Concrete and Clay Tile Roof Systems

Primary water-control layer over the deck, which may be felt-based, self-adhered, or part of a longer-life assembly depending on the tile system.

Tile sheds most weather, but it is not the waterproof layer by itself. Once underlayment gets brittle, punctured, or poorly lapped, leak risk rises fast.

Manufacturer minimums can be more conservative than basic code minimums, especially on premium clay profiles or longer-life roof builds.

Leaks that look like broken-tile problems often trace back to aged underlayment that has been exposed by normal tile movement or past patching.

The drainage and anchorage path below the field tile, whether the roof is installed direct to deck or over battens and possibly counter-battens.

This choice affects runoff, drying, uplift resistance, and even how repair work is performed later.

Some assemblies are direct to deck, while steeper slopes or moisture-sensitive conditions can justify battens or drainage-positive batten systems.

Treating every tile roof as if it shares the same batten logic leads to poor anchorage, blocked drainage paths, or incorrect repair methods.

Nails, screws, clips, adhesives, or combined attachment selected by profile, exposure, roof height, and edge zone requirements.

Attachment controls uplift resistance and keeps tile stable through movement and service work.

Perimeter, rake, and eave zones often need tighter attachment patterns than the field, and approved adhesive systems have to follow their specific reports.

Slipped tile, cracked nibs, or repeat repairs often point to attachment patterns that do not match the actual assembly.

Closure and trim strategy at peaks and hips, sometimes paired with venting and accessory nailers or backers.

These exposed joints need both weather control and secure trim support.

Mortar-set and dry or adhesive-set approaches behave differently and depend on the accessory system chosen for the roof.

Loose trim, open laps, and failed mortar joints often show up here before owners notice problems lower on the roof.

Starter-course support and closure pieces at the eave that shape the first course, manage drainage, and block pests.

The eave controls how water exits the assembly and whether the first course is supported correctly.

Profile shape, starter geometry, and gutter conditions change the correct closure shape and overhang logic.

Missing or incorrect closures can invite birds, trap debris, or let water run back toward the roof edge.

Corrosion-resistant metal channels that carry concentrated runoff where roof planes meet.

Valleys handle some of the highest water volume on the entire roof.

Gauge, width, splash control, and lap detailing change with runoff volume, climate, and profile geometry.

Many older tile roofs become replacement candidates when valley metal and surrounding underlayment have simply aged out together.

Step, apron, back-pan, curb, and penetration flashings integrated with the underlayment and tile cut pattern.

These interfaces bridge rigid tile geometry with moving penetrations and wall transitions.

Concrete and clay share core flashing logic, but accessory fit, clearances, and tile-cut geometry vary by profile.

Recurring leaks around skylights, vents, and sidewalls are often layered flashing problems rather than failures of the field tile itself.

How the tile system turns runoff into gutters or off-sheet drainage at the perimeter.

Tile runoff is heavy at edges, and poor starter geometry can miss the gutter or overload one section of the fascia.

Gutter presence, fascia condition, starter lift, and bird-stop selection all change the handoff at the edge.

Overflow, fascia staining, and edge rot often start where tile runoff and gutter geometry are out of sync.