Two questions really: Our semi (c.1962) has a concrete slab outside the front door, approx 2m by 1.5m. I feel I ought to replace it ...
(1) Not only is it very grotty by now, but it has sunk by about 3.5cm, away from under the front step. (If you see what I mean: the front step is of course a big concrete block which presumably is built into the walls; you step down on to the concrete slab; the slab was originally laid flush up to, and under the front edge of, the step; there's now a
3.5cm gap between the top of te lsab and the bottom of the step.) Question: should I be worried that the slab has sunk by such a depth over the years?(2) Question: If I just break up the slab in situ, and possibly remove an inch or two of the rubble, can I save on new concrete by just using it as (rather deep) hardcore?
Cheers - (and thanks for all the inestimable advice gleaned by us lurkers!) John