Flat Roof Leak Repair in California means finding the water entry point, not just the ceiling stain. We handle commercial flat roof leak repair and residential flat roof patch repair across the state, from Burbank to Bakersfield. When ponding water, failed flashing, or storm damage pushes water inside, we tarp, dry, and seal the same day.
Flat Roof Leak Repair in California is the process of locating and sealing water intrusion on low-slope roofs, then restoring the membrane so it sheds water again. On a TPO or EPDM roof, that means scanning seams, penetrations, and drains with an infrared camera and moisture meter before we cut anything open. We pull back the failed membrane, replace saturated insulation, and re-weld or re-adhere a patch that matches the original system. Most repairs close in a single visit.
California flat roofs take a beating from UV, thermal shock, and months of dry heat followed by winter rain. Ponding water sits on low spots, seams open, and flashing pulls away from parapet walls. If you search flat roof leak repair near me after a storm, you are usually looking at a clogged drain or a seam that finally gave out. We see it in Irvine business parks, San Francisco mixed-use buildings, and Sacramento strip centers alike.
Every flat roof leak repair includes a full diagnostic, material-matched patch, and water test. We do not leave until we have proven the leak is stopped. Here is what you get as standard.
We inspect the entire roof, not just the area above the stain. Using an infrared camera and moisture meter, we trace the water path and identify every entry point. You get a written finding with photos and moisture readings before we start any repair.
We use the same membrane system as your existing roof: TPO, EPDM, or modified bitumen. We carry Firestone, Carlisle SynTec, and GAF materials. The patch is heat-welded or adhered per manufacturer spec so it holds through California's temperature swings.
If water has soaked the insulation, we cut it out and replace it. Leaving wet insulation causes mold and destroys the roof deck over time. We dispose of the old material and install new insulation that matches the R-value of the surrounding roof.
Before we pack up, we flood the repair area or run a controlled hose test. We take new moisture readings to confirm the leak is stopped. If water still moves, we keep working. You do not pay for a repair that has not been verified dry.
You get a summary of the work: what we found, what we repaired, what materials we used, and what to watch. Photos document the before and after. This report protects your manufacturer warranty and supports any insurance claim you file.
You call (877) 299-0450 and describe what you are seeing: ceiling stains, ponding water, a drip near a skylight. We ask the right questions to decide if you need emergency flat roof repair or a scheduled diagnostic. If water is actively entering, we dispatch a tarp crew first. If it is a slow seep, we book a full inspection.
A technician walks the roof with a moisture meter and infrared camera. We check seams, flashing, drains, penetrations, and any rooftop equipment. On a 20,000-square-foot commercial roof, this takes 45 to 90 minutes. You get a written finding: where the water is entering, how far it has spread, and what it will take to fix it.
We remove the failed membrane and any saturated insulation, then install the patch using the same material system. TPO gets heat-welded. EPDM gets spliced with manufacturer adhesive. Modified bitumen gets torched or cold-applied depending on the spec. Most repairs take two to four hours. We test with water before we close up.
Before we leave, we flood the repair area or run a hose test to confirm the leak is stopped. We take moisture readings again and photograph the dry membrane. If water still moves, we keep going. You do not pay for a repair that has not been verified. That is the standard we hold every crew to.
You get a written summary with photos, moisture readings, and material specs. We note any areas that need watching, like a drain that clogs seasonally or a seam that is starting to lift. If you want, we schedule a post-storm roof inspection before the next rainy season. That is how you avoid a repeat call.
You call (877) 299-0450 and describe what you are seeing: ceiling stains, ponding water, a drip near a skylight. We ask the right questions to decide if you need emergency flat roof repair or a scheduled diagnostic. If water is actively entering, we dispatch a tarp crew first. If it is a slow seep, we book a full inspection.
Detects temperature differences caused by moisture trapped under the membrane. We use it to map the leak path without cutting open the roof. It shows us exactly where the water is.
Confirms the infrared findings with direct readings. We probe the membrane and insulation to measure water content. This tells us how far the damage has spread and what needs to be removed.
Used when we need to secure new insulation or substrate material. We set the depth so it does not puncture the membrane above. It speeds up the repair without sacrificing quality.
For lifting membrane and cutting patches to size. We make clean cuts so the new patch fits tight. A sloppy cut is where leaks start again.
Applies sealant around flashing, penetrations, and terminations. We use manufacturer-approved sealants that stay flexible through California's temperature swings.
OSHA-compliant fall protection for every crew member on the roof. We do not cut corners on safety. That protects our team and your liability.
A 12,000-square-foot TPO roof in Irvine had a leak at an HVAC curb. Water was dripping into a tenant space and the ceiling tiles were stained. The property manager had tried sealant twice with no luck.
After: We removed the failed sealant, cleaned the curb, and installed a new TPO patch with heat-welded seams. We replaced two ceiling tiles worth of wet insulation. Water test passed. The leak has not returned in two rainy seasons.
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A warehouse roof had a low spot that held water for days after every storm. The EPDM membrane had a pinhole leak that was soaking insulation over a 20-foot radius. The owner saw a stain on the warehouse floor.
After: We cleared the drain, cut out the saturated insulation, and installed a new EPDM patch. We also added tapered insulation to correct the slope. The ponding stopped. Moisture readings confirmed the deck was dry.
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A 1960s building in Midtown Sacramento had a modified bitumen roof with multiple leaks. The owner had patched it with roof cement several times. Water was staining the ceiling in two offices.
After: We did a full infrared survey and found three separate leak paths. We repaired each with torch-down modified bitumen patches. We replaced wet insulation in two areas. The leaks stopped and the ceiling dried out.
Book this service →Flat roofs fail in predictable ways. Here are the most common problems we fix and what happens if you leave them alone.
Ask a pro →We locate the low spot, clear the drain, and if needed install tapered insulation or a new drain to correct the slope. We also repair any membrane damage caused by the ponding. The goal is water off the roof within 48 hours of a storm.
We remove the old flashing, clean the substrate, and install new counter-flashing with proper sealant. We water-test the penetration before we close it up. If the skylight itself is cracked, we can replace it or seal it depending on condition.
We clean the seam, heat-weld TPO or splice EPDM with manufacturer adhesive, and apply a seam probe to verify the bond. We check every seam in the immediate area because if one failed, others are close behind. The repair is warrantied.
We clear the drain, inspect the drain body for cracks, and repair or replace it if needed. We also check the gutters and downspouts. If the drainage system is undersized, we can recommend upgrades to handle heavy rain events.
Most flat roof leak repairs in California run $450 to $1,800 in 2026, depending on roof size, membrane type, and how far water has spread. A simple flashing reseal might be $450. A TPO section replacement with saturated insulation removal can reach $1,800 or more. Emergency tarping is separate and typically $300 to $700. We give you a written price before we start.
You fix a flat roof leak by finding the entry point, removing the failed membrane, and installing a material-matched patch. On TPO, that means heat-welding a new section. On EPDM, it means splicing with manufacturer adhesive. On modified bitumen, it means torching or cold-applying a patch. Then you water-test. If you skip the water test, you are guessing. We do not guess.
The most common causes are ponding water, failed seams, flashing pulled away from parapet walls, clogged drains, and UV degradation. California's dry summers bake the membrane, then winter rain finds every weak point. Skylight leaks and chimney leaks are common where flashing was never properly counter-flashed. Storm damage from wind-driven rain also drives water sideways under seams.
Yes, most flat roof leaks can be patched if the membrane around the leak is still sound. We cut back to good material, install a patch using the same system, and water-test it. If the surrounding membrane is saturated or brittle, a patch will not hold and we will tell you that upfront. Sometimes a section replacement is the honest answer.
We deliver flat roof leak repair across California, from the coast to the Central Valley. Our crews are based in regional hubs so we can reach you fast, whether you need emergency flat roof repair or a scheduled commercial flat roof leak repair. Here are some of the cities we serve every week.
Burbank has many commercial buildings and studios with flat roofs. We repair TPO and modified bitumen leaks, often at rooftop HVAC units and skylights. Same-day tarping available.
↗ 02 DowneyDowney's mix of residential and commercial flat roofs keeps us busy. We fix ponding water issues, flashing leaks, and clogged drains. Most repairs are done in one visit.
↗ 03 ArcadiaArcadia homes and businesses with flat roofs often see leaks at transitions to shingle or tile. We repair both sides of the transition so the leak stops at the source.
↗ 04 IrvineIrvine's business parks have large TPO roofs. We handle commercial flat roof leak repair, including heat-welded patches and insulation replacement. We document everything for warranty.
↗ 05 Lake ForestLake Forest residential flat roofs take a beating from the sun. We repair UV-damaged membrane, reseal flashing, and clear drains. Emergency service available.
↗ 06 Fountain ValleyFountain Valley property owners call us for flat roof patch repair after storms. We tarp first if needed, then do a permanent repair with material that matches the existing roof.
↗ 07 El CajonEl Cajon's inland heat cracks flat roof membranes. We repair with UV-resistant materials and check for thermal damage at seams. Same-day estimates available.
↗ 08 San BernardinoSan Bernardino gets intense summer storms that find every flat roof weakness. We provide emergency tarping and permanent repairs for commercial and residential roofs.
↗ 09 MurrietaMurrieta's growing residential areas have many flat roof sections. We fix leaks at skylights, chimneys, and transitions. We also clear gutters and drains to prevent ponding.
↗ 10 Thousand OaksThousand Oaks commercial buildings often have EPDM roofs. We splice patches with manufacturer adhesive and water-test every repair. Documentation provided for your records.
↗ 11 BakersfieldBakersfield's extreme heat destroys flat roof membranes. We repair UV damage, replace cracked flashing, and install reflective coatings to extend roof life. Fast response.
↗ 12 SacramentoSacramento's rainy season keeps us busy with flat roof leaks. We repair modified bitumen and TPO roofs, clear clogged drains, and fix ponding issues. Licensed and insured.
↗ 13 San FranciscoSan Francisco's fog and salt air corrode flat roof flashing. We use corrosion-resistant materials and repair leaks on older tar-and-gravel roofs. Emergency service available.
↗ 14 ConcordConcord homes and businesses with flat roofs get expert leak repair. We diagnose with infrared cameras and fix the source, not just the stain. Most repairs done in one day.
↗ 15 San MateoSan Mateo's coastal climate stresses flat roofs. We repair EPDM and TPO leaks, reseal penetrations, and check for salt damage. Same-day tarping for emergencies.
↗Water is not going to wait, and neither should you. Call (877) 299-0450 for same-day emergency tarping or a scheduled flat roof inspection. We are licensed, insured, and we document every repair. One call and we are on our way.
Call Now (877) 299-0450 →Call (877) 299-0450 any hour, any day. A live dispatcher answers, takes your address, and sends the nearest crew. Most California metro calls get a technician on site within 60 to 90 minutes. You can also email [email protected] with photos of the leak.