(If a stone does come loose ... For the replacement mortar, skip over packages of mortar mix and instead buy sand-topping mix. A call to the technical help line at Quikrete, a manufacturer ...

Q. I am installing flagstone and some paving brick on top of a concrete patio. A book I read suggests mixing sand, cement and hydrated lime in different proportions to make the mortar mix.

Mix a standard concrete with 1 part ... Now, using a gentle touch, lift the stones without disturbing the mortar bed. "Butter" the bottom of each stone with a thinner cement mixture and replace ...