The Heraklith board - looks a bit like hard Golden Slice ... without the cheese ... or the oats, or... well anyway: wood grated and then squashed together. No unpleasant chemicals.
It is screwed to the battens through a special, and ridiculously expensive, plastic washer.
The individual Heraklith boards are cemented together.
The total effect - almost. There's a bit missing to the right of the window.
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