The damp proof sheets are merely to stop the sand leaking out of the gaps at the ends.
Add another layer of wooden boards and keep filling.
The finished bed, about 4' high. This will be left for a week for the sand to settle. You'd be surprised how much the top surface sinks. I'll top it up next weekend before boring and filling the holes with the mix. More on this nearer the time.....I'm still undecided on what mix I will use.
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