Best hardcore size for a small 1 in 8 gradient ramp.

[epsilonGreedy]

I need to form a small ramp at my drive threshold. The dimentions are 18cm drop (the gradient) over a 1.5m horizontal distance, so call it a 1 in 8 slope. The width of the drive is 5m. The high end of the ramp butts up against a solid granite kerb and the low end of the threshold ramp merges into a hardcore private road.

 

The ramp will have a decorative top covering of angular 15mm hard chippings and about 35mm deep.

 

I cannot decide between ordering 2" clean limestone or graded MOT1 to form this ramp. I am leaning towards 2" clean in the hope that the top chipping layer will lock nicely into the larger 2" base.

Edited January 2, 2020 by epsilonGreedy

[Russell griffiths]

Type 1 and a whacker plate. 

Edited January 2, 2020 by Russell griffiths