My block paving on my driveway has sunk in areas ?

Question

How or what can I do to resolve this ?

Answer 1

Hi Toni Lou

Sounds like the ground has not been prepared properly before laying it should be compacted hardcore ( flattened with a flat whacker plate type of machine)
This is then covered with a minimum amount of sand which blocks are laid on & it should be sloped to slight angle to allow water to run off towards a drain
if the sand has been laid quite deep & there are pools of water this is also a common reason why the blocks sink as the sand gets washed away when blocks are driven on etc & the water (with sand in it ) splashes upwards
If you had it laid recently I would advise you to get the paviours back to resolve the problems

Answer 2

Was the base layer hard core compacted? Was the block paving then compacted after laying? What does the sub soil comprise of? (clay etc) How much of it has sunk? is it mostly where your car goes over it? The quick answer is to pick up the sunken blocks put in sand and then compact down. The long term answer is to pick it all up and relay it, sorry not what you want to hear.

Answer 3

Quick cure is to lift sunken pavings and fill in with sharp sand.
When weather permits it's best to re lay most of the driveway. It sounds as if there may be water seeping under the pavings, or the hard under surface has cracked.

The weight of the cars may be too much for the under surface, which might need to be hard cored now.

Answer 4

remove the area of paving and at least a metre around it dig to a depth of 300ml fill with hardcore screed the sand and relay the paving making sure to wacker the hardcore and finally brush kiln dried sand brush and wacker again

Answer 5

you need whats called a mud jacker. if they are just sunken and not broken they can inject gypsum under great pressure and raise them...look in yellow pages or ask around at area hardwares. i have seen it advertised at half the cost of new concrete. the trouble with picking them up and putting sand under them is that you will never get a good solid base back under them. 35 years in the masonry business

Answer 6

Sounds like a titanic job!!