Slab is varouis thicknes, from 4" to over 2 feet in other places.
Approximately 27 feet long by 13 feet wide. At one time the prvious
owner painted it, and its a mess, then the wife wanted to install
outdoor carpet over it, which I did, after leveling it off with sand.
It worked fine for about 5 years but its starting to get hollows here
and there after lots of heavy downpours. We have a hot tube setting on
it, and there is no over head shade. The slab got cracked when there
used to be a huge oak tree growing near it, and the roots created some
damages, but tree is long gone and history. So what my problem is, is
to make that back slab where he have the hot tub and outside patio
stuff which we use quite a lot most all year around a bit nicer.
Ripping up slab and pouring new concrete is not really an option. What
we had in mind were a few ideas as stated below.

1.Level off slab with sand and lay down pavers, and use mortar to
bonmd the last rows(s) in place so they do not move.
2. Level it off with pressure treated lumber 2 x 4 or 2 x 6, and
install 5/4" decking, which will raise height of slab up 4 or 6 inches
or so, which would eliminate one bottom step on the outside steps in
the back door, but create one step to get onto the deck at the
driveway, which is fine also.
3. Pour a skim coat of concrete (sand mix) to level it up and then
install carpet again......(not really keen on this concept sa carpet
gets mildewed and algae on it really quick in this region.

Any other ideas greatly appreciated.

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