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In a word 'no', neither will a thick plastic membrane before you ask. What you need is a few bricks mortared together, otherwise known as a wall... If it is retaining the raised bed nobody will be able to see how shit (or good) your brickwork is. Brick is cheaper and better than sleepers, which also rot. A gap of 1cm to the decking is plenty.
ColinTheBald
@Polygon
I'm going to need to retain some beds off the side of the deck I'm building at some point, the beds will be more or less level with the deck, so O need to maintain an air-gap so the frame doesn't rot.
Do we think these mesh panels, lined with weed membrane and spaced off the frame would be up to the job? I'm struggling to find examples of this done elsewhere, possible because it's a massive ballache.