JJM Roofing & Waterproofing: Your Trusted Westbury NY Contractor for Roofs and Foundations

JJM Roofing & Waterproofing Photos

JJM Roofing & Waterproofing Introduce

For decades, residents and businesses across New York—including Long Island and the five boroughs—have faced the challenge of protecting their properties from unpredictable weather, from heavy snow and rain to the damaging winds of Nor’easters. In this environment, a dependable roofing contractor that specializes not just in covering structures but in complete moisture protection is essential.

JJM Roofing & Waterproofing, based in Westbury, NY, represents a gold standard in this field. This is not a fly-by-night operation; it is a reputable, family-owned company with roots in the roofing business dating back to 1955. Now led by owner Dennis Cohen, the company brings extensive generational knowledge and on-site experience—including managing large, multi-million dollar commercial projects for major New York entities—directly to your home or business.

JJM Roofing & Waterproofing operates on a foundational principle of making customer service their absolute top priority. This commitment is evident in their rapid responsiveness, especially to urgent matters like post-storm damage. Customers consistently praise the owner and his professional team members, such as Ray and Carlos, for being incredibly easy to work with, knowledgeable, and true to their word. From the initial Free Estimate and prompt on-site assessment (often within 24 hours) to meticulous cleanup, they deliver a highly personalized and efficient Roofing Process. They are true specialists in all facets of exterior protection, offering solutions that range from traditional Shingle Roofing to advanced Commercial Roofing Solutions and critical Foundation Waterproofing.

A key differentiator for JJM is their integrated approach: they are not just roofers, but also experts in Waterproofing Solutions and siding. They recognize that a leak in the attic or a wet basement often points to a larger moisture issue that requires a comprehensive repair strategy. This dual expertise in Residential & Commercial Roofing Replacing and robust waterproofing systems ensures a complete seal for your property, providing the maximum possible defense against water damage, which is a common and costly problem in the New York region.

The company is also highly experienced in handling insurance claims, which is invaluable for homeowners dealing with unexpected Storm Damage. Their ability to quickly assess the issue, such as a roof leak caused by recent winds, and dispatch a professional crew—often with the necessary materials in hand—sets a high bar for reliability and minimizes the stress for the property owner. This proactive, professional service makes JJM a standout choice for long-lasting protection.

Location and Accessibility

Strategically located in Westbury, JJM Roofing & Waterproofing is ideally positioned to serve the vast metropolitan area, including Nassau County, Suffolk County, and all five boroughs of New New York City. Their central location allows for an efficient deployment of teams, ensuring prompt service where and when it is needed most.

Address: 1025 Old Country Rd Suite 403 W, Westbury, NY 11590, USA
Accessibility: The office is located right on Old Country Road, a major thoroughfare in Long Island. They also offer onsite services, meaning their professional team will travel to your location to provide personalized attention. For client convenience, the location also features a Wheelchair Accessible Parking Lot.

Services Offered

JJM Roofing & Waterproofing offers a comprehensive suite of services that cover the entire exterior and foundation of residential and commercial structures. Their service range is broad, reflecting their deep expertise as a full-service Contractor and Roofing specialists.

Residential and Commercial Roofing: Full Roof Replacement, Roof Installation, Roof Repair, and Roof Maintenance for Entire Roofing systems. This includes Residential & Commercial Roofing Replacing.
Specialized Roofing Types: Expertise in Flat Roofs (including Tpo/Pvc Roofs and Flat roof repair), Metal Roofing, Shingle roofing (including Fiberglass Shingles and Wood Shingles), Composite Roofing, Slate Roofs, and Tile Roofing.
Water and Leak Protection: Critical services like Emergency leak repair, Roof leak repair, Flat roof waterproofing, Roof waterproofing membranes, Commercial waterproofing, and advanced Leak detection.
Structural Moisture Management: Comprehensive Waterproofing services including Basement Waterproofing, Exterior Waterproofing, and Foundation Waterproofing and Foundation Repair to resolve Moisture Issues.
Storm and Emergency Services: Prompt Emergency Service Call and Emergency roof repair, specializing in Roof repair for storm & wind damage and Storm damage repair, as well as assistance with Insurance Claims.
Gutters, Vents, and Siding: Complete Gutter installation, Gutter repairs, Custom Gutters (including Copper Gutters and Commercial Gutters), Attic venting, Attic insulation, Residential Siding (including Vinyl Siding), and Siding Work.

Features / Highlights

The unique selling points of JJM Roofing & Waterproofing are rooted in their long-standing history and dedication to professional integrity, providing a level of service that modern New York homeowners expect and deserve.

Generational Expertise Since 1955: The company’s long history instills confidence, showing a proven ability to adapt and deliver top-quality results over nearly seven decades, working on projects both large and small across the region.
Owner-Operated Accessibility: As a family-owned business, clients benefit from direct access to the owner, Dennis Cohen, who ensures a hands-on approach and ultra-quick, personal response, as validated by numerous customer reviews praising his immediate follow-up.
Specialization in Integrated Protection: Unlike standard roofing companies, their expertise extends to Waterproofing the entire structure—from the roof surface down to the foundation—addressing the full spectrum of water and moisture issues.
Expert Storm Damage Response: They are specialists in Repair Storm and handling the stressful process of Roof repair for storm & wind damage, often providing immediate temporary solutions and working with property owners through the Insurance Claims process.
Advanced Technology and Materials: The company utilizes a drone for roof inspections and offers innovative solutions like Roof coating and Green Roofing Options, ensuring they use the highest quality materials and offer full lifetime manufacturer warranties on all New Roofing.
High Standard of Professionalism: Team members like Carlos are noted for their professional demeanor, providing clear explanations of the work done and maintaining a clean, respectful work environment throughout the project.

Contact Information

If you are in the New York area and require expert Roofing Construction, waterproofing, or siding services, you can contact JJM Roofing & Waterproofing using the details below to schedule your consultation and obtain a Free Estimate.

Address: 1025 Old Country Rd Suite 403 W, Westbury, NY 11590, USA
Phone: (516) 508-3781
Mobile Phone: +1 516-508-3781

What Is Worth Choosing

In a market saturated with contractors, the decision of who to trust with your roof—your home’s first line of defense—comes down to confidence and proven reliability. JJM Roofing & Waterproofing offers both, backed by a history that spans more than half a century in the New York region.

What is worth choosing here is the peace of mind that comes from selecting a contractor with unparalleled experience in Residential And Commercial Roofing as well as Waterproofing. Their ability to provide a Comprehensive Repair that addresses everything from a missing shingle after high winds to complex foundation leaks is their strongest asset. You are not hiring a company that will simply patch a problem; you are hiring a team that seeks to provide a permanent, engineered solution with a strong focus on quality Roofing Design & Construction.

The testimonials highlight the exemplary service of individuals like Dennis, who personally ensures a quick and knowledgeable response to emergency calls, which is a rare and valuable trait in the contracting world. As one satisfied customer noted after a wind damage incident, "Dennis was ultra quick and responsive and Carlos was a true professional and made sure everything was done. He explained everything he did which made me very confident in my decision of calling them and I greatly appreciated it." This level of detailed attention, transparency, and high-quality execution—from Skylight installation to Basement Waterproofing—makes JJM Roofing & Waterproofing the smart choice for any New Yorker prioritizing the long-term protection of their property.

JJM Roofing & Waterproofing Services

Roofing Contractor
Attic venting
Gutter installation
Properly installed gutters are essential to protecting your home from water damage. Our team will work with you to design and install the perfect gutter system for your home, ensuring water is properly diverted away from your foundation and landscaping.
Gutter repairs
Damaged or clogged gutters can cause serious damage to your home's foundation and landscaping. Our gutter repair team will quickly and effectively fix any issues with your gutters to protect your home and prevent further damage.
Roof inspection
Regular roof inspections are crucial to catch small issues before they become costly problems. Our team will thoroughly inspect your roof for any signs of damage or wear and provide a detailed report of our findings. We'll work with you to address any issues and keep your roof in top condition.
Roof installation
Whether you're building a new home or need a new roof for your existing home, our team can handle the installation with ease. We'll work with you to choose the best materials and ensure the installation is done right the first time.
Roof repair
Don't let a small leak turn into a big problem. Our roof repair experts can quickly identify and fix any issues with your roof to prevent further damage. We'll work efficiently to get your roof back to its best condition.
Roof repair for storm & wind damage
Storms can cause serious damage to your roof and home. Our storm damage repair team will quickly assess any damage and provide a comprehensive repair plan to get your home back to its pre-storm condition. We'll work with your insurance company to ensure a smooth and stress-free repair process.
Skylight installation
Installing a skylight is a great way to add natural light and beauty to your home. Our team has the expertise to install skylights of any size or style, ensuring a seamless and leak-proof installation. We'll work with you to find the perfect skylight solution for your home.
Skylight repair
A damaged or leaking skylight can cause serious issues with your roof and home. Our skylight repair team will quickly identify and fix any issues with your skylight to prevent further damage and improve the energy efficiency of your home.
Attic insulation
Proper attic insulation can greatly improve the energy efficiency of your home and lower your energy bills. Our team uses only the highest quality insulation materials and installation techniques to ensure your home is properly insulated.
Basement Waterproofing
Chimney repair
Chimneys are a vulnerable part of your roof that can be prone to damage and wear. Our chimney repair team will quickly identify any issues and provide a detailed repair plan. We use only the highest quality materials to ensure your chimney is properly sealed and functioning correctly.
Commercial Buildings
Commercial Gutters
Commercial Roofing And Siding
Commercial Roofing Project
Commercial Roofing Solutions
Our commercial roofing solutions are designed to meet the unique needs of your business. We offer a range of roofing options, including TPO, PVC, and metal roofs, to ensure your property is fully protected and energy-efficient. Our team has the expertise to handle any commercial roofing project with
Commercial Roofing Work
Commercial roofing
Our team has the expertise to handle any commercial roofing project, from repairs to replacements. We understand the unique challenges that come with commercial roofs and use only the highest quality materials to ensure your roof can withstand the toughest conditions.
Commercial waterproofing
We offer commercial waterproofing to prevent water damage and leaks. Our specialized materials and techniques create a barrier to stop water from penetrating your building's roof or walls. We can waterproof any type of commercial building for complete protection.
Composite Roofing
Composite roofing is a durable and affordable option for any commercial property. Our team has the expertise to install, repair, and maintain composite roofs of any size or style. We use only the highest quality materials and techniques to ensure a long-lasting, functional result.
Comprehensive Repair
Copper Gutters
Copper gutters are a beautiful and functional option for any commercial property. Our team has the expertise to design and install a customized copper gutter system that fits your building's unique needs. We use only the highest quality materials and techniques to ensure a fully functional.
Custom Gutters
Our custom gutter services are designed to meet the unique needs of your commercial property. We'll work with you to design a customized gutter system that fits your building's style and functionality needs. We use only the best materials and techniques to ensure a fully functional and long-lasting
Design & Construction
Emergency Service Call
Roofing emergencies can happen at any time, which is why we offer 24/7 emergency service calls. Our team will quickly respond to your roofing emergency and provide a solution that gets your roof back to a functional state. We use specialized materials and techniques to ensure a fast and effective re
Emergency leak repair
A leaking roof can't wait, and our emergency leak repair team is available 24/7 to quickly address any urgent roofing issues. We'll work efficiently and effectively to protect your property and minimize further damage.
Emergency roof repair
Don't wait for a roofing emergency to turn into a disaster. Our emergency repair team is available 24/7 to quickly address any urgent roofing issues. We'll work efficiently and effectively to protect your property and minimize further damage.
Entire Roofing
Our entire roofing services cover every aspect of your roof, from installation to repair and maintenance. Our team has the expertise to handle any roofing project, big or small, and use only the best materials and techniques to ensure a long-lasting and functional result.
Exterior Waterproofing
Fiberglass Shingles
Flat Roofs
Flat roof repair
Flat roofs require a specialized approach to repairs, and our team has the expertise to handle any issues that arise. We'll use the best materials and techniques to fix any leaks or damage and ensure your flat roof is in top condition.
Flat roof waterproofing
Flat roofs require a specialized approach to waterproofing, and our team has the expertise to get the job done right. We use only the highest quality materials and techniques to ensure your flat roof is fully protected from leaks and water damage.
Foundation Repair
Foundation Waterproofing
Free Estimate
Green Roofing Options
Our green roofing options are designed to provide an environmentally-friendly and sustainable solution for your property. We use specialized materials and techniques to create a living roof that provides insulation, improves air quality, and reduces your carbon footprint.
Gutter Work
Install Or Replace
Insurance Claims
Leak detection
Our leak detection services are designed to quickly and accurately identify any leaks in your roof. We use state-of-the-art equipment and techniques to pinpoint the source of the leak and provide a comprehensive repair solution.
Metal Roofs
Metal roof waterproofing
Metal roofs are a durable and long-lasting option for any building, but they require specialized waterproofing solutions. Our team has the expertise to waterproof metal roofs of any size or style, ensuring your property is fully protected from leaks and water damage.
Metal roofing
Metal roofing is a durable and energy-efficient option for any home or business. Our team has the expertise to install, repair, and maintain metal roofs of any size or style. We'll work with you to find the perfect metal roofing solution for your needs and budget.
Moisture Issues
New Roofing
Personalized Roofing
Our personalized roofing services are designed to meet the unique needs and style of your property. We'll work with you to design a customized roof that fits your aesthetic and functionality needs. Our team uses only the best materials and techniques to ensure a long-lasting and stunning result.
Repair Or Replace
Repair Storm
Residential & Commercial Roofing Replacing
Residential And Commercial Roofing
Residential Or Commercial Roofing
Residential Siding
Residential roofing
We take pride in protecting your home and family with our residential roofing services. From repairs to installations, we use only the best materials to ensure your roof is built to last. We'll work closely with you to find the perfect roofing solution for your needs and budget.
Roof coating
A roof coating can greatly extend the life of your roof and improve its energy efficiency. Our team uses high-quality roof coatings to protect your roof from the elements and prevent leaks. We'll work with you to find the perfect coating solution for your roof type and condition.
Roof drainage systems
Proper roof drainage is essential to preventing water damage and leaks. Our team has the expertise to design and install a customized roof drainage system that ensures water is properly diverted away from your property. We use the highest quality materials to ensure your roof is fully protected.
Roof flashing repair
Flashing is a vulnerable part of your roof that can be prone to leaks and damage. Our roof flashing repair experts will quickly identify any issues and provide a detailed repair solution to ensure your roof is fully protected.
Roof leak repair
A leaking roof can cause serious damage to your home's structure and interior. Our team will quickly identify and fix any leaks to prevent further damage and ensure your home is protected. We use only the best materials and techniques to ensure a long-lasting repair.
Roof maintenance
Regular maintenance is key to ensuring your roof lasts for years to come. Our team will perform routine inspections and maintenance to keep your roof in top condition, preventing costly repairs down the line.
Roof renovation
Transform your roof with our renovation services that combine style and functionality. We'll work with you to design a customized plan that fits your budget, using the best materials and techniques for a stunning result. Upgrade the look of your home or business with our expert team.
Roof repair contractors
Our experienced roof repair contractors are equipped to fix any roofing issues with speed and efficiency. We use high-quality materials and techniques to ensure your roof is fully functional and protected. Find a repair solution that meets your needs and budget with our team.
Roof replacement
If your roof has reached the end of its life, we can replace it with a new, durable roof. We'll help you choose the best material for your needs and budget and complete the installation with precision and care.
Roof restoration
Restore your worn or damaged roof with our comprehensive restoration services. We'll identify issues and use high-quality materials and techniques to improve its condition and extend its life. Enjoy a long-lasting restoration you can trust.
Roof sealing
Proper roof sealing is essential to preventing leaks and water damage. Our team uses only the best materials and techniques to seal your roof, ensuring it's fully protected from the elements. We'll work with you to find the perfect sealing solution for your needs and budget.
Roof waterproofing membranes
Roofing & Construction
Roofing And Siding
Our roofing and siding services cover every aspect of your property's exterior. From installation to repair and maintenance, our team has the expertise to ensure a fully functional and beautiful exterior. We use only the best materials and techniques to ensure a long-lasting result.
Roofing Construction
Our roofing construction services are designed to provide a comprehensive solution for your roofing needs. From design to construction, our team has the expertise to create a beautiful and functional roof that lasts for years to come.
Roofing Design & Construction
Our roofing design and construction services are designed to meet the unique needs of your property. From the initial design to the final construction, our team has the expertise to create a beautiful and functional roof that stands the test of time. We use only the best materials and techniques to
Roofing Process
Roofing Replacing
Roofing Replacing Or Repairing
Roofing Siding
Roofing services
Our roofing services include everything from repairs to installations. We have a team of experienced professionals who can handle any roofing project, big or small. We use only the highest quality materials to ensure your roof lasts for years to come.
Roofing specialists
We're more than just a roofing company – we're roofing specialists. Our team has the expertise and experience to handle any roofing project, big or small. From repairs to installations, we use only the best materials and techniques to ensure your roof is built to last.
Shingle roofing
Shingle roofing is a popular and affordable option for residential roofs. Our team uses only the highest quality shingles and installation techniques to ensure your roof is both durable and aesthetically pleasing. We'll work with you to find the perfect shingle roofing solution for your home.
Siding Work
Site Design
Slate Roofs
Slate roofs are a beautiful and durable option for any home. Our team has the expertise to install, repair, and maintain slate roofs of any size or style. We use only the highest quality slate and installation techniques to ensure a long-lasting, stunning result.
Storm Damage
Storm damage repair
Storms can cause serious damage to your roof and home. Our storm damage repair team will quickly assess any damage and provide a comprehensive repair plan to get your home back to its pre-storm condition. We'll work with your insurance company to ensure a smooth and stress-free repair process.
Tile Roofing
Tpo/Pvc Roofs
Vinyl Siding
Waterproofing
Our waterproofing services are designed to protect your roof from water damage and leaks. We use specialized materials and techniques to create a barrier that prevents water from penetrating your roof. Our team has the expertise to waterproof any type of roof, ensuring your property is fully protect
Waterproofing Solutions
Wood Shingles

JJM Roofing & Waterproofing Details

Service options
Onsite services

Accessibility
Wheelchair accessible parking lot

JJM Roofing & Waterproofing Location

JJM Roofing & Waterproofing

New York Nassau County Westbury Old Country Road

1025 Old Country Rd Suite 403 W, Westbury, NY 11590, USA

JJM Roofing & Waterproofing Reviews

An average rating of ★4.9 from 84 user reviews.

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★ 5★ 4★ 3★ 2★ 1

5 star review hands down. Both Dennis and Ray were easy to work with. They know the job, answered all of my questions. Very professional from their work attire to the way they conduct themselves professionally. My wife and I can not say thank you enough. What a pleasure. Thanks again.
Jul 09, 2024 · Rob Zdziebko
With all the crazy winds recently my roof had 3 shingles I found on my front lawn. Went into the attic and saw light coming in. JJM roofing was referred to me by a friend of mine so I gave them a call on Sunday.Dennis picked up the phone and I told him my issue and he knew right away what it was and said he can have someone out to me on Monday the next day. His employee Carlos came to my house and I showed him the missing shingles and the spot on the roof where I saw light in my attic. He was able to bring the same type of shingles that I text to Dennis the day before. Carlos made the repair and also checked the rest of the roof to make sure no other issues.Dennis was ultra quick and responsive and Carlos was a true professional and made sure everything was done. He explained everything he did which made me very confident in my decision of calling them and I greatly appreciated it.Would highly recommend JJM!!!!!
Mar 10, 2025 · Michael Genduso
Had a gutter detach from my house and called JJM. Dennis came out that day to see what was going on and sent his worker first thing the next day to resolve the issue. They were prompt and fair with pricing. Would definitely work with them again.
Jun 10, 2025 · Julie Bardhoku
Dennis at JJ Roofing is the best! I was very concerned about potential repairs needing to be done to our roof (per an insurance inspection). Dennis and his foreman took the time to thoroughly inspect everything and educate my husband and I about the material of our roof and why certain areas looked the way that they did. After inspecting everything, we learned that everything was in great condition and not currently in need of repair. We are so grateful for Dennis' honesty and expertise and if/when we DO need work done on our roof, he will be our first and only call. Thank you Dennis!!
Nov 08, 2024 · Chelsea Schwiering
Best experience working with a contractor ever! Dennis was super professional, informative, and communicative throughout the entire process and an absolute pleasure to work with from start to finish. His proposal was professional and itemized all the work to be done, along with guarantees. He told us he'd be able to slot us in within 10 days, and sure enough, he reached out in 10 days to tell us he was ready to get started. Day of the work, his crew showed up on time and began work immediately. They were courteous and respectful of our property. They finished installing the roof in record time - I think because it was extremely hot out and so Dennis put on extra workers to get the job done as early in the day as possible. That's an employer that cares about his workers - which translates into happy workers who care about the work they do and a better experience for the buyer. When they were done, my property was spotless - completely debris free! And the new roof is beautiful. Finally I have a piece of roof that has a very shallow pitch; I've had very bad leaks and even a ceiling collapse in the room below from ice dams in the past. The solution Dennis offered was above and beyond anything anyone offered before, utilizing special materials and techniques that make me confident the problem is fixed once and for all. And, if all that was not enough - his pricing was great too. Again, an absolutely great experience and a pleasure to work with. Can't recommend JJM and Dennis more highly.
Jul 09, 2024 · Lori C