Lab Exhaust Curbs and Added Equipment
In the Walnut district the Pasadena Bioscience Collaborative houses biotech startups, and roofs over lab space tend to carry more than an office roof does: exhaust fans, make-up air, ductwork and the stands that hold them. Each one is a penetration, and each curb corner is a place where a corner patch can open. When a tenant adds equipment, the new curb is sometimes set before anyone thinks about counterflashing, and the first rain finds the gap.
Tech offices near JPL along Lincoln Avenue can follow the same pattern, since equipment changes with the tenant while the roof stays put. We flash each new curb and pipe at the time it is set, photograph the detail, and rework pipe and penetration flashing where old boots have split. That keeps a quick flashing failure from becoming a wet ceiling.
Fire Zone Maps and Santa Ana Gusts
Pasadena maps its fire hazard severity zones through the Arroyo Seco and along the stretch west and north of the 210 freeway, so an owner in the northwest part of the city should check a parcel against the current map before a reroof, not after. In a Very High zone, replacing over half of an existing roof within one year brings a Class A requirement, and the vents must resist embers. Class A belongs to the whole assembly, so the deck and underlayment count as much as the membrane.
When the Eaton Fire started on January 7, 2025, near Altadena and Pasadena, JPL shut down and evacuated, reporting only minor wind damage and no structural harm. Wind finds loose edge metal, open flashings and unsecured equipment covers first, and forecasters before the fire expected gusts of 60 to 80 mph. After a wind event like that we walk the edges and curbs and document what wind damage has loosened.
Reroofing Above Working Kitchens and Shops
A reroof over a cafe or a distillery needs a plan for the exhaust before it needs a plan for the membrane. We coordinate when hoods and fans can be shut off, stage debris and materials so nothing passes over an open patio or entry, and seal each tie-in before the crew leaves, because a roof opened over a kitchen has no margin for an overnight shower.
On a roof crowded with equipment the cost drivers are usually the number of penetrations, the length of wall to be flashed, and how tight the access is, not the size of the field. An office building roof with a few units costs less to reflash than a roof crowded with lab fans. We count the openings during the walk and price from that count, which keeps the bid honest on both ends.
Winter Storms on North Lake Avenue
North Lake Avenue serves its neighborhood with dining, retail and a transit link to trails in the San Gabriel Mountains, and the mountains matter to the roofs. They add enough orographic rainfall that Pasadena collects about six inches more rain annually than downtown Los Angeles, which loads low-slope roofs and drains during winter storms. A scupper box packed with leaves or grit turns a normal storm into standing water against a wall.
We clear and re-form drains before the wet season, check the cricket behind each unit, and look at the sealant joint along every parapet cap. Owners with properties in the Arroyo Seco area or Lamanda Park can have those roofs walked during the same visit and receive reports in the same format.
Drainage checks should be made at each roof level, not only where a stain appeared indoors. A higher section can send water onto a lower roof that was never sized for the added flow. We check the outlet, overflow route, and the condition of the wall below each discharge. If a repair changes the slope or outlet height, we document the revised path so the next maintenance visit can confirm that water still leaves the roof cleanly.
Commercial Roofing Questions
Which roof membrane holds up near a restaurant exhaust fan?
One formulated for fats and oils. KEE is the usual choice within a few feet of a hood, and we pair it with sheet metal flashing on the curb and a containment tray under the discharge. The seams and flashings take the damage first, so those details get more care than the field of the roof does.
How do we protect the roof when a biotech tenant adds new rooftop equipment?
Ask for the curb to be flashed before the unit is set, not after. Every new duct, pipe or curb becomes an opening, and the mechanical crew and the roofer rarely arrive on the same day. We coordinate with the contractor, flash the penetration, and photograph it so the next inspection shows what was added and when.
Can a Lincoln Avenue cafe keep serving lunch during a reroof?
In most cases the dining room stays open, with the loud work scheduled away from peak hours. The harder constraint is the kitchen exhaust, which has to be shut off briefly when we work near the hood, so we agree a window with the kitchen manager ahead of time. Debris is staged away from entries and patios.
What changes if the building sits north or west of the 210 freeway?
The parcel may fall in a mapped fire hazard zone, and that turns a routine reroof into a code question. In a Very High zone the covering must be Class A across the assembly, with ember-resistant vents and gutter debris protection. We check the map first, then write the scope around what the zone requires.
Does extra winter rain near the mountains change how drains are built?
It raises the stakes on every drain. With about six inches more annual rain than downtown Los Angeles, a roof in Pasadena sees longer, heavier runs of water, so we set slope to lead cleanly to the drain, re-form scupper boxes, and leave overflow paths clear. A properly sized cricket behind each unit helps as well.
