Commercial Roof Repair in Mount Prospect and the Northwest Chicago Suburbs

Find the Source of the Problem and Protect Your Commercial Property

A commercial roof leak can disrupt operations, damage insulation and interior finishes, threaten inventory or equipment, and create concerns for employees, tenants, and customers. Timely repair matters but stopping the visible water is only part of the job. A dependable repair begins by locating where moisture is entering the roofing system and understanding why the failure occurred.

Peterson Roofing provides commercial roof repair for TPO, EPDM, modified bitumen, and other flat and low-slope roofing systems. We serve offices, warehouses, retail centers, light industrial buildings, churches, schools, associations, multi-tenant properties, and other commercial facilities throughout Mount Prospect and the Northwest Chicago suburbs.

Our commercial repair technicians evaluate the affected area, surrounding roof condition, flashing, seams, penetrations, drainage, and previous repairs before recommending a solution. Peterson Roofing has served Chicagoland property owners since 1978 and is fully licensed, bonded, and insured.

Commercial Roofing Contractor Mount Prospect IL

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Diagram showing how water can travel through a commercial roof before appearing as an interior leak

Commercial Roof Repair Starts With Finding the Leak

The interior location of a leak does not always reveal where water entered the roof. Moisture can travel along the roof deck, insulation, structural components, or mechanical lines before appearing inside, so a ceiling stain may be several feet from the actual problem.

Peterson Roofing begins by reviewing when and where the leak appears, the roof’s type, age, and repair history, and any visible interior damage. We then evaluate the surrounding membrane, seams, flashing, penetrations, roof edges, drainage components, rooftop equipment, previous patches, and areas affected by weather or rooftop traffic.

Because moisture can also originate from HVAC equipment, condensation, plumbing, masonry, or wall transitions, identifying the likely source helps prevent repairing the wrong area while the underlying problem continues.

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Legal Name: Peterson Roofing, Inc.
Commercial/Residential Roofing Services
Year founded, 1978
Tax ID #36-3234016
IL Roofing License #104-002674

Affiliations
Member Chicago Roofing Contractors Association
Midwest Roofing Contractors Association
Better Business Bureau

Contact Peterson Roofing
Office Hours: Mon – Fri 7 a.m. to 4 p.m.
Phone (847) 590-5290
Fax (847) 590-5621

Business Operations and Warehouse
Peterson Roofing, Inc.
603 E. Kensington Rd.
Mount Prospect, IL 60056

Commercial Roofing Problems We Repair

Commercial roofs contain large membrane areas along with seams, edges, penetrations, drains, equipment curbs, and transition points. Any of these areas can become vulnerable because of age, weather exposure, movement, installation details, rooftop traffic, or damage from other contractors.

Peterson Roofing evaluates and repairs problems such as punctured or torn membranes, separated seams, deteriorated flashing, damaged roof edges, loose coping, failed sealants, problems around penetrations, storm-related damage, and localized drainage concerns. We also assess unsuccessful or incompatible previous repairs that may no longer be protecting the roof.

The appropriate repair depends on more than the visible size of the damaged area. The surrounding membrane must be suitable for repair, the new materials must be compatible with the existing system, and any underlying moisture or deterioration must be considered before work begins.

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Flat and Low-Slope Roof Systems We Repair

Peterson Roofing repairs TPO, EPDM, modified bitumen, and other flat and low-slope commercial roofing systems. Because each material requires compatible products and repair methods, we evaluate the existing membrane, surrounding roof condition, and source of the damage before recommending the appropriate solution.

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TPO Roof Repair

TPO is a thermoplastic single-ply membrane commonly installed on commercial flat and low-slope roofs. TPO repairs may involve punctures, cuts, open or damaged seams, flashing failures, penetrations, roof edges, or areas affected by equipment work and rooftop traffic.

A TPO repair requires appropriate preparation and compatible materials. Depending on the existing system and damage, repair materials may be heat-welded to restore continuity in the affected section.

EPDM is a flexible synthetic rubber roofing membrane used on many commercial buildings throughout Chicagoland. Common repair concerns include punctures, shrinking or stressed membrane, failing seams, deteriorated flashing, damaged cover tape, and problems around pipes, drains, curbs, or roof edges.

EPDM repairs require products and preparation methods that are compatible with the existing membrane. The surrounding roof condition and any trapped moisture must also be considered before determining the appropriate repair scope.

Modified bitumen is an asphalt-based membrane reinforced and modified for added flexibility and durability. It is available in several application types and surface finishes, including granulated membranes.

Modified bitumen may be appropriate for certain smaller commercial roofs, roof sections, or properties where the existing assembly and building requirements support its use. Peterson Roofing evaluates the complete roof before recommending modified bitumen or a single-ply alternative.

Many commercial roof leaks begin at details rather than in the open field of the membrane. Walls, parapets, curbs, pipes, vents, drains, expansion joints, roof edges, and equipment supports all create transitions that must remain watertight as the building and roofing materials move through seasonal temperature changes.

Repairing these areas may require more than applying additional sealant. Peterson Roofing evaluates the complete detail to determine why it failed and whether flashing, membrane, metal, fasteners, sealant, or another component needs corrective work.

Our Commercial Roof Repair Process

Step 1

Discuss the Leak and Building Conditions

We begin by gathering information about the property, roof system, leak location, weather conditions, repair history, and any recent work performed by HVAC technicians or other contractors. Photographs, roof plans, warranties, and previous repair records can provide useful background.

Step 2

Evaluate the Roof and Trace the Problem

Our technicians inspect the reported area along with nearby seams, flashing, penetrations, drainage components, equipment, and previous repairs. Because water can travel within a roof assembly, the investigation may extend beyond the area directly above the interior leak.

Step 3

Explain the Findings and Repair Options

Peterson Roofing explains the apparent source of the problem, the condition of the surrounding roof, and the recommended scope. If additional investigation or broader corrective work is needed, we will explain why.

Step 4

Plan and Complete the Repair

The repair is coordinated around roof access, weather, safety requirements, business operations, tenants, equipment, and sensitive interior areas. Existing materials are prepared, and compatible repair materials are installed according to the approved scope.

Step 5

Review the Completed Work

After the repair is completed, the work area is reviewed. When appropriate, Peterson Roofing may also identify maintenance concerns or other roof areas that should be monitored, repaired, or included in future planning.

When Is Commercial Roof Repair the Right Choice?

A targeted repair may be appropriate when the damage is localized, the surrounding membrane remains serviceable, and the problem can be corrected using compatible materials. Examples may include an isolated puncture, a limited open seam, damaged flashing, a localized perimeter problem, or a leak associated with a specific penetration.

Repair may also provide a practical way to extend the usable life of a roof while the owner monitors its condition or prepares for a larger future capital project.

A repair becomes less dependable when deterioration is widespread, insulation is wet across a larger area, leaks are recurring in multiple locations, seams or flashing are failing throughout the roof, or the system has reached the end of its practical service life. In those situations, continued patching may address individual symptoms without correcting the broader condition.

Peterson Roofing evaluates the complete roof before recommending repair, commercial roof maintenance, a roof coating, or commercial roof replacement. Learn more about commercial roof repair versus replacement.

Comparison of localized commercial roof damage suitable for repair and widespread deterioration requiring broader evaluation
Commercial roof repairs coordinated around building deliveries and normal employee access

Planning Roof Repairs Around Your Operations

Commercial roof repairs are frequently completed while the building remains occupied and operational. Before work begins, Peterson Roofing considers roof access, equipment placement, material staging, noise, interior protection, employee or tenant access, and changing weather conditions.

Building owners and property managers should identify sensitive interior areas, critical operating hours, loading zones, production schedules, tenant requirements, and any equipment that cannot be interrupted. Sharing this information early helps the roofing team plan the repair around the property’s priorities.

Although some noise or temporary access limitations may be unavoidable, careful coordination can help protect employees, customers, tenants, inventory, equipment, and normal building access.

Contact Us

Legal Name: Peterson Roofing, Inc.
Commercial/Residential Roofing Services
Year founded, 1978
Tax ID #36-3234016
IL Roofing License #104-002674

Affiliations
Member Chicago Roofing Contractors Association
Midwest Roofing Contractors Association
Better Business Bureau

Contact Peterson Roofing
Office Hours: Mon – Fri 7 a.m. to 4 p.m.
Phone (847) 590-5290
Fax (847) 590-5621

Business Operations and Warehouse
Peterson Roofing, Inc.
603 E. Kensington Rd.
Mount Prospect, IL 60056

Before and After a Commercial Roof Repair

You do not need to diagnose the problem before contacting Peterson Roofing. Information about where and when the leak appears, the weather conditions that trigger it, the roof’s approximate age and material, previous repairs, recent rooftop work, operating hours, and available roof records can help our team prepare for the evaluation. Interior photographs may also be submitted through the request form, but building personnel should not climb onto the roof unless they are trained and properly equipped.

After the repair, keep the proposal, completion details, photographs, warranty documents, inspection reports, and notes about the original leak in the building’s roof file. Good documentation makes it easier to recognize recurring problems and plan future maintenance or capital work.

Repairing the immediate issue does not eliminate the need to monitor the rest of the roof. The National Roofing Contractors Association recommends roof inspections twice each year and after severe weather. Scheduled commercial roof maintenance can help identify developing seam, flashing, drainage, or membrane problems before another interior leak occurs.

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Call (847) 590-5290 Today →

Local Commercial Roofing Experience Since 1978

Peterson Roofing has served Mount Prospect, Elk Grove Village, Itasca, Schaumburg, Arlington Heights, Palatine, Des Plaines, Rolling Meadows, Wheeling, Northbrook, Deerfield, Barrington, and surrounding Chicagoland communities since 1978.

Our commercial work is supported by dedicated repair technicians, trained crews, continuing safety and installation education, and experience with TPO, EPDM, modified bitumen, flashing, drainage components, and other flat and low-slope roofing details.

Property owners and managers rely on Peterson Roofing for clear evaluations, practical repair recommendations, compatible materials, and planning that considers occupied and operating buildings. Peterson Roofing is fully licensed, bonded, and insured and holds Illinois roofing license #104-002674.

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Commercial Roof Repair Frequently Asked Questions

Can a leaking commercial flat roof be repaired?

Many commercial roof leaks can be repaired when the damage is localized and the surrounding roofing system remains in serviceable condition. Repairability depends on the membrane, roof age, moisture conditions, extent of deterioration, previous repairs, and the source of the leak. An evaluation is needed before determining whether a targeted repair will provide a dependable solution.

The investigation may begin with the interior leak location and information about when the water appears. On the roof, technicians evaluate the surrounding membrane, seams, flashing, penetrations, drains, edges, equipment, and previous repairs. Because water can travel within the roof assembly, the entry point may not be directly above the visible ceiling stain.

Peterson Roofing primarily repairs TPO, EPDM, modified bitumen, and other flat and low-slope commercial roofing systems. We also repair related flashing, penetrations, roof edges, coping, drains, scuppers, and other details when they are part of the identified roofing problem.

No. An isolated leak may result from a puncture, open seam, damaged flashing, or another localized condition that can be repaired. Replacement becomes more likely when leaks recur in several areas, deterioration is widespread, insulation is extensively wet, previous repairs are failing, or the roof has reached the end of its practical service life.

Many repairs can be completed while a commercial building remains occupied. The answer depends on roof access, repair location, equipment, safety requirements, noise, interior sensitivity, and business operations. Peterson Roofing coordinates the work with the owner or property manager to reduce avoidable disruption.

Cost depends on the roof system, source and extent of the damage, repair materials, accessibility, flashing or perimeter details, moisture conditions, rooftop equipment, safety requirements, and whether previous repairs must be removed or corrected. An on-site evaluation is generally required to develop a project-specific repair proposal.

Schedule routine roof evaluations, keep drains and scuppers clear, document repairs, monitor known problem areas, control access to the roof, and inspect areas affected by HVAC or other rooftop work. Roofs should also be checked after severe weather. A preventive maintenance program can help identify developing problems before they cause interior leakage.

Address a Commercial Roof Leak Before the Damage Spreads

Water entering a commercial building can affect insulation, ceilings, inventory, equipment, and occupied areas. The sooner the source is evaluated, the better the opportunity to contain the problem and determine whether a focused repair can restore the affected section.

Tell Peterson Roofing where the leak is appearing, when you first noticed it, and whether it changes during heavy rain, wind, or melting snow. Our commercial repair technicians will investigate the likely entry point, examine the surrounding roof condition, and recommend work based on what is actually causing the problem—not simply where the water becomes visible indoors.

Peterson Roofing provides commercial roof leak repair throughout Mount Prospect and the Northwest Chicago suburbs.

Call (847) 590-5290

Schedule a Commercial Roof Repair Evaluation

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