ok so today we were checking out floorboards and the lady at boral said the following regarding secret nailing...
14mm max for 180 boards
19mm max for 130 boards
then today i went somewhere else where they had 240mm x 22mm and the guy there said you can secret nail that no problems. said the lady at boral was talking BS..
would like to get some professional opinions before pulling the trigger on some amazing 240mm x 22mm recycled ironbark floorboards...