An office roof tends to start leaking within a season or two of a tenant move, and the cause is rarely the membrane. A new tenant brings a new rooftop unit, a supplemental exhaust fan or a dedicated cooling line, and every one of those means a hole cut by a mechanical contractor who is not thinking about the roof. The curb is set a little crooked, the flashing is laid as an afterthought, and the sealant joint around the pipe is the only thing between a summer storm and the ceiling tiles of the suite below. Office building roofing in Pasadena, CA is mostly the work of cleaning up after those installations and making sure the next one goes in properly. We rebuild each penetration as a proper detail, with formed flashing, counterflashing and a drained curb, and we keep a record of every change so the roof stays legible as tenants come and go.
Office Building Roofing in Pasadena, CA
Tenant Improvements and Rooftop Units
Pasadena owners are re-tenanting older space at a steady pace. The Burbank, Glendale and Pasadena office market had a vacancy rate of 26.1 percent in the fourth quarter of 2025, and landlords are repositioning buildings to compete. Arrowhead Pharmaceuticals leased 48,882 square feet in downtown Pasadena. For any office or laboratory fit-out, we review the equipment schedule and roof details before new openings are added.
We help owners get ahead of it. Before a lease is signed, we survey the roof to see what it can carry and where new penetrations should go, and we show the mechanical contractor which areas are off limits. Each new curb is flashed by a roofer, not by the trade that cut the hole. If a landlord has not yet reroofed, our rooftop equipment curbs and supports work can often be done as part of the improvement, so the warranty and the leak responsibility stay in one place.
Brick Facades and Parapets in Old Pasadena
Old Pasadena covers about 22 blocks lined with historic brick-facade storefronts, where small offices and tech companies work upstairs from the street-level shops. Where one of those buildings has a flat roof behind a parapet, the roof edge is a masonry detail more than a membrane detail. Mortar joints open, the cap stones loosen, and water gets behind the counterflashing and runs down the interior face of the wall into the offices below. Staging is tight, since the street below is busy and the sidewalks are full.
We repair the wall before we touch the roof, repointing the open joints, resetting the caps and installing flashing into a cut reglet instead of surface-mounting a strip of metal. In Old Pasadena and the adjoining Playhouse District, we plan around street closures, loading windows and tenants who cannot hear a hammer during a call. The goal is a parapet that looks the same from the sidewalk and keeps the water out behind the brick.
Roof Terraces, Gardens and Plaza Decks
Office towers with amenity decks carry a more complicated roof than a bare membrane. Plaza Las Fuentes, a 1989 development facing City Hall, pairs an eight-story office tower with a hotel, shops and roof terraces. Pavers, planters and drains sit on top of the waterproofing, and a problem underneath cannot be fixed without lifting everything above it.
These assemblies fail at drain bodies, planter walls and the transition from deck to wall, where water sits behind a curb of concrete. We find the leak with flood testing and moisture scanning, repair only the zone that needs it, and put protection board and drainage mat back in order. A complex with terraces over occupied space, like Plaza Las Fuentes in the Pasadena Civic Center, is slower than an ordinary reroof, and the planning is correspondingly more careful.
Roof Budgets in a Soft Office Market
When about a quarter of a market sits empty, owners watch every dollar, and a roof is a large one. The sensible response is to decide what the roof actually needs. South Lake Avenue, called the corporate center of Pasadena, has a daytime population above 56,000 and plenty of competition for tenants, and a leaking ceiling in a visited suite costs more than a patch ever would. A roof capital plan sorts the work into what must happen now, what can wait a year and what is a cosmetic choice.
For a building changing hands, due diligence roof surveys give a buyer a clear picture of remaining life. We put costs in ranges after a walk, not before, and we explain which repairs protect the building and which only change its appearance. Owners who manage several buildings can bring that thinking to their whole property management program.
Reroofing Above Working Suites
Tenants notice noise, dust and smell, and a roof crew above a call center or a conference room is easy to hear. We schedule loud work such as tear-off and fastening for early mornings or off hours when we can, keep fumes away from air intakes, and give the property manager a daily plan to forward to tenants. A commercial roof replacement over occupied suites needs a protected path for materials, and we keep the lobby and parking clear. Medical office buildings have stricter rules still, and we plan office work with the same care. Patient areas change the staging plan; the same protections apply on hospital roofs.
For an office owner, the closeout should leave a usable maintenance record. We mark each repaired curb and drain on the roof plan and include photographs of the finished termination. If another mechanical change comes later, the facilities team can identify where the roof system was opened and what material was used to close it.
Commercial Roofing Questions
Why did my roof start leaking right after a new tenant moved in?
New equipment usually means new penetrations. A rooftop unit, a fan or a pipe run was probably added with a curb or sleeve that was not flashed to the standard of the roof. We compare the roof against the tenant's mechanical plan, find each new opening and rebuild its flashing, because the membrane itself is rarely at fault.
Can a brick parapet in Old Pasadena be repaired without scaffolding the whole building?
Often, yes, with swing stages or lifts limited to the walls that need work. Street frontage and pedestrian traffic affect what is possible, and permits and sidewalk protection come first. We review the access plan with the property manager and fit the staging to the walls that are actually failing.
Do I need to replace a roof before leasing vacant space?
Only when the roof's condition will cost you in the lease negotiation. Prospective tenants and their brokers check the roof, and a known leak above a suite hurts the deal. A condition survey tells you whether a repair, a coating or a replacement fits the building, and it gives you a written record for the tenant's engineer.
How noisy is a reroof above occupied offices?
The loudest phases are tear-off and mechanical fastening, and we schedule those for hours when the tenants are least affected. Welded or adhesive systems are quieter than some alternatives. We give property managers a daily notice so tenants know what to expect, and we keep a phone line open for complaints.
What happens to a rooftop terrace during roof work?
Pavers and planters are lifted in sections, set aside and returned once the waterproofing below is tested. The terrace is closed during that time, and we coordinate the reopening date with the tenant who uses it. If a drain is failing, we replace it while the deck is open instead of closing it twice.
Have Us Look at Your Penetrations
Tell us which suite is dripping and which tenants have moved in lately. We will look at the curbs, parapets and drains on your office building roof, because those details decide whether the roof lasts, and we will put what we find in writing. Call at any hour if water is coming through the ceiling.