The overview
How is a tile roof replaced?
The old tile and underlayment come off, the deck is fixed, new waterproofing goes down, and the tile goes back on last.
A tile roof replacement is a rebuild from the deck up. The new tile is the last thing installed, not the first. Under it are the roof deck (the wood sheets or boards), the underlayment (the waterproof layer over the deck) and the flashing (thin metal or membrane that seals the roof at edges, valleys and pipes).
The Florida installation manual from FRSA and the Tile Roofing Industry Alliance, the trade groups for Florida roofers and tile makers, calls tile a water shedding assembly. Tile sheds most of the water, and the layers underneath back it up. The manual says how well the whole system works depends on proper installation of every component. So the work under the tile matters as much as the tile you see.
A tile job usually goes in this order, according to the Journal of Light Construction: inspection, decisions by the owner, tear-off, deck repair, underlayment and flashing, then tile. The next section walks through each stage. This is general information about how a Florida tile replacement works. Your roof, your tile maker and your county may add steps.
If you are still weighing replacement against repair, start with tile roof cracking: repair or replace. For cost, see our tile roof cost guide. Coastline does tile roof repair and replacement, so the tile roofing page has more on what we handle.