How long does roof felt last under tiles?
Why the underlayment matters more on tile
Tile is not watertight on its own. Wind-driven rain gets under the tiles and runs down the underlayment to the eaves. On a tile roof the underlayment is the real waterproofing layer, and it sits in a hot space under the tiles where heat and moisture cycle every day.
What shortens its life
- Heat under dark tiles in full sun.
- Older organic felt rather than modern high-temperature membranes.
- Broken or slipped tiles that let sun and rain reach the felt.
- Debris dams that trap water above the underlayment.
- Foot traffic that cracks tiles and punctures felt.
Signs it is failing
- Leaks during heavy rain with no broken tiles visible.
- Stains on the attic deck in lines below tile courses.
- Brittle, crumbling felt visible at the eaves or under a lifted tile.
The lift-and-relay repair
Crews remove and stack the tiles, replace the underlayment and battens if needed, renew flashings, and relay the tiles, swapping in replacements for any broken ones. It usually costs less than a full tile replacement. Matching older tile can be the hardest part, so save salvaged pieces.
Choosing a longer-lasting underlayment
Modern high-temperature self-adhered and synthetic tile underlayments are designed for that hot environment and are worth discussing on a re-underlayment. Tile roofs are uncommon in North Georgia, so look for a contractor with real tile experience. See synthetic underlayment vs felt and common causes of roof leaks.