Attachment Rows, Ballast and the Open Field
Farther from the edge, wind damage tells a different story depending on how the membrane is held down. A mechanically attached sheet flutters, and the evidence is rows of fasteners that have pulled through or backed out of the deck, with slack, stretched ripples running between them. A fully adhered sheet loses its bond in patches, and a ballasted roof shows bare areas where stone has migrated toward a corner or a low point and left the membrane unloaded.
Each condition asks for its own repair. We replace pulled fasteners with plates and screws suited to the deck underneath, reattach lifted areas with the adhesive the original system calls for, and redistribute or replace ballast only where the structure can carry it. The sheet might be a TPO membrane with welded laps or an older roof that will no longer accept a hot weld, and the repair follows whatever that particular sheet is able to take.
Santa Ana Gusts at the Foothill Edge
Ahead of the Eaton Fire in January 2025, forecasters called for Santa Ana gusts of 60 to 80 mph across a wide area and isolated gusts of 80 to 100 mph. That is the load edge metal, flashings and rooftop units face in the foothills before any flame arrives, and it applies to roofs in Altadena, just north of Pasadena, as much as to those at the edge of the San Gabriel Mountains.
Wind repair in a mapped Fire Hazard Severity Zone, such as the Arroyo Seco or upper Hastings Ranch, carries a code question as well. Where damage leads to a reroof that replaces more than half of an existing roof in a year, Very High zone requirements call for a Class A covering, and that rating is earned by the roof built up as a system, not by the top sheet alone. We count the area before the scope is final, and where fire or embers were part of the event, fire damage roof repair adds steps of its own.
Securing the Roof Before the Repair
When we reach a roof after a windstorm, the first job is to keep more of it from leaving. We collect loose metal and debris, pin peeled edges down with battens fastened into the deck, and close open seams well enough to keep rain out of the insulation. A torn edge left flapping keeps tearing, so even a stopgap has to be fixed into the substrate and not merely weighted. Our emergency roof repair crews do this at any hour and on any day of the year, holidays included.
The next visit is quieter. We take moisture readings where the membrane lifted, mark every affected area on a roof plan, and record each finding with a photograph so the permanent scope can be written without guessing. When driving rain rides in with the wind, the same photographs and moisture readings carry into storm damage repair, and they are the record an adjuster will want to see.
Edge Details Rebuilt to Last
The permanent repair after wind is where fit and finish show. We replace cleats that bent with heavier metal, hand-form new coping and counterflashing where a stock part will not meet the wall, and solder or seal the joints so they can move in the afternoon heat without opening. The reglet is cleaned out, and the counterflashing is set back into it with sealant intended for that joint, not smeared across the face. This overlaps with ordinary edge metal and coping work, and the standard is the same.
The same detail also fails by degrees through summer. A June day that has reached 113 F pulls sheet metal open, the cool nights draw it back, and a sealant joint that has been cycled that way for years has no reserve left when a gust arrives. We recommend a walk of the perimeter after any serious wind event and again before winter rain, and on shared buildings we coordinate with the flashing repair that often follows a wind loss.
Commercial Roofing Questions
How can I tell whether wind damage is limited to one corner or spread across the roof?
Look at the pattern, not just the tear. Damage that starts at one corner and thins out along an edge is usually a single detail that let go, while fasteners backed out in rows across the field point to an attachment problem everywhere. We walk the whole roof and mark each finding so the work addresses both the cause and the reach.
The roof looks fine from the sidewalk after a Santa Ana event. Is a roof walk still worth it?
Loose edge metal, lifted laps and unlatched panels rarely show from street level, and a small opening at a parapet cap will let in the first winter rain without any visible sign. A walk after the wind costs far less than a leak inside the building months later, and it gives you a dated record if a claim is needed.
Can a peeled edge be patched, or is the whole sheet suspect?
The condition of the membrane and deck beneath the peeled area settles that. If the sheet is sound, clean and still weldable, a repair at the edge with a rebuilt termination will hold. If the deck is wet or the sheet has gone brittle with age, we say so and price a larger repair next to it.
Do Pasadena's fire zone rules change how a wind repair is done?
Only for buildings inside a mapped Very High zone, and even then mostly through the half-roof threshold. A small repair in kind is treated differently from replacing a large share of the covering. We check the zone map and speak with the permit center before the scope is written, so you know what the work will trigger.
A tenant's rooftop unit blew loose. Who is responsible for the curb and flashing?
Your lease and your property manager's records answer who owns the equipment, and we leave that question to them. The curb, flashing and membrane around the unit are roof work, though, and we repair them to their original standard so the building is watertight whichever way the responsibility is divided.
