How quickly can you respond to an active commercial roof leak?

We prioritize active leak situations. Contact us by phone for the fastest response — our team can typically schedule an inspection within 24–48 hours, and sooner for urgent situations.

Do you charge for the initial commercial roof leak inspection?

We provide written proposals following our inspection at no charge. Contact us to schedule a leak assessment.

Will a commercial roof repair void my existing roof warranty?

Not if it's done by an approved contractor using approved materials. Costa Roofing holds manufacturer approvals with Sarnafil, APOC, SIKA, and Western Colloid — ensuring repairs on warranted systems meet manufacturer requirements and don't void existing coverage.

What is the difference between a roof repair and a roof restoration?

A repair addresses a specific damaged area or failure point. A restoration (typically an acrylic or silicone coating system) treats the entire roof surface and is appropriate when a roof shows widespread wear but the underlying structure is still sound. Costa Roofing can advise on which is the right solution for your property.

Commercial Roof Leak Repair in Los Angeles & Southern California

A commercial roof leak doesn’t wait for a convenient time. Whether it’s a slow drip that’s been ignored for weeks or an active pour during a winter storm, the damage compounds every hour it goes unaddressed — ceiling tiles, drywall, insulation, inventory, and tenant relationships all paying the price. Costa Roofing specializes in commercial roof leak detection and repair for property managers, building owners, and HOAs across greater Los Angeles and Southern California. We find the source, fix it correctly, and document everything — so you’re not dealing with the same leak again next season.

Leak happening now? Call us: (424) 218-6573

Why Commercial Roof Leaks Are Hard to Find — and Easy to Get Wrong

Fixing a commercial roof leak starts with finding the actual source — and that’s harder than it sounds. Water travels. It enters through one point on the roof, migrates horizontally across conduits, beams, and insulation layers, and drips through a ceiling that may be 20 or 30 feet from where the problem actually lives.

This is why so many commercial properties end up with repeat leaks: a roofer patches the visible drip point without ever identifying the true source. At Costa Roofing, every repair begins with a thorough inspection — interior and exterior — before any work is proposed. You receive a written scope and photos documenting the cause of the leak, not just its symptoms.

Common Causes of Commercial Roof Leaks

Understanding why leaks happen is the first step toward preventing them. The most common causes we find on commercial roofs across Los Angeles and SoCal:

Deteriorated Mastic and Sealants

Mastic around penetrations, flashings, and equipment curbs dries out and cracks over time — especially under the relentless UV exposure of the Southern California climate. This is one of the most frequent sources of commercial roof leaks and one of the most preventable with routine maintenance.

Clogged or Damaged Roof Drains

Flat and low-slope commercial roofs depend entirely on proper drainage. Debris-blocked drains cause water to pond and find any available path through the membrane — including seams, fastener holes, and aged penetrations.

Flashing Failures

Where the roof membrane meets walls, curbs, skylights, HVAC equipment, and other penetrations, flashing provides the seal. When flashing separates, rust, or are improperly installed, they can become the primary entry point for water.

Foot Traffic Damage

Rooftop HVAC service, antenna work, and tenant improvement projects all bring people — and tools — onto the roof. Punctures, scuffs, and displaced materials from foot traffic are a leading cause of leaks in multi-tenant commercial and apartment buildings.

Age and Natural Weathering

Even well-installed roofing systems have a lifespan. Membranes crack and split. The asphalt in built-up roofing systems slowly dry. As materials age, their ability to repel and shed water diminishes — and leaks follow.

Poor Prior Repairs

One of the most frustrating situations a property manager faces is a repeat leak caused by a previous contractor’s inadequate repair. If a leak source was never properly identified, a patch will not succeed.

Warning Signs Your Commercial Roof Is Leaking

Don’t wait for water on the floor. These early indicators mean it’s time to call for an inspection:

The sooner a leak is caught, the lower the repair cost — and the lower the risk of mold remediation, structural damage or tenant complaints.

Our Commercial Roof Leak Repair Process

We don’t show up, pour some silicone on the roof and leave. Here’s what a Costa Roofing leak repair actually looks like:

Step 1 - Interior Inspection

We start inside. Ceiling stains, wet insulation, and water trails help us map the likely migration path before we ever get on the roof.

Step 2 - Roof Inspection & Leak Detection

A thorough topside inspection documents the condition of the membrane, flashings, drains, penetrations, and any prior repair work. We identify the source — not just the symptom.

Step 3 — Written Proposal with Photos

Before any work begins, you receive a clear written scope of work with photos documenting the cause of the leak. No surprises, no ambiguity.

Step 4 — Repair

Using manufacturer-approved materials and methods, our crews repair the identified source. We work with all major commercial roofing systems — see the full list below.

Step 5 — Documentation and Follow-Up

After completion, we provide photo documentation of the completed repair work. For property management clients, this becomes part of your building's roof history — useful for budgeting, future repairs and warranty tracking.

Roofing Systems We Repair

Costa Roofing has the expertise and manufacturer approvals to repair virtually any commercial roofing system found on Los Angeles and SoCal properties:

Single-Ply Membranes — PVC, TPO, and EPDM systems

Built-Up Roofing (BUR) — Gravel and granule-surfaced systems

Sarnafil PVC Systems — Certified SIKA Sarnafil installer

Shingle and Tile Roofing — Multi-family and mixed-use applications

Modified Bitumen — Torch-applied and cold-process systems

Acrylic and Silicone Coating Systems — Including Western Colloid, Soprema, ASC, Manta and APOC systems

Metal Roofing — Seam repairs, penetration and transition sealing

Why Property Managers and Building Owners Choose Costa Roofing

Manufacturer-Approved

Costa Roofing holds approvals with SIKA Sarnafil, GAF, Soprema, PolyGlass, Duro-Last, Manta, ASC, APOC, and Western Colloid — meaning repairs on warranted systems are performed to manufacturer standards and don't void existing coverage.

Commercial-Focused

We work primarily with commercial properties, multi-family buildings, HOAs and institutional clients across Southern California. Property and Facility managers at Air Communities, Holland Partners, Cushman & Wakefield, Colliers, Charles Dunn and E&S Ring trust Costa Roofing to protect their assets.

Documented and Accountable

Every job is photographed before, during, and after work is performed. You get written proposals before work starts and documentation after it's done — the standard your ownership groups and investors expect.

Licensed and Insured

CSLB License #1061541. Fully licensed, bonded, and insured for commercial and HOA roofing work throughout California.

No Bandaid Repairs

We're not in the business of temporary fixes. Our goal is to identify the actual source of your leak and repair it correctly the first time — because repeat service calls don't serve anyone.

Commercial Roof Leak Repair — Frequently Asked Questions

How quickly can you respond to an active leak?

We prioritize active leak situations. For the fastest response, call us directly at (424) 218-6573. During weather events, our team has crews ready and available for dispatch to emergency situations across Southern California. Don’t wait on an active leak — water damage compounds quickly and repair costs grow the longer leaks go unaddressed.

Do you charge for the initial inspection?

We provide roof inspections and written proposals at no charge. After our inspection, you’ll receive a recommended scope of work in writing with photos documenting the condition of the roof and the causes of any issues — all before any roof work is approved or scheduled.

Can you repair a flat roof leak without replacing the entire roof?

In most cases, yes. Targeted repairs are appropriate when damage is isolated, the membrane is structurally sound, and insulation beneath hasn’t been saturated. If replacement or restoration is a better long-term value, we’ll tell you that directly — with data to back it up.

What does a commercial roof leak repair cost?

Repair costs vary significantly depending on the roofing system, the extent of damage, and accessibility. Minor leak repairs typically start in the hundreds; more complex repairs or extensive membrane work will be higher. Every job receives a detailed written estimate before work begins.

Will the repair void my existing roof warranty?

Not if it’s done by an approved contractor using approved materials. Costa Roofing holds manufacturer approvals with SIKA, Sarnafil, Duro-Last, Soprema, APOC, Western Colloid, Manta, ASC, GAF, PolyGlass — ensuring repairs on warranted systems meet manufacturer requirements.

What's the difference between a repair and a restoration?

A repair addresses a specific area of damage or failure point — a leak source, failed flashing, membrane puncture, etc. A restoration resurfaces the entire roof with an acrylic or silicone coating system, extending its lifespan by up to 20 years without tear-off and replacement. A roof restoration is typically recommended when a roof has widespread wear but the underlying system and structure are still sound. After a no-cost roof inspection, we’ll advise you on which makes more financial sense for your property.

Do you service the whole LA area?

Yes. We serve property owners and managers throughout greater Los Angeles and Southern California, including Marina del Rey, Long Beach, Santa Monica, Westlake Village, Culver City, Pasadena, Glendale, the South Bay, and beyond.

How do I know if my leak is from the roof or something else (HVAC, plumbing)?

A proper interior and exterior inspection can determine the source. We routinely rule out HVAC condensation, plumbing penetration failures, and other non-roofing causes as part of our inspection process.

Serving Commercial Properties Across Los Angeles and Southern California

Costa Roofing provides commercial roof leak repair to property managers and building owners throughout:

Get a Commercial Roof Leak Assessment

If your commercial property is showing signs of a leak — or you want to address a known issue before the next rain — contact Costa Roofing for a written assessment.

CSLB License #1061541 | Serving Greater Los Angeles & Southern California