Exhaust Curbs and Sheet Metal Over the Restaurant District
A restaurant roof carries equipment that a plain office roof does not: exhaust fans, grease traps at the fan housings and gas lines that wander across the deck. Grease softens some membranes and clings to any seam it can reach, and the curbs around the fans take the worst of it. We check each curb for open corner laps, a failed sealant joint where the fan housing meets the curb, and a deck that has gone soft underneath. A corner patch that is wrapped and fully lapped holds. One that is only smeared with mastic reopens within a season.
Where a fan sits on a flat roof with no slope behind it, a cricket carries water around the curb instead of letting it pool on the uphill side. Our restaurant roofing repairs include these sheet metal details, soldered or welded at the corners, along with cleaning and re-forming the scupper box wherever a roof drains over a wall.
Reroofing a Busy Frontage in Stages
A dealership cannot close its lot for a week, and a restaurant cannot lose a lunch service because a crew is loading tar overhead. We stage a reroof in sections, with the tear-off and the new membrane tied in before the crew leaves each day, so a sudden rain does not find an open edge. Material is lifted and set away from entrances and delivery times, and noisy work is planned around the hours when the building is busiest. The owner knows in writing which part of the roof is open on which day.
The system chosen depends on the deck, the equipment and how long the owner expects to hold the building. A TPO membrane over new insulation and cover board suits many flat roofs, while a building with many penetrations may do better with a fully adhered PVC or a coating over a sound existing membrane. The survey decides, not a catalog.
Pasadena Heat Records and the Cool Roof Rule
Pasadena’s climate record reached 113 F in June; a two-day heat advisory in October 2023 brought highs near 100 F. On Alhambra roofs, long sunny afternoons warm dark surfaces, then cooler nights draw sheet metal and membrane back. That cycle works on every lap, every termination bar and every sealant joint, and it ages a membrane faster than winter rain ever does.
California's 2025 Energy Code sets a floor for low-slope nonresidential roofs: a reflectance of 0.63 once the surface has aged, paired with an emittance of 0.75, with an SRI of 75 accepted as the alternate route. It reaches a brand-new roof, and so does any alteration that passes the halfway mark or 2,000 square feet of roof, whichever comes first. A modest reroof on a small building can cross that line. Our cool roof installation work starts with measuring the area, so the owner knows which side of the threshold the project falls on before signing.
Rounds for Healthcare, School and Warehouse-Club Roofs
Alhambra's major employers include AHMC Healthcare, Alhambra Unified School District and Costco, and a healthcare building, a school and a warehouse club ask very different things of a roof. A clinical building has equipment that cannot go down for a leak and a roof that has to be opened and closed quickly. A school roof is worked on in summer, when the buildings are empty and deadlines are fixed. A big-box roof has a wide field, many penetrations and drains that take the water from a very large catchment.
Our preventive maintenance visits are set to the building. We walk the edges, photograph each detail and record what moved since the last visit, so small repairs are done in minutes and a failing seam never becomes a ceiling replacement. Owners with property across the valley receive the same report format whether the building is in Alhambra, San Gabriel or Monterey Park, and larger groups can fold it into a multi-site roof program.
Commercial Roofing Questions
Why do roofs over dealerships and restaurants show leaks so far from the drain or fan that caused them?
Water follows the deck and the insulation, not the shortest path to the ceiling. It can travel several feet under a membrane before it finds a seam or a fastener to drip through. We trace the entry by opening the roof near the likely source and checking the flashing at curbs, drains and walls first, since those are the usual starting points.
What does a reroof cost on a small commercial building, and what moves the number?
Roof area and access set the base, then the number of penetrations, the condition of the deck and how much insulation must be replaced. A building with many curbs, exhaust fans and a high parapet costs more per square foot than a clean open field. A written scope after the survey lists each of those items so the proposals can be compared fairly.
Can a leaking restaurant roof be patched while kitchen exhaust keeps running?
Grease at the exhaust curb can weaken a patch unless the surface is cleaned first. We coordinate with the fan service trade when the outlet itself needs attention.
Does a partial reroof in Alhambra trigger the cool roof requirement?
It can. The state energy code is triggered by work on more than half the roof or more than 2,000 square feet, whichever is less, so a repair confined to one corner often falls below the line, while a larger section can cross it. We measure the work area before pricing and tell the owner whether a reflective membrane or coating will be required.
How soon after a heavy storm should a flat roof in this area be checked?
Within days, while the evidence is still wet. Pasadena sees most of its rain in a short winter season, with February the wettest month, so a clogged drain or an open coping joint is tested hard and quickly. A walk after the first real rain finds the sumps that did not clear and the seams that took water.
