Phasing Around Students and Staff
The roof comes off one section at a time, and each section is closed in before the crew leaves for the day. We stage material and hoisting away from play yards and drop-off lanes, fence the work zone, and agree on the route a delivery truck takes while buses are moving. Where a torch is a poor fit for a building full of staff, we choose cold-applied or mechanically attached systems that do the same job with less smoke and less noise.
Every evening the new roof is tied into the old one with a temporary detail that sheds water, because forecasts in a short rain season can change by morning. This kind of occupied building reroofing works only when the schedule is written down and kept, and when someone on our side answers the facilities office the same day. The last day of a phase is spent on fit and finish: tooled sealant joints, straight terminations and a clean campus.
Curbs, Hatches and Classroom Units
Most classrooms are conditioned by a rooftop unit, and the unit sits on a curb that is the most common leak path on a school roof after the wall flashings. We rebuild a leaking curb with hand-formed sheet metal counterflashing, a fresh base flashing lapped under the membrane and a sealant joint tooled so it sheds water rather than collects it.
Roof hatches and ladders get the same care, since a custodian will climb them for years and a bent hatch curb is a leak that opens each time the lid slams. Where a campus has many units, the whole group is best handled together as rooftop equipment curbs and supports, so the platforms, pipe supports and walk pads are rebuilt in one pass instead of one repair at a time.
Summer Heat, Reflectance Rules and Fire Zones
A classroom roof absorbs heat all day. Pasadena has recorded 113 F in June, and a late heat advisory in October 2023 pushed highs near 100 F, so a school membrane flexes through hard thermal cycles well past the end of summer. Dark, aged membranes crack at laps and at the edge metal first. Under the 2025 California Energy Code, a new low-slope school roof has to reach 0.63 aged reflectance and 0.75 emittance, or an SRI of 75, and the same floor applies to an alteration larger than half the roof or 2,000 square feet, whichever number is lower. A cool roof installation built to that rule also keeps the rooms below easier to cool.
Campuses near the foothills carry a second duty. Pasadena's mapped Fire Hazard Severity Zones run through the Arroyo Seco and the area west and north of the 210 freeway, and after the Eaton Fire destroyed 9,419 structures, districts there have good reason to settle Class A assemblies, ember-resistant vents and gutter protection before a reroof is scoped.
Condition Reports a Facilities Office Can Budget From
A district cannot replace all its roofs in one year, so the useful document is a ranked list. Our written reports cover each roof on a campus with photographs, seam and flashing findings, and a candid account of which areas are wet, which are merely worn and which can still be repaired. From that list a facilities office can place the failing roofs in the next summer window and spread the rest across several years.
Between windows, a spring and fall visit to clear drains and reseat loose counterflashing keeps a leak from becoming a lost classroom. A roof condition report feeds straight into roof capital planning, and the same findings support the conversations that school districts have with their boards and insurers. In Alhambra and Azusa, where the unified districts employ about 2,000 and 1,250 people, a ranked list does the same job. The same method suits college and university roofs. A college and university roof follows a different academic calendar, yet the same phased inspection record helps facilities teams set work windows.
Commercial Roofing Questions
How much of a school roof can be replaced during one summer break?
A good deal, provided the scope is cut into wings and the order of the wings is settled in the winter before. Material has to be ordered early, permits pulled and the staging areas agreed with the site office. A small campus may finish in one break, while a larger one is phased across two or three, worst roofs first.
Do students and staff have to stay out of certain areas while you work?
Yes, a few, and we mark them before the first day. The areas are the ground beneath the active section, the hoisting and delivery routes, and any entry that sits under the work. Classrooms below the roof stay in use unless the noise is a problem, and we can schedule the loudest tasks, such as fastening and tear-off, for the hours when the building is quietest.
What happens when a classroom roof starts leaking in the middle of the school year?
Call us when water enters a classroom. We stop the leak, mark any wet insulation, then document what failed and price a permanent repair that fits the next school break.
Do the cool roof energy rules apply if only part of a building is reroofed?
They can. The rule reaches any alteration beyond half the roof or 2,000 square feet, whichever number is lower, while a small patch stays outside it. We measure the planned area against both thresholds before bid day so the district knows whether the new membrane has to meet the reflectance and emittance values, and we can price both ways.
Can an aging school roof be coated instead of torn off?
Sometimes, and the test is the insulation. A coating works over a membrane whose seams are sound and whose insulation is still dry, which an infrared moisture survey can show without opening the roof. If water has spread through the insulation, a coating only hides it, and a recover or replacement is the right answer.
