Waterproof liners are a great way to keep the moisture away from the flooring of wooden enclosures. Tables and vivariums can rot very quickly with exposure to substrates and it is much more cost effective to line the enclosure than replace the flooring.
This liner is 3x1.5m (9ft10"x4ft11") so will easily cover even larger enclosures.
It can be easily cut to the size needed with a sharp knife or scissors and then attached with either silicone, nails or staples.