The rated deck load is quoted for uniform load distributed globally. If the cargo is such that the point load exceed the rated load per sq.ft./sq.m. some form of dunnage/cribbing has to be used, or grillage constructed, to spread the load over the area required to stay within the allowed limit.
Here is cribbing laid out on deck of a Heavy Lift Vessel to spread the load evenly on the bottom of the cargo. (No problem with load factor on the HLV deck):
In this case the cribbing is in a "fish bone pattern".
Here is a more common way. This to ensure that the load is distributed on the frames of the cargo, not on the bottom plates:
This is from loading a jackup rig on HLV Black Marlin
The same basically apply in reverse when loading heavy cargo on deck of an OSV, Barge or whatever.
If you cannot spread the load on sufficient area, make sure point load gets on the frames.
PS> if there are wood cladding on deck, check if the rated load take this into consideration.
PPS>If you need to weld lashing pad eyes on the T- bars for the wood cladding, make sure they are full welded to the deck. (Sometimes found to be only tack welded)