Certified Commercial Roof Replacement Contractor
When your commercial roof has reached the end of its service life, investing in a quality replacement protects your building, your tenants, and your bottom line for decades to come. Mimar Construction has been installing commercial roofing systems throughout Northern New Jersey and Connecticut for 30 years, and our manufacturer certifications from Firestone and GenFlex mean your new roof comes with industry-leading warranty protection.
We work with building owners, property managers, and facility directors to select the right roofing system for each building's unique requirements. Whether you operate a retail plaza in Short Hills, a medical office in Darien, or an industrial facility in Montclair, we tailor our approach to your building type, budget, and long-term goals.
Commercial Roofing Systems We Install
- EPDM (Ethylene Propylene Diene Monomer): A proven single-ply rubber membrane known for exceptional durability and weather resistance. EPDM is one of the most cost-effective and longest-lasting flat roofing options, with a typical lifespan of 25-30+ years. Ideal for large commercial buildings where value and performance matter. We are certified to install Firestone EPDM systems.
- TPO (Thermoplastic Polyolefin): A heat-welded single-ply membrane that offers excellent energy efficiency with its reflective white surface. TPO reduces cooling costs and meets Energy Star requirements. Well-suited for office buildings, retail centers, and any property where energy savings are a priority. Expected lifespan of 20-30 years.
- PVC (Polyvinyl Chloride): The most chemically resistant single-ply membrane, making PVC ideal for buildings exposed to grease, oils, or chemical fumes — such as restaurants, manufacturing facilities, and laboratories. Heat-welded seams create the strongest bonds in the industry. Lifespan of 25-30+ years.
- Modified Bitumen: A multi-layered asphalt-based system that combines traditional built-up roofing durability with modern polymer technology. Available in torch-applied, cold-applied, and self-adhered options. Excellent for buildings that need robust protection against foot traffic and mechanical equipment. Lifespan of 20-25 years.
Our Commercial Roof Replacement Process
- Comprehensive Assessment: We perform a detailed inspection including core samples (when needed) to evaluate existing insulation, deck condition, and moisture levels. This determines whether a tear-off or recover is appropriate.
- System Recommendation: Based on your building type, usage, budget, and long-term plans, we recommend the optimal roofing system. We present options with honest pros and cons — never a one-size-fits-all approach.
- Detailed Proposal: You receive a comprehensive written proposal with material specifications, warranty options, project timeline, and transparent pricing.
- Phased Installation: We plan the installation to minimize disruption to your operations. For occupied buildings, we can phase the work in sections, schedule work during off-hours, and maintain weather-tight conditions throughout.
- Quality Assurance & Warranty: Every installation is inspected for manufacturer compliance. As a Firestone and GenFlex certified contractor, we can offer full system warranties backed by the manufacturer — not just our company.
Commercial Roof Replacement Projects
Frequently Asked Questions
The right system depends on several factors: your building's use (restaurant vs. office vs. warehouse), structural capacity, energy efficiency goals, budget, and how long you plan to own the property. EPDM is the most economical for large, simple roof areas. TPO is best for energy savings. PVC is ideal for buildings with chemical exposure. Modified bitumen works well for roofs with heavy foot traffic or mechanical equipment. During our consultation, we evaluate all these factors and present the best options with a clear comparison of costs, benefits, and expected lifespan for your specific situation.
With proper installation and regular maintenance, most commercial roofing systems last 20-30+ years. EPDM and PVC can exceed 30 years. TPO typically lasts 20-30 years. Modified bitumen averages 20-25 years. The key factors affecting lifespan are installation quality, proper drainage design, regular maintenance, and environmental conditions. As a certified installer for Firestone and GenFlex, our installations meet or exceed manufacturer specifications, which is essential for both performance and warranty coverage. We also offer maintenance programs to maximize your roof's lifespan.
We plan every commercial roof replacement to minimize disruption. Our approach includes: phased installation (completing one section at a time while keeping the rest weather-tight), noise-sensitive scheduling during off-peak hours when possible, clear daily communication about what to expect, dust and debris containment measures, and safe pedestrian access routes around the work area. For most commercial properties, business can continue operating normally throughout the project. We have extensive experience working on occupied retail, office, medical, and industrial buildings.
As a Firestone and GenFlex certified installer, we can offer manufacturer-backed system warranties that cover both materials and workmanship. These warranties range from 10 to 30 years depending on the system selected and warranty level chosen. A manufacturer system warranty is significantly more valuable than a contractor-only warranty because it remains in effect even if the installing contractor goes out of business. We walk you through all warranty options during the proposal phase so you can make an informed decision about the level of protection that fits your needs.
This depends on the condition of the existing roof assembly. If the existing insulation is dry and the deck is sound, a recover (installing over the existing roof) can save significant money by eliminating tear-off and disposal costs. However, if there is trapped moisture, deteriorated insulation, or deck damage, a full tear-off is necessary to ensure the new system performs properly. Building codes also limit the number of roof layers allowed, typically to two. We take core samples during our inspection to determine moisture levels and insulation condition, giving you an honest recommendation based on data — not guesswork.
"Mimar replaced the TPO roof on our 15,000 sq ft office building and the process was seamless. They phased the work so our tenants were never disrupted, and the Firestone warranty gives us real peace of mind. Their price was competitive, but what really set them apart was their honesty and communication throughout the project."
Commercial Roof Replacement Service Areas
We provide commercial roof replacement services throughout Northern New Jersey and Connecticut, including: