The industry standard, with 20 mm thick clear wood floor, 10 mm beading, and H4 treated bearers. TanE treated to ensure it lasts.
Tanalise Enviro-friendly treated: The active ingredient in TanE is copper azole (up to 97%) with tubeconazole, a fungicide (up to about 3%). Essentially it gets the anti-fungal anti-mould copper into the wood using water rather than a white spirit. When the woodware is initially treated, it is a light green colour, and weathers to a light greenish-brown or a light brown. So by the time most people get it, it will not have the bright green colour characteristic of copper treated wood.