Block Driveway - Aggregate / Grit sand

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This is a question for the professional driveway guys.

I've had the driveway dug out and stoned up but he dug a bit too much out so I need to put more on it to get to the finished level. I can either top the crusherun with a) more Crush and then 30mm grit sand or b) just use a thicker layer of grit sand than I intended.

Either way the cost per loose ton is the same, except that it will be easier to manually shift (and level) grit sand than the stone.

Plus if I go with option b) I can get 20 ton of grit sand in one drop as opposed to paying for a smaller amount of crush and sand to be dropped separately. And that could involve min qualtities per load.

Whichever route I go it's going to be thoroughly wacked down and the edges are all in place so nothing can move laterally.

From a structural point of view, is there any difference laying the Tobermore block paving on 30mm, 50mm or 70mm wacked grit sand as long as there's sufficient wacked hardcore underneath it ?
 
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25-50mm course sand is standard.

If this base is solid a bit more course sand will be fine.
It will compact a mm or 2 more finishd paving level wise but that's about it.
Other thing is you may get deeper ant depression as they can make deeper nests.
If you look after it and kill ants I can't see any probs.

I've constructed block paved roads on hardcore,base tarmac and 80mm blocks on sand 10mm to 100mm + thick to achieve the correct finish.
It's all about how solid the base is and retention of the edge.

You seem to have it all covered.
 

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