The January/ February issue of This Old House Magazine has a woman attaching a marble fireplace surround with construction adhesive for stone. I have also seen Tom Silva use some adhesive it to attach granite for a surround on Ask This old House.
My question is:
When do you use the construction adhesive and when do you use modifed thinset for the surround?
Is it based on the size of the stone or the fact that the pieces were so tight fitting that there will not be any grout space?