Just under 2yrs ago we had all our back landscaped, we have noticed that when walking on some of them they sound hollow & the flags are loose in some areas. We paid a lot of money for this project. Surely the flags should not be like this after 18mths?
I noticed after a couple of weeks, whenever it rained there was always 3 or 4 round marks on each flag that would take ages to dry out. Also a lot of the jointing has shrunk?
I can provide pictures but I don't know how?