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Metal Flashing Repair for Salt Air in San Diego, CA

Replacing corroded metal flashing, vent collars and drip edges on San Diego roofs close to the ocean, with fasteners and sealants chosen for salt exposure.

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  • Coastal and tile roofs
  • San Diego County
  • Roof repair and replacement

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Metal Flashing

Salt-Air Metal Flashing Repair: what it covers

Quick answer

Salt air corrodes metal flashing, drip edge and vent collars, and the corrosion usually starts at fasteners and cut edges before it shows on the face of the metal. Repair means replacing the affected pieces in a metal that resists the air, fixing them with compatible fasteners and sealing the joints so the salt cannot wick into the seam.

Salt-Air Metal Flashing Repair illustration for San Diego, CA

Salt air is the main driver of demand on the coast, and it is the reason a roof a few blocks from the water often needs flashing work years before a roof farther inland does. Salt is hygroscopic: it draws moisture into the metal and keeps the surface wet longer after a fog or a rain. Galvanised steel and plain aluminium fixed with the wrong screws are the first to show it.

Look for the corrosion at the places nobody paints. The underside of a drip edge, the head of a nail that has been set into a bent flashing and the cut edge where a coil was sheared all rust before the face does. A flashing that still looks bright from the ground may be pitting from behind.

Calls to (833) 751-2102 are answered at any hour, and the technician will ask where the metal is and whether it is a visible color or a hidden seam. That tells the crew which metal and which fixing to bring.

Service area
San Diego & San Diego County
Availability
Phones answered 24/7
Warning signs

Signs you need salt-air metal flashing repair

Metal flashing has sharp edges and corners that cut easily. Wear gloves when handling new or old pieces, and do not climb onto a roof with metal that is loose or bent. A fall from a sloped roof can cause serious injury, so the work is done from a proper ladder with the crew holding the top.

  • White or pale green crust at the head of nails through a metal flashing
  • A drip edge that has rusted through along its lower lip
  • Rust streaks running down the face of a roof from a corroded vent collar
  • Pinholes in a metal flashing that show light when held up to a window
  • A sealant joint that has turned chalky and pulled away from the metal
  • Stains on a fascia board directly under a metal edge
Our process

How our salt-air metal flashing repair visit works

  1. Identify the metal and the fixing

    The technician checks whether the flashing is galvanised steel, aluminium, copper or a painted coil, and notes which fasteners hold it. Mixed metals in contact are a common source of corrosion, so that check comes first.

  2. Remove the corroded pieces without tearing the roof

    Affected flashing is lifted gently, starting at the top of each run, so the membrane or shingles above are not damaged. Fasteners with heavy corrosion are removed, not left in place under a new piece.

  3. Fit compatible metal and fasteners

    The new piece is cut from a metal that suits the location, and fasteners are chosen to match it rather than to match the old screws. Each joint is lapped so water runs over it and no seam faces the wind.

  4. Seal the joints and review the work

    Sealant is applied only at the joints that need it, and a visual check is made from the ground and from the roof. The technician notes which pieces were replaced, so a later check knows what to look for.

Job stories

Typical jobs for salt-air metal flashing repair

Typical job
Illustration: A drip edge rusts through and soaks the fascia

A drip edge rusts through and soaks the fascia

What homeowners notice
A two-story house a short walk from the beach shows rust along the lower lip of the drip edge, and the fascia below has blistered paint with soft wood at one corner. The gutter bracket nearest the corner has begun to pull away.
What we do
The technician removes the corroded drip edge and fits a new piece in a metal chosen for the exposure, with fixings that match it. The soft fascia is cut back to sound wood and replaced, the bracket is re-fixed into a solid backing and the trim is primed on every face.
What to expect
The edge is dry on the next check, the gutter holds its line, and the owner is given a list of the coastal checks to make each year.

3-4 hours typical visit

How does salt air attack metal flashing?

Salt in the air settles on metal and holds moisture, so the surface stays wet longer than it would inland. Where two metals meet or where a cut edge is exposed, the salt drives a reaction that eats the weaker metal first.

Galvanised coating protects steel until it is scratched or cut, and the cut edge of a coil is the first place salt reaches. A nail that has been driven through a flashing without a sealing washer also gives moisture a route to the metal under the head.

Aluminium resists the air better than plain steel, but it is attacked by salt in contact with other metals and by alkaline mortar. Those contacts are checked on every flashing repair, because the wrong pairing can rot a new piece within a few years.

Which metals and fasteners are used on a coastal roof?

The choice depends on the metal already on the roof, the exposure and the way the piece is fixed. The aim is a metal and fastener pair that will not set up a reaction with each other.

Fasteners are matched to the flashing, and the head is set so the washer seals against the metal without crushing the lap. Where a metal is painted, the paint is kept intact at the cut edge with a touch-up on site, so the exposed edge is not left bare.

The technician explains the choice before the work starts. A customer who wants the old metal reproduced exactly can be told why a different metal may last longer in the same spot.

How often should coastal flashing be checked?

Once a year is a practical rhythm for a roof close to the water, and after every heavy rain or long fog season. The check looks for rust, lifted laps and sealant that has pulled away.

A check from the ground will catch the worst corrosion. A closer look from the roof, at the vents and the lower edge, catches the faults that are not yet visible. The technician records what was seen, so the next check can compare.

Rinsing the lower roof edge and the gutters with fresh water after a long dry spell is a simple habit that reduces the salt crust that builds up. It does not replace repair, but it slows the corrosion that is already under way.

Why not paint the flashing instead?

Paint slows corrosion on sound metal but it does not stop it on metal that has already pitted or rusted through. On a flashing that is failing, paint hides the fault until the water comes through.

A coating can be used to protect a new piece or to seal a cut edge, and that is a sensible use of it. Painting an old piece that is already corroded is a cosmetic fix that delays the replacement by a season and then fails more quickly.

The technician will say plainly when a flashing is sound enough to protect and when it has to be replaced, so the decision is made on the metal rather than on the appearance.

Options

Types and options for salt-air metal flashing repair

Drip edge and eave metal

The lower edge of the roof is often the first metal to go, because it is closest to the spray and is least likely to be painted. Replacement is a quick job but needs care at the corners.

Vent and pipe collars

Metal collars around vents and pipes rust from the base upward. They are replaced as a unit, with the flashing lapped under the shingles or membrane above.

Step and wall flashing

Metal that runs up a wall or steps down a roof slope. The work is slower because each step has to be lapped, but it is the job that stops water entering a wall.

San Diego County

Why salt-air metal flashing repair is different in San Diego County

Pacific Beach is an oceanfront neighborhood north of Mission Bay, and its beachside blocks are where salt and sun exposure show most clearly on a roof.

Ocean Beach sits at the mouth of the San Diego River, so its roofs take both the sea air and the valley's weather, and flashing there is checked with both in mind.

La Jolla is a coastal community with cliffs and coves north of downtown, and the roofs nearest the cliff edge are inspected for metal that salt has reached first.

Skip the guesswork. Call for a straight answer.

Tell us what's happening and we'll tell you honestly whether it's a quick fix, and what salt-air metal flashing repair should cost.

Call (833) 751-2102Get a quote
Where we work

Salt-Air Metal Flashing Repair across San Diego County

Not sure if you're covered? Check your ZIP code.

Related

Fascia and Eave Repair

Replacing soft fascia, soffit and eave trim, and re-fixing the edge of the roof so the gutter, the covering and the vents work together.

Parapet and Clay Coping Repair

Re-sealing parapet walls, re-setting clay coping and checking the flashing where a flat or low roof meets a raised wall on older San Diego buildings.

Skylight and Roof Window Repair

Re-sealing, re-flashing or replacing skylights and roof windows, with the kerb, the flashing and the ceiling below checked for water that has already entered.

Rain Leak Diagnosis

Tracing a roof leak back from the ceiling stain to the place water enters, with photographs and moisture readings kept for the repair and any claim.

Guides

Read before you book

A Checklist for a Roof Near the Water in San Diego

Salt air is the main driver of roof work on the coast of San Diego, as the fact sheet records, and it works on the roof through the metal, the trim and the fixings before it shows on the covering.

FAQ

Salt-Air Metal Flashing Repair FAQs

How long does flashing last near the ocean?

It depends on the metal, the fixing and how far the roof is from the surf. A roof a few blocks inland can outlast one at the water's edge by years. The technician will tell you what the existing metal shows, not promise a number.

Should the old rusted flashing be painted over?

Only if the metal is sound and the rust is surface rust. A piece that has pitted or rusted through should be replaced, because paint does not reach the holes and the water finds them.

Can I rinse the roof to remove salt?

Rinsing the gutters and the lower roof edge with fresh water helps, but it does not repair damage that has already happened. Call (833) 751-2102 if you see rust on the flashing or a stain on the ceiling below it.

Why do some flashings rust from the back?

Salt and moisture settle on the underside and cut edges, which the face of the metal does not show. The technician checks the back of the piece and the fasteners before deciding it is sound.

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