Large, flat piece of wood (Darland, Medway ME5)

Looking for a long, thinnish piece of wood. Ideally 75cm long, by 60cm wide by 1cm thick or thereabouts. If it''s a bit shorter, a bit thicker or a bit squarer, that could work too.

The local recidivist vandals (juvenile foxes, not people) have made a large tear in a plastic greenhouse. Need something fairly sturdy - that they can't rip or squeeze through, or push aside - to stop them breaking in.

Thanks in advance.
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