Yes we have two 60 minute timber joist new ceiling lining systems:-

Fig 4.10.5 below uses 9mm SUPALUX® board with 80mm wide cover strips, the minimum joist size must be 130mm x 38mm at maximum 610 c/c, with minimum 19mm T&G flooring above.

Fig 4.10.6 below uses 12mm thick SUPALUX® board, the minimum joists size must be 150mm x 50mm at maximum 610mm c/c, with minimum 19mm thick T&G flooring above.