Message text written by "BP - \"Preservationists shouldn't be neat
freaks.\"  -- Mary D"
>The surface of the
pavers become the evaporation interface. The salts do not migrate into the
surrounding soil, most likely due to a Portland Cement based concrete
substrate
with Portland Cement based mortar around the pavers. At that point the
granite
may be the more porous material and be the one subject to damage by the
salt
crystals forming and expanding on and within the surface of the granite.<

I'm sitting here shaking my head over this one. Granite more porous than
Portland cement concrete? While I don't have numbers at my Sunday morning
fingertips, I'd bet that granite is both more dense and less permeable than
any but the highest strength/longest wet-cured concrete one can imagine.

As for soil porosity, I guess some of us in New England are too accustomed
to having moisture coming through slabs on grade and basement walls to
think of soil as being a really good way to dry anything out.

Mike E.