Grease and leaf litter reach a roof drain long before water does. On a roof over a restaurant row, a sump packed with both sheds a storm the wrong way: water backs up, spreads across the membrane and climbs the base of every wall and curb it meets. The Playhouse District runs across 32 downtown blocks in Pasadena, CA, and within a half mile sit 24,000 workers and over 45 restaurants, bars and cafes next to the national retailers. Commercial Roofers Pasadena repairs, replaces and maintains commercial roofs across the district, and we start where the water leaves the roof, at the drains and scuppers, because a roof that drains well forgives a good deal else.
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Commercial Roofing in the Playhouse District, Pasadena, CA
Sumps That Clog Above the Kitchens
A drain sump sits at the low point of a roof, which makes it the place where everything blown, spilled or shed on the roof ends up. Over kitchens that includes cooking residue carried from the exhaust stacks, and the mix hardens into a cake around the strainer. Once the strainer clogs, water stands beside the drain, and a membrane that stayed dry most of the year sits wet for days after every storm. Overflow scuppers are meant to relieve that, but a scupper box with a bent lip or a blocked throat does nothing at all.
In a city where February brings about 3.9 inches of rain, a drain neglected since summer meets its test all at once. We clean the sump, check that the flange is sealed to the membrane and look at the slope around the drain, because a low spot there holds water even when the strainer is clear. Rebuilding roof drains and scuppers and correcting ponding water with tapered insulation or a cricket are usually the same job.
Membrane Choice Near Exhaust Fans
Grease is hard on some membranes and mild on others. Certain sheets swell and soften where fan discharge settles, while PVC and KEE membranes are made to resist fats and oils and keep their welded seams intact in those zones. Where a restaurant roof is otherwise sound, a PVC or KEE section welded in around the fan can solve the problem without replacing everything. Protection pads and marked service paths matter too, because the technicians who clean the fans wear through a thin sheet faster than the weather does. Sheet metal collars and hoods around the stacks should be formed to the fan, soldered or sealed at the seams, and set so grease runs off them and not into the roof.
Older Offices and New Laboratory Loads
Arrowhead Pharmaceuticals leased 48,882 square feet in downtown Pasadena in the fourth quarter of 2025, an example of life-science tenants moving into older downtown office space. When a tenant like that fits out a floor, the work can send new equipment to the roof: exhaust fans, ductwork, dry coolers and the pipe runs that feed them. Each added support is another penetration through the roof of an older office building, and the weight has to land on structure, not on insulation.
We coordinate the roof side of that work with the tenant's mechanical contractor so curbs are flashed before the units are set, not cut in afterward. Where new equipment is going onto a membrane near the end of its service life, renewing that area first is far easier than lifting a unit again to chase a leak. Our work on rooftop equipment curbs and supports includes the framing, the flashing and the sheet metal that finishes them.
Old Roofs and What Lies Under the Top Layer
The Pasadena Playhouse in the Playhouse District, a Spanish Colonial Revival theater completed in 1925 with a 686-seat auditorium, shows the range of buildings in the district. A roof on a building that old can have been re-covered at some point, and the layers underneath can hold water that the surface does not show, so the first job is learning what is actually up there: how many layers sit over the deck, whether any of them is wet, and where old flashings were left behind a newer membrane.
An infrared moisture survey maps the wet areas without opening the roof, and a few core cuts show the layers and the deck. Those two steps turn a guess into a scope the owner can see before anyone prices a replacement, and they often shrink the area that has to come off.
Heat Spells Over Hot Kitchens
Pasadena has recorded a June high of 113 F, and a two-day advisory in October 2023 put highs near 100 F, so a flat roof here is hot for far more than a few summer weeks. Restaurant roofs take heat from below as well as above: kitchen exhaust warms the deck around the fans, and a membrane that is already working hard at the penetration moves more with every afternoon peak. Sealant joints and cured flashing sealants age faster in that exposure, and seams that were fine in spring can show a hairline gap by fall. A visit after the hottest weeks, followed by heat and UV damage repair where the sheet has chalked or shrunk, keeps small defects from opening in the first rain.
Scheduling Around Evening Crowds
Evenings are the busy hours in a district with a historic theater and dozens of restaurants, which suits a roofer, since the loud and dusty work belongs to the day. We stage material away from entrances, keep fumes and adhesive odors off the air intakes, and close the roof every evening before service begins. Where a hot-applied detail needs a full day, we pick one when the venue is dark. The same planning carries over to the brick-fronted blocks of Old Pasadena and the buildings around the Pasadena Civic Center, where the tenants and calendars differ but the discipline is the same.
Commercial Roofing Questions
Why does water stand beside a drain that was cleaned last month?
Cleaning clears the strainer, but it does not correct a low spot in the deck. If the slope around the sump has settled or the insulation has compressed, water collects there between storms. A tapered insulation section or a cricket restores the fall, which is the repair a cleaning cannot make.
Which membranes hold up near restaurant exhaust?
PVC and KEE sheets are formulated to resist fats and oils, so they are the usual choice around fans and kitchen discharge. EPDM and some TPO formulations can swell or soften with prolonged contact, though a protection pad and a regular cleaning routine slow the damage.
What should the roofer know before a life-science tenant moves in upstairs?
The equipment list, the weight of each piece and where it will sit. With that, curbs and supports can be framed to structure and flashed before the units arrive, and any membrane near the end of its life can be renewed ahead of the installation.
How do we learn what a roof from the 1920s has under its top layer?
Infrared scanning shows where moisture has collected, and a few core cuts show the layers, the deck and the condition of the insulation. Together they turn a guess into a plan, and the owner sees it before any scope is priced.
Can roof work happen near a theater or a restaurant without hurting evening business?
Daytime hours carry the loud and dusty work, fumes are kept away from entrances and air intakes, and the roof is closed each evening before service begins. Material staging is planned so deliveries never block a door that guests are using.
Have us look at the drains and details
A district full of kitchens and older offices keeps its roofs working hard, and the details decide whether they last. Call with the address and we will walk the drains, fans and curbs with you and tell you what we find.