Hi The steps to our house have taken a toll with harsh winter of last couple of years. I think what added to it is two heavy door mats which trapped water under them. Bricks were coming loose and so I removed bricks and fieldstones . I can see solid concrete block under that which is not damaged . Here are my questions -- 1) Some of the spots seem to have very strong mortar . Do I need to remove those too (will need a demo hammer) or only the loose crumbling ones 2) The fieldstones seem to be resting on a bed of sand. Is that something normal , and should I lay fieldstones like that ? 3) I can see two holes on two corners --might be just crumbling mortar but I am wondering if it can be something like weep holes ? 4) Can I use something other than fieldstones ? If so, what (with a similar thickness) 5) Should I use N type cement mortar or S type ?