Ok sounds very difficult, water is probably ponding against the retaining wall as you say.
Good luck

Then a cut off drain is probably not going to be as effective as a standard agi drain and even then may not work if there is no flow onto…

Depending on the natural slope of the land the drain should be on the high side to cut off the natural flow onto the block.
Maybe you should get the soil…

No it's basically an agi drain but with builders plastic on one side of the trench(the side you are trying to protect).
One thing about agi drains and cut off drains…

Legendary
A sand pad won't work and it will make the drainage worse. All you are doing is creating a pool underneath your house.Water flows across the top of the natural…

Do you have any photos during construction or does the building inspector have photos ?

The paving complies with AS2870 so they question can be asked of the builder did they provide adequate drainage by grading the soil way from the building as required in…

Can you prove the slab had already heaved before you bought it ?
Have you got a case against him ?

I know some engineers who might consider this type of footings (below) and others who would agree with the engineer who
designed your footing so might be worth a second opinion…

And why was it a "P" site ?

Hi ReneeN
What did the soil test report say ?

Piers should have been inspected prior to the slab construction.

Is it lifting or dropping and pulling away laterally ?

Maybe try talking to a resin injection company like Mainmark. They maybe able to lift it back to some degree and it might be cheaper than redoing the whole path…

I would prefer to install engineer designed piers than a root barrier. Root barriers are often not deep or wide enough to be effective
long term. If your neighbour does cut…

Can you post some photos and the design?

Probably a question for an experienced structural engineer specialising in this area. I would imagine there is research information available as well. Swinburne's advanced materials laboratory is probably a place…

Hi alex79
In general I like what your saying especially the first part about grading the site away from the footings.
This alone would significantly reduce the slab heave risk in…