Since 1922, Big Rock Supply has been more than just a distributor of roofing materials. We have been a trusted partner in the roofing industry for over a century. As a family-owned business, our foundation has always been built on relationships, integrity, and a commitment to supporting the people behind the projects.
Partnerships are at the heart of how we operate. We don’t simply supply products; we collaborate with manufacturers who share our values, our dedication to quality, and our commitment to the roofing community. These relationships allow us to bring innovative, reliable, and proven solutions to our customers while also supporting the brands that make exceptional products possible.
Over the years, we have worked alongside industry-leading manufacturers, some for decades, and others more recently. We strive to continue expanding our product offerings and strengthen our role as a trusted resource for roofing professionals. The following partnerships reflect both our history and our future: long-standing collaborations built on trust, as well as exciting new relationships focused on innovation and growth.
Marathon Roofing Products: Honoring 60 Years of Legacy
Watch a testimonial from Marathon Roofing Products.
Marathon Roofing Products is a family-owned and operated business that is celebrating its 60th anniversary this year, an impressive milestone that reflects their commitment to quality, craftsmanship, and service. Marathon has been a long-time partner of Big Rock Supply, and over the years, we have developed a strong working relationship rooted in mutual respect and shared values.
Marathon is widely recognized for its high-quality roof drains, vents, and roofing accessories, but to us, they are more than just a manufacturer. They are a trusted partner whose team and family have consistently demonstrated dedication to the roofing industry. Working alongside Marathon has been both rewarding and inspiring, and we congratulate them on six decades of excellence. We look forward to many more years of collaboration, innovation, and shared success.
Some of Big Rock Supply’s best-selling Marathon Roofing Products include:
- Universal Mara-Boot: A versatile flashing solution designed to provide reliable waterproofing around roof penetrations.
- 5-inch Adjustable Drain Guard: Helps prevent debris buildup while maintaining proper water flow through roof drains.
- Aluminator Retrofit Drain: A durable retrofit solution that improves drainage performance on existing roof systems.
The BILCO Company: A Trusted Partner in Roof Safety
Watch a testimonial from The BILCO Company.
Safety has always been a cornerstone of Big Rock Supply’s mission. Working at height presents serious risks in the roofing industry, with statistics showing that falls from roofs and elevated surfaces are among the leading causes of injury on job sites. We recognize that safety is critical across all roofing work, whether residential or commercial, and we take the responsibility of providing contractors with reliable, well-engineered safety solutions seriously.
BILCO has been a long-standing partner in this mission, known as a trusted name in roof hatch safety. Their products, including roof hatches, hatch rails, and the Ladder-Up system for safe climbing and descending, allow contractors to access roofs safely and confidently. Through our partnership, Big Rock Supply can offer the roofing industry proven safety solutions that help reduce risk and protect workers while supporting efficient jobsite operations.
Some of Big Rock Supply’s best-selling BILCO Products include:
- Roof Hatches: Durable, weather-resistant hatches designed for safe rooftop access.
- Hatch Safety Rails: Sturdy rails that provide secure handholds when entering or exiting roof hatches.
- Ladder-Up System: Engineered for safe climbing and descending from roof hatches, reducing the risk of falls while improving workflow.
OMG Roofing Products: A Recognized Leader in Commercial Roofing
Watch a testimonial from OMG Roofing Products.
OMG Roofing Products has been a valued partner of Big Rock Supply for many years and is one of the most respected names in commercial roofing. As a leading global manufacturer, OMG specializes in high-performance fasteners, insulation adhesives, and retrofit drainage systems that are used across a wide range of commercial roofing applications.
Their product lines,including RhinoBond and OlyBond,are widely recognized for innovation, reliability, and efficiency. In fact, OMG products have been used in approximately 65% of all commercial, industrial, and institutional buildings constructed or reroofed in the U.S. over the past 25 years. This is just a single testament to their impact on the industry.
Our partnership with OMG has allowed Big Rock Supply to provide contractors with cutting-edge solutions that improve installation efficiency, performance, and long-term roof durability.
Some of Big Rock Supply’s best-selling OMG Roofing Products include:
- Olyvent 1-Way Vent: Designed to allow trapped moisture and air to escape from the roof system while preventing water infiltration.
- Olyflow U-Flow Hercules Retro-Drain with Cast Aluminum Dome: A high-performance retrofit drain that enhances water movement on existing roofs.
- RhinoBond Plates: Designed for the RhinoBond induction welding system, these plates secure insulation beneath the membrane without surface penetrations, enhancing wind uplift performance and reducing leak risk.
KARNAK Corporation: Performance with Purpose
Watch a testimonial from KARNAK.
Founded in 1933, KARNAK Corporation is another family-owned manufacturer that has played a significant role in shaping the roofing industry. They are known for producing sustainable, reflective roof coatings, high-performance sealants, and advanced waterproofing products designed to extend roof life and improve energy efficiency.
KARNAK has built a reputation not only for quality products, but also for education and technical support, frequently demonstrating their materials in real-world applications to help contractors understand best practices. Their commitment to innovation and environmental responsibility aligns closely with Big Rock Supply’s mission to bring meaningful solutions to our customers.
We are proud to partner with KARNAK and offer a strong selection of their products to our roofing community.
Some of Big Rock Supply’s best-selling KARNAK Products include:
838 Coatings: A New Chapter in Partnership
Watch a testimonial from 838 Coatings.
Our most recent partnership with 838 Coatings reflects Big Rock Supply’s ongoing commitment to innovation and expanded product options for our customers. 838 specializes in high-performance coatings, primers, and sealants that are designed to meet the evolving needs of modern roofing systems.
One of the standout products we have added to our lineup is the 838 MS Multi-Purpose Sealant. This product is a hybrid, moisture-cure elastomer that offers exceptional durability, flexibility, and versatility. Unlike many traditional sealants, the 838 MS is 100% solids, solvent-free, and isocyanate-free, making it safer and more environmentally friendly while still delivering superior performance.
This sealant is particularly well-suited for metal roofing details, where it excels at encapsulating seams and fastener heads with minimal sag and excellent vertical hold. It adheres to a wide variety of surfaces, including metal, asphalt, EPDM, PVC, aged TPO, concrete, and brick, therefore, making it a truly multi-functional solution.
One of its greatest advantages is that it can be applied in less-than-ideal weather conditions and still cures quickly, typically within 1–2 hours. This makes it a reliable choice for contractors working under tight deadlines or unpredictable jobsite conditions.
For our customers, the 838 MS Sealant represents a dependable, adaptable product that performs where it matters most: across seams, fasteners, gutters, and roof penetrations.
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Built Together: People, Products, and Partnerships
At Big Rock Supply, partnerships are about more than products, they are about people. As a family-owned business, we understand the value of relationships built on trust, collaboration, and shared goals. The manufacturers we represent are not just brands we carry, they are partners who share our commitment to supporting roofing professionals and bringing dependable solutions to the jobsite.
Together, we bring the best possible products to market while ensuring that contractors have the knowledge, support, and resources they need to use them effectively. Our partnerships allow us to remain deeply connected to the industry we serve, fostering innovation, quality, and long-term success for everyone involved.
As we continue to grow and evolve, we remain grateful for both our long-standing partners and our newer collaborations as each plays a vital role in shaping the future of roofing. It is through these relationships that Big Rock Supply continues to stand strong as a trusted name in the industry.