In the situation given above would it be better to build on the boundary or to allow the gap?
If building on the boundary I suspect if the neighbours path is higher so it finishes above ground level of our garage wall having all that water run off flow onto the wall isn't a good thing? Would there be a barrier that can be placed on the outside of the garage wall to not allow the water to permeate through and how deep would it need to go to protect area under slab?
I don't suppose the neighbour has an obligation to ensure this water run off of theirs should go to stormwater drains?
If building off the boundary would this be the better option? Once again would the same barrier used in the above scenario be applicable here or is there a better alternative. Or would concreting that gap with a spoon drain be better? I realise even in doing this the gap between this and where it meets neighbours path would be small. So hopefully the water that gets through here is negligible?
Shouldn't this all be part of builders design as standard. I mean they account for creating the correct slab dependent on soil type but ignoring this part seems negligent if not defeating the purpose of the exercise because they leave a weakness that you really can't do anything about after being built. Unlike the concrete apron around the house you can build afterwards.
TIA all