Posted: 04/11/2014 at 09:14
Block paving is laid on a 2-3 inch bed of sharp sand anyway, so laying on top is an option, however, does the current patio have a slope for drainage? Laying on top of concrete is all well and good, but drainage will be the issue.
I can't see a one inch base being a real problem, a sledge hammer would break it up easily. If it's a foot then yes you'll need a jack hammer.
The sharp sand base is usually compacted using a vibrating plate, which is the best way of ensuring a firm foundation, and you get very close to level by using it.
Lifting concrete slabs shouldn't be difficult you just need to get under the first one with a spade or bar. The foundation is probably sharp sand and cement, if it's concrete someone has gone over the top laying it. Might be a body underneath!
It depends on the finish you want, to do the best job you really need to get rid of the lot and start fresh.