How to Repair a Commercial Roof: Complete Guide for NJ Business Owners

1. What is Commercial Roof Repair?

Commercial roof repair refers to the process of fixing damage, leaks, and deterioration on commercial building roofs. Unlike residential roofing, commercial roofs present unique challenges due to their size, flat or low-slope design, specialized materials, and the need to minimize business disruption during repairs.

How Commercial Differs from Residential Roof Repair

When to Repair vs. Replace Your Commercial Roof

Not every roof problem requires full replacement. Consider repair when:

• Damage affects less than 25-30% of the roof area
• The roof is less than halfway through its expected lifespan
• Repair costs are under 50% of replacement cost
• No structural damage or widespread membrane deterioration exists
• Problems are isolated (single leak, localized damage)

For guidance specific to your situation, see our detailed commercial roofing guide for Essex County.

2. Types of Commercial Roof Systems We Repair

Different commercial roofing materials require different repair techniques and expertise. Here are the most common systems in Essex County and their typical repair needs:

TPO Roofing (Thermoplastic Polyolefin)

TPO is one of the most popular commercial roofing materials due to its energy efficiency and durability. Common repair issues include seam failures where heat-welded seams separate, punctures from foot traffic or debris, and membrane shrinkage that pulls seams apart.

TPO repair cost: $3-5 per square foot

EPDM Rubber Roofing

EPDM (Ethylene Propylene Diene Monomer) is a durable single-ply rubber membrane. Typical problems include seam separation, membrane shrinkage, and punctures. EPDM repairs use specialized adhesives and patches that bond to the existing rubber membrane.

EPDM repair cost: $4-8 per square foot

PVC Roofing

PVC (Polyvinyl Chloride) roofing offers excellent chemical resistance, making it ideal for restaurants, manufacturing facilities, and buildings with rooftop equipment. Issues include membrane tears, seam problems, and flashing failures.

PVC repair cost: $4-7 per square foot

Modified Bitumen

This multi-layer asphalt system provides excellent waterproofing and is common on older commercial buildings. Common problems include blistering, cracking, and seam failures. Repairs involve torching new material or applying cold-process adhesives.

Modified bitumen repair cost: $4-8 per square foot

Built-Up Roofing (BUR)

Traditional "tar and gravel" roofs use alternating layers of bitumen and reinforcing fabric. Issues include alligatoring (surface cracking), ponding water, and blistering. BUR repairs require specialized equipment and expertise.

BUR repair cost: $5-10 per square foot

Metal Roofing

Commercial metal roofs (standing seam, corrugated) can last 40-60 years with proper maintenance. Common issues include rust, loose fasteners, sealant failure, and panel damage. Learn more about metal roofing in our metal roofing service page.

Metal roof repair cost: $5-12 per square foot

3. Common Commercial Roof Problems

Understanding common commercial roof problems helps you identify issues early before they cause expensive damage. Here are the most frequent issues we encounter in Essex County:

Leaks and Moisture Infiltration

The most common commercial roof problem, leaks typically occur at penetrations (HVAC units, vents, skylights), seams, flashings, and damaged membrane areas. Signs include water stains on ceiling tiles, dripping water, and mold or mildew growth. If ignored, even small leaks can cause thousands in interior damage.

Need help with a leak? See our commercial roof leak repair guide.

Ponding Water

Water that remains on a flat roof 48+ hours after rain indicates drainage problems. Causes include improper slope, clogged drains, HVAC condensation, and structural sagging. Ponding accelerates membrane deterioration and can lead to catastrophic failures.

Membrane Damage

Membrane damage occurs from foot traffic, fallen debris, equipment installation, UV degradation, and weather impacts. Signs include visible cuts, punctures, blistering, or areas where the membrane has pulled away from the substrate.

Flashing Failures

Flashing seals the roof around penetrations, edges, and transitions. When flashing fails due to age, thermal movement, or poor installation, water infiltrates these vulnerable areas. Common flashing problems occur at parapet walls, HVAC curbs, pipes, and roof edges.

Storm Damage

New Jersey storms bring hail, high winds, and flying debris that can damage commercial roofs. Post-storm inspection is critical—damage may not be immediately visible but can cause problems months later. R&E Roofing provides storm damage repair services with insurance claim assistance.

Poor Installation Issues

Improper installation leads to premature failures. Common problems include inadequate seam welding, insufficient adhesion, missing or improperly installed flashings, and incorrect materials. These issues often appear 2-5 years after installation—another reason to choose experienced, certified contractors.

4. Commercial Roof Repair Process

Understanding the repair process helps you know what to expect and evaluate contractor quality. Here's how R&E Roofing approaches commercial roof repairs:

Step 1: Inspection and Assessment

Every repair starts with a comprehensive roof survey. We inspect the entire roof surface, flashings, penetrations, drains, and interior for water damage signs. For difficult-to-detect leaks, we may use infrared scanning to identify moisture trapped beneath the membrane. Inspection typically takes 1-2 hours for average-sized commercial roofs.

Step 2: Damage Documentation

We document all damage with photos and detailed notes. This documentation serves multiple purposes: creating the repair scope, supporting insurance claims, and providing records for your building files. You receive a complete report regardless of whether you proceed with repairs.

Step 3: Material Selection

We select repair materials compatible with your existing roof system. For warranty compliance, we use manufacturer-approved products. When appropriate, we recommend upgrades that improve durability or energy efficiency.

Step 4: Repair Execution

Our crews work efficiently to minimize business disruption. Repairs include surface preparation, material installation, and quality verification. We clean the work area thoroughly and remove all debris upon completion.

Step 5: Quality Verification

After completing repairs, we conduct water testing (when practical) and final inspection. We photograph completed work and provide documentation for your records. Our workmanship warranty covers all repairs.

5. Commercial Roof Repair Costs in NJ

Understanding repair costs helps you budget appropriately and evaluate contractor quotes. Here's what commercial roof repairs typically cost in Essex County:

Cost by Repair Type

Cost by Material (Per Square Foot)

• TPO repair: $3-5 per square foot
• EPDM repair: $4-8 per square foot
• PVC repair: $4-7 per square foot
• Modified bitumen: $4-8 per square foot
• Built-up roofing: $5-10 per square foot
• Metal roofing: $5-12 per square foot

Factors Affecting Cost

• Damage extent: Larger affected areas cost more
• Roof accessibility: Multi-story buildings increase labor
• Material type: Some systems require specialized equipment
• Emergency timing: After-hours/weekend service costs more
• Hidden damage: Water damage below membrane adds cost

When Replacement is More Cost-Effective

Consider replacement over repairs when:

• Repair costs exceed 50% of replacement cost
• You've had multiple repairs in the same year
• The roof is over 20 years old
• Widespread membrane deterioration exists
• Energy bills have increased significantly

6. Signs Your Commercial Roof Needs Repair

Catching problems early prevents expensive emergency repairs. Watch for these warning signs:

Exterior Warning Signs

• Visible membrane damage, blistering, or bubbling
• Ponding water remaining 48+ hours after rain
• Damaged, loose, or missing flashing
• Rust on metal components or fasteners
• Sagging or soft spots when walking on the roof
• Vegetation growth (indicates moisture retention)
• Separation at seams or edges
• Clogged or damaged drains

Interior Warning Signs

• Water stains on ceiling tiles or walls
• Dripping water (obvious leak)
• Musty or moldy odors
• Increased HVAC energy costs
• Peeling paint or wallpaper
• Mold growth on interior surfaces

Post-Storm Inspection Checklist

After any significant storm, inspect for:

• New debris on roof surface
• Visible membrane damage from hail or wind
• Displaced or damaged flashings
• Blocked drains or scuppers
• Damage to rooftop equipment
• New ponding areas

7. DIY vs Professional Commercial Roof Repair

While minor residential roof repairs might be DIY-friendly, commercial roofs require professional expertise. Here's why:

Why Commercial Roofs Need Professionals

• Safety risks: Flat commercial roofs present fall hazards, especially around edges and during wet conditions. Professional crews use proper safety equipment and OSHA-compliant procedures.
• Specialized materials: Commercial roofing materials require specific application techniques, tools, and conditions. TPO requires heat welding equipment; EPDM needs proper primers and adhesives.
• Warranty implications: DIY repairs typically void manufacturer warranties. Certified contractors maintain warranty coverage.
• Hidden damage: Leaks often originate far from where water appears. Professionals trace problems to their source rather than just patching visible symptoms.
• Code compliance: Commercial building codes have specific requirements. Professional repairs ensure compliance.
• Insurance requirements: Your commercial property insurance may require licensed contractors for roof work.

What Building Managers Can Do

While repairs require professionals, you can:

• Clear debris from roof drains and scuppers
• Remove accumulated leaves and branches
• Document damage with photos for contractors and insurance
• Schedule regular professional inspections
• Maintain HVAC equipment to prevent leaks

8. How to Choose a Commercial Roofing Contractor

Selecting the right contractor is crucial for quality repairs and long-term roof performance. Here's what to look for:

Essential Requirements

• NJ State License: Verify current NJ Home Improvement Contractor registration with the Division of Consumer Affairs
• Insurance: Minimum $2 million general liability and workers' compensation coverage
• Commercial experience: At least 10 years specifically with commercial roofing (not just residential)
• Manufacturer certifications: GAF Master Elite, Firestone Master Contractor, or equivalent certifications for your roof type
• References: Request 3+ commercial references in your area, preferably similar building types

Red Flags to Avoid

• No physical business address (PO Box only)
• Cash-only payment requests
• Pressure tactics or "today only" pricing
• No written estimates or contracts
• Unable to provide insurance certificates
• Demands full payment upfront
• No references or poor reviews

Questions to Ask Before Hiring

1. How long have you been doing commercial roofing specifically?
2. What roof systems do you specialize in?
3. Can you provide commercial references in Essex County?
4. What warranties do you offer on repairs?
5. How do you handle unexpected issues discovered during repairs?
6. Do you provide emergency services?
7. What is your typical response time for repairs?

Why Choose R&E Roofing

• 25+ years commercial roofing experience in Essex County
• GAF Master Elite certified (top 3% of contractors)
• OSHA safety certified crews
• BBB A+ rated
• 24/7 emergency service
• Free inspections and transparent pricing
• Manufacturer-backed warranties
• Local team serving all 22 Essex County towns

For detailed guidance on evaluating contractors, see our guide to finding commercial roof repair companies near you.

9. Commercial Roof Repair FAQs

Protect Your Business Investment

Commercial roof repair doesn't have to be stressful. With the right knowledge and a qualified contractor, you can address problems quickly, minimize business disruption, and protect your property for years to come.

R&E Roofing has served Essex County businesses for over 25 years, delivering quality commercial roof repairs that stand the test of time. Our GAF Master Elite certification places us among the top 3% of roofing contractors nationwide, and our commitment to transparent pricing and exceptional service has earned us hundreds of satisfied commercial clients.

Whether you need emergency leak repair, routine maintenance, or a full roof assessment, we're here to help. Contact us today for a free inspection and detailed repair estimate.