Is my build up for a driveway okay?

[Adsibob]

We are re-doing our driveway (to fit one car only), which is on a pitch of about 15 degrees, maybe slightly less, coming from the road down to the house. My builder has suggested a build up as follows:

 

• 50mm thick cobbestones
• 50mm sand and cement
• geotextile membrane to prevent weeds coming up
• 150mm machine compacted hardcore

 

Is this pretty standard or should I be asking for any changes?

[markc]

I would say that’s a pretty good buildup, cobble stones could be very slippery at 15 degrees tho

[Adsibob]

4 minutes ago, markc said:

I would say that’s a pretty good buildup, cobble stones could be very slippery at 15 degrees tho

You make a good point. What pavers/stones would you recommend? We want something in grey or a mixtures of shades of grey, that looks quite classical and a bit old worldy. hence why I thought Coblestones. 

[markc]

Really not sure what to suggest, maybe someone is doing faux cobblestone in concrete or something with a bit more grip.

[Adsibob]

The edges of the stones are tumbled and the surfaces are "natural/riven". Not sure whether that would be grippy or not. Oddly, they don't have a slip resistance rating. Was going to purchase them from www.rock-unique.com so have asked them the question.