Interesting news, exciting changes…

Larimer/Shannon Group is celebrating its 15th anniversary. Together, our team has over 150 years of combined experience with products and systems associated with the commercial building envelope. Also, we have some exciting news! We are thrilled to represent Johns Manville in Georgia and Tennessee.

We are working on a new, improved and resourceful website for architects, consultants, owners and professional contractors. In the meantime, please reach out to us in our Atlanta and Nashville offices.

We invite you to learn more about Larimer/Shannon Group and the products we represent below.

We are commercial roofing solution specialists.

Larimer/Shannon Group is the commercial roofing representative for Johns Manville, Georgia-Pacific DensDeck, Green Roof Outfitters, Rooftop Anchor, SafePro and Westile for Georgia and Tennessee.

Founded in 2003 by principals John Larimer and Tim Shannon, they established the firm as an ‘industry best’ sales and marketing organization representing exterior commercial building products and systems in Georgia, Central and Eastern Tennessee. Its company’s success is due to our solution driven, resourceful, responsive, experienced staff; the proven manufacturers of products and systems represented; its comprehensive technical knowledge and understanding of proper application processes; and its commitment to exceptional customer service. Recognized as the ‘first call’ resource for architects, specifiers, construction consultants, contractors, public and private owners, and building material distributors in the markets they serve. Its expertise allows them to address the spectrum of their design, performance and application criteria associated with exterior system selection, code compliance, extreme site or weather conditions, aesthetics, texture, color, green building and sustainability. Its representation is one that is focused on bringing value to all participants in the commercial construction process.

Its clients are Architects & Design Professionals, Contractors, and Building Owners in the private, public and government sectors. The commercial roofing solutions include single ply and bituminous roofing systems, liquid applied, insulation and cover boards, various commercial roofing components, roof paver and vegetative roofing systems and energy-efficient roofing systems.

Our Product Lines

Johns Manville

Johns Manville offers a comprehensive line of single ply (TPO, EPDM and PVC) and bituminous roofing system (SBS, APP and BUR) solutions. Each system is available with quality thermal insulations, cover boards, adhesives, cements, roof coatings, specialty roofing products and the possibility of a JM Peak Advantage Guarantee up to 30 years. Learn More

Georgia-Pacific DensDeck

G-P DensDeck Roof Boards are designed to address four persistent challenges inherent in commercial roofing assemblies: fire resistance, moisture resistance, strength and dimensional stability. Plus, there are assemblies that focus on sound control and acoustic solutions. Learn More

Green Roof Outfitters

Green Roof Outfitters provide an easy and affordable green roof solution. The Green Roof Outfitters’ module is built on the foundation of superior function without sacrificing ease of installation. It encompasses all of the requirements of green roof horticulture experts related to soil depth, adequate drainage, and reservoir capabilities while integrating all of the suggestions from the installers, owners, and architects such as built-in handles, easy installation, connection and irrigation features, and sloped applications.Learn More

Rooftop Anchor

Rooftop Anchor was established by a team of solution-minded professionals well versed in fall protection and rooftop work environments. Having spent years depending using fall protection equipment themselves, the founders were confident that they could deliver industry-leading solutions to enhance worker access while improving safety. Rooftop Anchor is a recognized leader in OSHA-compliant fall protection technology and guarantees the highest standards in its products.Learn More


SafePro is a national manufacturer of roof top safety and security products designed by roofing experts with over 30 years of experience. Learn More


Westile addresses commercial building plaza design and construction needs whether it's simple or complex with innovative products, colors and finishes. Learn More


Contact Us

Offices in Atlanta & Nashville

Our website is under construction but we are ready to go! Call us or leave a request here.



3621 Vinings Slope SE, Suite 4450
Atlanta, GA 30339

Ph.: (770) 272-9090 Fx.: (770) 272-9030


600 9th Ave. S, Suite 120
Nashville, TN 37203

Ph.: (615) 866-9554 Fx.: (770) 272-9030