rhowe-
The answer to that question is a simple 'no'. The answer to a permeable base for shingle is crushed concrete with a layer of sharp sand on top. The answer to planting between slabs is concrete and a layer of mortar under each slab and soil in between.
Any area of shingle will inevitably grow all the things you don't want. Leaves will decompose on it, fine soil will blow into it, it will soon become a 'wildflower' bed.
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Perhaps more so, it's not gonna be 1 big slab it'll be max 600mm wide strips with 50mm gaps, so the runoff from those steps will be concentrated in the remaining gaps.
Seems like grano is often used for artificial lawns so this is probably the way to go, especially as I already have a bulk bag sitting in the garden, possibly mixed in with some 20mm crushed stone.
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ColinTheBald
Polygon
Yeah but type 1 doesn't drain well.