Controlled Water Testing
When tracing does not settle it, we test. We isolate one suspect area at a time and run a controlled stream of water over it, starting low on the roof and working upward, while someone watches the ceiling below. The moment water appears inside, we know which detail admitted it. Skipping this step is how roofs end up with five patches and no repair, since each patch is a guess about where the water got in.
Testing also protects the owner against paying for the wrong fix. If a leak that appears to come from a rooftop unit actually enters at the parapet wall beside it, no amount of resealing the unit will help. We keep records and photographs of each test so the finding can be shown to a tenant, a general contractor or an insurer, and the same record is what documents the damage when a claim follows, which is where roof insurance claim assistance begins.
Drains, Penetrations and Low Corners
Many leaks start where the roof collects water. A drain with a loose clamping ring, a cracked bearing, or a screen packed with debris will back water onto the membrane, and a low corner that ponds will find any pinhole in the sheet. In the foothills after a fire like the January 2025 Eaton Fire, ash and burned material can clog screens and scuppers once the first rains arrive. We clear the drains, check the clamping hardware and flashing, and look hard at the spots where water stands after the storm has passed.
Where the repair involves ponding, we address the cause as well as the leak. A ponding water roof repair may mean a tapered cricket, a deeper sump, or a drain moved to the true low point. Penetrations get formed boots or rebuilt flashing, and parapet walls get their counterflashing reset into the reglet, since a small, repeatable detail is cheaper to fix correctly than to patch repeatedly.
The First Rain After a Dry Summer
Pasadena's summers are long and dry, and that hides weakness. A June high of 113 F pulls sheet metal and membrane through hard thermal cycles, and joints that have quietly opened show it the first time rain arrives. February is the wettest month, with about 3.9 inches, and the San Gabriel Mountains add roughly 6 inches a year over downtown Los Angeles through orographic rainfall. A roof that has not been checked since spring meets that water with its defects intact.
We recommend a walk before the rainy season, with drains cleaned and the known weak spots reviewed. If a leak appears in the middle of a storm, we respond to stop the water in the building, and we do the permanent fix in the first dry window afterward. For active water that cannot wait for a scheduled visit, emergency roof repair is the next call, at any hour.
Leaks in Healthcare and Tenant-Sensitive Spaces
Some leaks cannot be tolerated for a single night. In the HeArt District around Huntington Hospital, water entering near patient care, imaging, labs or sterile supply is an operational problem as much as a roofing one. We coordinate with facilities staff on access, infection control and timing, and we set up temporary protection above sensitive rooms before we work on the permanent fix.
The temporary stop and the permanent repair are separate jobs, and we label them that way. A temporary measure buys a dry building until conditions allow the real work. The permanent repair rebuilds the detail so the same spot does not leak again, and the permanent commercial roof repair is carried out with the same fit and finish as any planned repair, with the finding written up for the building file.
Commercial Roofing Questions
Why does my ceiling leak in one room when the roof damage is somewhere else?
Water rarely drops straight down. It travels along the insulation, the deck flutes and the framing until it finds an opening, so the stain may sit several bays from the entry point. We map the stains and trace upstream, then confirm with water testing where needed, so the repair goes at the actual entry and not at the spot that happens to be above the stain.
Can a leak be fixed while it is still raining?
In most cases we can make the building safe and stop the worst of the water, but a lasting repair needs a dry surface. Adhesives, welds and sealants will not bond to a wet membrane. We place a temporary measure during the storm and schedule the permanent detail work for the first dry window, so you are not paying twice for the same patch.
How much of the roof is affected once it has leaked?
That depends on how long water has been entering and where it traveled. A new, short-lived leak may have wetted only a small area. One that has run for months can saturate insulation well beyond the entry point. We use moisture scanning and core cuts to find the extent, and we tell you whether the finding supports a repair or points toward replacement.
Will you check other areas when you find the leak?
We do, because leaks seldom come from a single flaw. Once one detail has failed, nearby flashings, laps and drains have usually seen the same stress. We walk the surrounding roof, photograph anything that is close to failing, and give you a short list of what to fix now and what can wait, so the next storm does not reveal a second leak.
What should I do inside the building until the roof is fixed?
Contain the water first. Move equipment and stock away, set a bucket or tarp under the drip, and open the ceiling tile if it is sagging so the water drains rather than collapsing the tile. Photograph the area and send us the photos with the time of the storm. We use that record to narrow the search and to document the damage for any claim.
