Flashing Repair Services in San Luis Obispo

Flashing is the metal that seals the joints in a roof — where it meets a wall, a chimney, a skylight, or another roof plane. It is a small part of the roof and the cause of a large share of leaks.

Our network connects San Luis Obispo homeowners with roofers who repair flashing properly, rather than burying a failed detail under a bead of sealant.

Where Flashing Is Used

1. Valley Flashing: in the trough where two roof planes meet, carrying a concentrated volume of water.
2. Step Flashing: the overlapping pieces where a sloping roof meets a vertical wall.
3. Chimney Flashing: base, step, and counter-flashing around a chimney — one of the most leak-prone details on any roof.
4. Skylight Flashing: the kit around a skylight curb.
5. Drip Edge: along eaves and rakes, directing runoff into the gutter rather than behind it.
6. Vent and Pipe Flashing: around plumbing vents and other penetrations.

Why Flashing Fails

Age and movement account for most of it. Metal expands and contracts at a different rate from the roof covering and the wall it seals against, and decades of that movement work fasteners loose and open joints.

Bad installation accounts for much of the rest. The most common shortcut is a continuous strip of flashing where step flashing was required, sealed with caulk. It works until the caulk fails, which it always does, and then water runs behind the wall covering where nobody sees it until the framing is wet.

Sealant Is Not a Repair

Caulk has a place in roofing as a supplement to a correctly formed metal detail. It is not a substitute for one. Any repair whose entire mechanism is a bead of sealant across a joint should be treated as temporary, because exposed sealant on a sun-facing roof will crack within a few seasons.

A proper flashing repair means lifting the surrounding covering, forming or replacing the metal so that each piece laps the one below it, and re-laying the covering over the top.

Signs Your Flashing Has Failed

• Water stains on a ceiling or wall next to a chimney, skylight, or where a roof meets a wall
• Rust streaking on the flashing or on the wall below it
• Visible gaps, lifted edges, or flashing pulling away from the wall
• Cracked, shrunken, or missing sealant along a flashing line
• Damp in an upstairs room that only appears with wind-driven rain from one direction

Material Choices

Galvanised steel is the common default. Aluminium is lighter and will not rust but should not contact masonry directly. Copper lasts longest and is the usual choice on historic properties and slate roofs. Near the coast, corrosion resistance matters more than cost — galvanised steel that would last decades inland can fail much sooner in salt air.