Fire Damage Roof Repair in Daly City, CA

After a fire, the roof has two injuries: what the heat did and what the water did. On a commercial building in Daly City, CA, we start with safety, because a burned deck may not carry a person, and no one should walk the roof until a structural review says where it is sound. From the ground, a lift or a drone, we photograph the scorched membrane, the opened areas and the openings firefighters cut for ventilation. Once the roof is safe to reach, we cover open areas, close penetrations and protect the interior from rain. The permanent plan comes after the building is released by the fire authorities, and it begins with a deck inspection, not a patch. Interstate 280 and Highway 101 are listed among the city's transportation links, and a fire response closes streets around the building, so we confirm the access route and the staging space with the owner and the fire authorities before a crew or a lift arrives.

The next decision is how much of the roof the fire changed and what must come off.

Heat can weaken steel, char wood and crack concrete without leaving an obvious sign. A roof that looks intact may have lost strength at a joist bearing or along a section of deck. We coordinate with the owner's structural engineer, or recommend one, before crews load the roof. Until that opinion, we work from the ground or from a lift, stage materials away from damaged areas and mark off zones that are not to be walked. If an engineer asks for a probe or a core cut, we make the opening and then close it. Our emergency response runs around the clock, so a temporary cover can go on as soon as the site is released.

Fire damage varies across a roof. Directly above the fire, membrane may be melted or burned away and the insulation charred. Farther away, the sheet may be blistered, shrunken or discolored, and smoke may leave residue that affects adhesion. Some insulation boards, such as foam plastics, can melt and shrink, leaving voids under the membrane. We walk each section once it is safe, probe the membrane and record where it is sound, damaged or doubtful. Areas that appear intact but are close to the burn zone get a closer look, since heat can distort a seam or a flashing without burning it. The result is a damage map with three colors: remove, evaluate and keep.

Water used to fight a fire often does as much harm to a roof as the flames. Insulation can hold gallons of water, and trapped moisture rots wood decks and corrodes metal ones. Standing water can pond above areas the heat weakened, adding weight. We use an infrared moisture survey and probes to find wet areas, and we remove wet insulation back to dry material. At the San Francisco International Airport station, November through March brings 16.76 of the year's 19.64 inches and June through August only 0.18, so a fire in winter adds rain to the water problem and a roof left open in the wet months will keep soaking. The temporary cover is the first priority in the cool season.

Drains also need attention after a fire. Ash, charred debris and melted material can block outlets, and a clogged drain turns a weakened roof into a pond. We clear each outlet, flush the leader and set a screen so debris cannot wash back in. If the drain bodies or the leaders took heat damage, we flag them for plumbing review before closing the roof around them.

The rebuild follows the layers. The deck is repaired or replaced where the engineer requires it. Insulation is installed in the removed areas, with attention to fire ratings and thickness. Cover board and a new membrane follow, with flashings rebuilt at walls, curbs and penetrations. Where the fire spared part of the roof, the new work ties into the existing membrane with a welded or adhered lap, and the tie-in is detailed to be inspected later. If the fire affected most of the roof, a full replacement may be cleaner than a series of patches. Rooftop equipment that was damaged or removed gets new curbs and flashing.

Sequencing matters between trades. Interior demolition, mechanical replacement and roof work overlap in a fire rebuild, and each needs the roof closed at the right time. We agree on who owns the temporary dry-in, where materials are staged and when the permanent membrane can go on without being walked on by crews hauling out debris. A short call each morning with the general contractor and the restoration lead keeps the schedule honest, and a general contractor on site receives our marked plan of the temporary measures.

A rebuild after a fire commonly needs a permit and inspections. The Building Division reviews plans under Title 24, the local amendments to California's 2025 code took effect January 1, 2026, and an application deemed complete earlier can continue under the previous edition. The owner or restoration contractor tells us the permit status, and we price the work to match. For the claim, we provide dated photographs, the damage map, quantities and the sequence of work, which insurance and restoration teams can use. Our part in the claim is to describe the roof and the work.

Closeout: Document the rebuilt roof for the file

At completion we photograph each layer before it is covered, the finished seams and flashings and the tie-ins, and we mark them on the plan. The deck repairs, insulation and membrane are listed with their locations. The file helps the owner, the insurer and the next inspector understand what was replaced, what was kept and why each decision was made on that date. It also supports a maintenance plan that checks the new roof and the old roof where they meet. Buildings along Mission Street, Geneva Avenue or in South San Francisco receive the same record. After a fire, puncture repair may also be needed where firefighting cut openings or dropped tools.

Commercial Roofing Questions

When can the roof be repaired after a fire?

After the building is released and a structural opinion says where the deck is sound. A temporary cover can go on earlier from a safe position, so rain stays out in the meantime.

Does smoke damage a roof membrane?

Smoke residue can affect cleaning and bonding, and heat near the burn zone can distort seams and flashings. We test and clean the surface before any new membrane is attached to it, and we test a sample weld or adhesive bond on the cleaned area before committing to the full repair.

Can a partially burned roof be saved?

Sometimes. If the deck is sound and the insulation dry, the damaged section can be replaced and tied into the sound part. If the heat spread through the field, replacement of the whole roof may be more practical.

Who removes burned debris from the roof?

We remove roofing debris as part of our scope, and we coordinate with the restoration contractor for the rest. The roof is cleared of loose material before new work begins.

What do you provide for the insurer?

Photographs with dates, a damage map, quantities, a description of the repair and the sequence of work. We describe the roof and the work, and the carrier decides coverage.