Storm & Flood Damage Recovery in Naples, FL

Fill elevation is usually the answer. Lots here were built up at different times and to different standards, and a foot of difference decides where a sheet goes. Construction type rarely explains it, because most of the older stock is the same block on the same sand. A survey of finished floor elevations against the crown of the street tells you which house is the low point, and that is the house that keeps taking water.

Yes. Salt does not evaporate with the water; it stays in the block and the finishes and keeps drawing moisture back long after the meter says the assembly is dry. Rinsing and testing affected surfaces is part of the job, and materials that held salt water for any length of time usually come out rather than get dried. Treating a surge event as a large rain event is the most common way this goes wrong.

Probably, because tile hides more than it shows. Set over a slab, it lets water pass at the grout and travel under the field, and the surface can look untouched while the setting bed and the wall plates are wet. A meter reading at the slab and in the bottom course of block gives an honest answer. If those read dry, the tile can stay; if they do not, opening a small area early avoids opening a large one later.