Drive the tile neighborhoods of San Rafael and southern Marin — Peacock Gap, Loch Lomond, the Dominican area — and the roofs look immortal. Many of the tiles genuinely are: clay and concrete tile carry lifespans of 50 to 100 years. But tile is a watershed, not a seal. Water gets past it in every storm, by design, and lands on the underlayment. That layer — the actual waterproofing — lives 20 to 30 years. Every tile roof is therefore two roofs on two clocks, and most owners only know about one of them.
How does water get under tile that looks perfect?
Wind drives rain uphill under tile laps; broken or slipped tiles open direct paths; and valleys and flashing lines concentrate everything into the same few seams. The underlayment catches all of it and drains it to the eaves. When that layer is young, the system is close to bulletproof. As it ages — embrittled by decades of heat cycles — it cracks at laps and fastener lines, and the roof begins leaking in ways that seem to come from nowhere, because from the street, nothing looks wrong.
What are the signs the underlayment is done?
- Leaks that appear in rain after a dry spell of years, with no visible tile damage
- Stains that migrate — the entry point is rarely above the stain
- Slipped tiles multiplying season after season (the battens and fixings sit in the failing layer)
- Debris and granules washing from under the tile line at the eaves
- The calendar: if the underlayment is past 25 years, it is on borrowed time regardless of symptoms
What is a lift-and-relay, and why not just re-tile?
A lift-and-relay keeps the immortal part and replaces the mortal part. The tile is carefully lifted and stacked, the failed underlayment is stripped, the deck is inspected and repaired, new high-grade underlayment (and modern battens and flashing) goes down, and the original tile is relaid — with breakage replaced from matching stock. Because the tile itself is the expensive material, reusing it is where the economics work. Our roof replacement process runs lift-and-relay the same way: written scope, photos at every layer, permit pulled.
The question to ask any roofer quoting tile work: “Are you quoting me a new roof, or a new waterproofing layer under my existing tile?” If they have not lifted a single tile to look, they are guessing.
Can underlayment be repaired in sections?
Sometimes — a single failed valley or one slope’s worth of damage can justify a sectional lift. But underlayment ages as a system; a roof whose south slope has failed is usually within a few years of the same story everywhere else. A sectional repair is a buying-time decision, and it should be priced and chosen as one, with eyes open. An honest inspection will show you the lifted-tile evidence either way.
What does lift-and-relay cost in Marin?
It is priced by roof size, pitch, tile type, and how much deck repair the strip reveals — which is why any number given without lifting tile is fiction. The honest framing: it costs meaningfully less than a full tile replacement (the tile is reused), and meaningfully more than a shingle re-roof of the same footprint. Our Marin roof cost guide lays out the published ranges for full replacement; your lift-and-relay number comes in writing after we have actually looked under your tile.
