - again the existing edge will be chiselled out - but that presents a problem getting the new pavers in to the old edge position - the pavers are 125 deep - I will have 50mm from removing the old edging + 12mm to add to the new surface height once the RB is down - should I cut the concrete haunching down 100mm or reduce the paver profile / shape to suit sitting on top of the concrete profile ?