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Yep wrap it on all 6 sides to prevent soil/fines being washed into the voids between the large pieces of aggregate.
Aggregate laid on soil will just sink in.
mespilus-
Interesting I hadn’t seen much (anything) about this in my fairly limited research online.
The soil that the type 1 is going on is already very compacted as I have dug down quite a lot from the original level of the garden.
In this photo the plan was for the 2/3s closest to the back wall to just have weed membrane then ~30mm gravel and flower beds whereas the 1/3 (closest to the bottom of the photo) will have compacted type 1 to bring up the level before being covered in membrane and gravel
ghostface
When you say wrap it, do you mean above and below they type 1?
We were going to put a weed membrane on top of the type 1 and beneath the gravel