generally nothing and that means cement paths within a meter i always worked on a 2 meter margin. with termites you can't be too carefull when protecting your home and yes steel certainly makes their job a lot harder but they are resourceful little critters, and if there is a crack in a cement footing or in a weld they can find their way through these flaws and into you home (sorry mm you still need to be a little vigilant but yes i support all steel construction of homes in our climate).

you need to create a dry zone around the house as they like the soil moist so at best have a loose gravel type covering to keep weeds at bay fro the first meter then a cement or whatever path for the next meter then gardens.

len

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yes a trick i learnt form one of those real pest controllers, and also seen it many years ago mentioned on tv about home owner having paths and gardens right up close to the house. so if you have a 1 meter dry zone covered with stone mulch then a 1 meter path there is your 2 meters.

and those cracks in the brick work can be used by termites to gain access to your house, big trouble is the foundations in those active soils isn't good enough in the first place, so there will be cracks there that you can't see that termites can use.

len