Commercial Flat Roof Repair

& Leak Service

Commercial flat roof leak repair for offices, retail centers, and light industrial buildings. We handle TPO, EPDM, and modified bitumen membrane systems with trained employee crews.

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What Is Commercial Flat Roof Repair?

Commercial flat roof repair addresses leaks and damage on low-slope membrane roofing systems. Unlike pitched residential roofs with shingles, flat commercial roofs use membrane materials—TPO, EPDM, or modified bitumen—installed in large sheets with sealed seams. Water doesn't run off quickly, so proper drainage and intact membranes matter more.

We provide commercial roof repair contractors who work on office buildings, retail centers, light industrial facilities, and multi-tenant properties. Repairs range from localized membrane patches to seam re-welding, flashing replacement, and drainage corrections.

Common repair scenarios:

Leak tracking & diagnostics — Infrared moisture scanning, visual inspection, water testing to locate entry points

Flat roof membrane repair — Patch damaged areas, re-seal seams, replace compromised sections

Flashing & penetration repairs — Re-secure and re-seal around HVAC units, vents, drains, skylights

Drainage corrections — Address ponding areas, improve slope, clear or relocate drains

Who Needs Commercial Flat Roof Leak Repair?

Office Buildings

Multi-tenant spaces with sensitive electronics and climate control needs. Leaks disrupt operations and risk equipment damage. Scheduling repairs around business hours minimizes tenant impact.

Retail Centers

Storefront properties where interior water damage affects inventory and customer experience. Fast response prevents merchandise loss and maintains operational continuity during retail hours.

Light Industrial Facilities

Warehouses and manufacturing spaces with large roof areas. Equipment, stored materials, and production lines require protection from water intrusion. Access logistics often involve staging around operational zones.

Churches & HOA Common Buildings

Community spaces with limited budgets and irregular occupancy. Preventive repairs extend roof lifespan between major capital projects. Maintenance plans help avoid emergency spending.

What Are Common Commercial Flat Roof Problems?

Flat commercial roofs show specific failure patterns. Recognizing warning signs early reduces repair costs and prevents interior damage.

Warning signs requiring inspection:

Ponding water — Standing water 48+ hours after rain indicates drainage issues or membrane sagging

Interior water stains — Ceiling discoloration, tile damage, or visible dripping during or after storms

Blisters and bubbles — Trapped moisture or air pockets lifting membrane from substrate

Open seams — Separated or peeling seam tape/adhesive creating water entry points

Loose flashing — Gaps around roof penetrations, edges, or parapet walls

Membrane punctures — Physical damage from foot traffic, wind-blown debris, or equipment installation

Cracking or splitting — Age-related material deterioration, especially on modified bitumen systems

Visible wear patterns — High-traffic areas showing thinning or surface degradation

What Commercial Roofing Systems Do You Repair?

TPO Flat Roof Repair

Thermoplastic Polyolefin membranes use heat-welded seams. Light-colored surface reflects heat. Common on newer commercial buildings installed after 2000.

Typical TPO repairs: Re-weld failed seams, patch punctures or tears, address flashing separations, correct installation errors where panels weren't properly fused.

EPDM Flat Roof Repair

Ethylene Propylene Diene Monomer rubber membranes with taped or glued seams. Dark surface absorbs heat. Widely used across commercial applications for decades.

Typical EPDM repairs: Re-tape or re-adhere open seams, patch cuts or punctures, replace deteriorated flashing, address ponding-related degradation in seam areas.

Modified Bitumen Roof Repair

Asphalt-based multi-ply systems, often torch-applied or cold-adhered. Visible granulated surface. Common on older commercial buildings and built-up roof (BUR) systems.

Typical repairs: Re-seal lapped seams, patch blistered or cracked areas, replace damaged plies, address surface alligatoring, repair flashing at transitions.

How Does Commercial Flat Roof Repair Work?

Step 1: Inspection & Leak Tracking

Roof walk documents visible damage. Infrared moisture scanning identifies trapped water. Core samples check insulation saturation. Photos and measurements map problem areas. We trace leak sources—water travels horizontally under membranes before entering buildings.

Step 2: Repair vs Replacement Recommendation

Localized damage under 20-25% of roof area typically qualifies for commercial flat roof repair. Widespread failures, saturated insulation, or systems beyond typical lifespan (15-20 years) may require replacement. We explain both options clearly.

Step 3: Proposal & Phasing Plan

Detailed scope specifies materials, square footage, access requirements, and timeline. For occupied buildings, we coordinate work around business hours. Phased repairs let critical areas get addressed first while budgets catch up.

Step 4: Repair & Site Management

Safety protocols include fall protection, staging areas away from entrances, and equipment placement that minimizes disruption. Daily progress updates keep property managers informed. We protect HVAC units and roof-mounted equipment during work.

Step 5: Final Walk-Through & Maintenance Plan

Before-and-after documentation shows completed work. We walk the roof together, confirm repairs, and provide recommended inspection schedule. Maintenance plans catch small issues before they become emergency repairs.

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Should You Repair or Replace Your Commercial Flat Roof?

Commercial Flat Roof Repair Works When:
Damage is localized — Problem areas cover less than 20-25% of total roof area
Membrane age is reasonable — System hasn't reached typical lifespan threshold (TPO/EPDM: 15-20 years; Modified Bitumen: 12-18 years)
Deck structure is solid — No rot, sagging, or structural compromise in substrate layers
Leaks aren't recurring — Current issues stem from specific events (storm damage, recent equipment installation) rather than systemic failure patterns

Commercial Flat Roof Replacement Makes Sense When:
Failures are widespread — Multiple problem areas across entire roof surface indicating systemic breakdown
Insulation is saturated — Trapped moisture has compromised thermal performance and added structural load
System age is at/over lifespan — Membrane and underlying layers have reached end of serviceable life
Leaks recur frequently — Pattern of repairs in different spots suggests whole-system deterioration rather than isolated damage
Not sure which applies? Request a commercial flat roof inspection. We'll assess conditions honestly and explain both paths with costs.

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Commercial Flat Roof Replacement

What Affects Commercial Flat Roof Repair Cost?

Several factors determine commercial roof repair cost. Understanding these helps with budgeting and project planning.

Damaged area size → Repairs priced per square foot; larger areas cost more but achieve better per-unit pricing than small patches.

System type → TPO flat roof repair often costs less than EPDM or modified bitumen due to faster seam welding vs adhesive application. Material compatibility matters.

Roof access and logistics → Building height, staging requirements, and equipment lift needs affect labor costs. Downtown properties with limited staging access cost more.

Layers requiring removal → Cutting through multiple plies on built-up roofing systems takes longer than single-membrane TPO repairs.

Deck condition → Rotted or compromised substrate requires replacement before new membrane goes down. Adds material and labor.

Emergency/urgency factor → After-hours or weekend response costs more than scheduled maintenance repairs.

For detailed cost ranges by system type and damage scope, see our comprehensive flat roof repair cost guide.

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Do You Offer Commercial Flat Roof Maintenance?

Commercial flat roof maintenance extends system lifespan and reduces emergency repair frequency. Most membrane manufacturers require documented maintenance for warranty coverage. We recommend inspections twice yearly—spring and fall—plus after severe weather events.

Regular maintenance catches small problems before they escalate. A loose flashing detail identified during inspection costs minimal to re-secure. That same detail left unaddressed for two years leads to interior water damage, insulation replacement, and membrane repairs costing significantly more.

Maintenance inspection includes:

Debris removal from roof surface and drains

Drain inspection, cleaning, and flow testing

Seam condition monitoring and minor touch-ups

Flashing security checks at all penetrations

Membrane surface condition documentation

Ponding area assessment and drainage evaluation

Photo documentation for historical tracking

Written report with recommended actions

Recent Commercial Flat Roof Projects