Anyone that owns an older house in SA should really have a read of this guide written by the Department for Environment and Heritage.
It has some very informative text and illustrations in regards to salt damp, cracking, ventilation etc.
“One of the two most common sources of dampness in old buildings is rising damp – moisture that rises
up from the ground into the base of masonry walls. When this moisture contains high levels of dissolved
salts, the problems of rising damp are compounded by salt attack. The action of the two together is
commonly known in South Australia as salt damp.
This is perhaps the single most destructive force at work against old buildings in South Australia.”
It also has a routine maintenance guide that you can follow during the different seasons.