What are intact stability criteria for timber deck cargo ship?

For timber deck cargo ship:

For ships loaded  with  timber  deck  cargoes  and  provided   that  the cargo  extends  longitudinally   between  superstructures   (where  there  is no  limiting  superstructure   at the after  end,  the timber  deck  cargo  should extend  at least to the after end of the aftermost  hatchway)  transversely for the full beam of ship after due allowance   for  a  rounded   gunwale   not  exceeding   4%  of  the  breadth   of  the  ship  and/or   securing  the supporting  uprights  and which  remains securely fixed at large angles of heel, the Administration   may apply the following   criteria .