Malarkey Roofing Products manufactures asphalt roofing materials, including shingles and low-slope roofing membranes. Founded in Oregon in 1956 as a family business, it developed polymer-modified (rubberized) asphalt roofing and incorporates upcycled materials and smog-reducing granules into its shingles. The company operates manufacturing plants in Oregon, California, Oklahoma, Maryland, and Indiana and became part of Amrize in 2025.
GreenCircle Certified — Waste Diversion from Landfill
Life Cycle Assessment Optimized Certification
Certified Sustainability Facts Label
GAF Materials LLCGAF Materials LLC manufactures roofing and waterproofing products for residential and commercial buildings. The company describes itself as North America’s largest roofing manufacturer, with product systems ranging from shingles to commercial roofing membranes.MYERSTOWN, PA
TarcoFounded in 1978, Tarco is one of North America's largest independently owned manufacturers of roofing and building-envelope products. The company has produced roofing underlayments for more than 45 years, including self-adhesive roofing materials, traditional roll roofing, and waterproofing products, and operates manufacturing plants in Pennsylvania, Arkansas, and Texas.GREENCASTLE, PA
TAMKO Building Products LLCFounded in 1944, TAMKO Building Products LLC manufactures residential roofing shingles and waterproofing products. Its name is an acronym for Texas, Arkansas, Missouri, Kansas and Oklahoma, the company’s original trade area; TAMKO says its trade area now covers all 50 states. The company is known for its Heritage and Proline shingle series and describes its roofing products as made at U.S. facilities using some globally sourced component materials.FREDERICK, MD
Simon RoofingFounded in Youngstown, Ohio, around 1900, Simon Roofing is a family-owned commercial roofing company that manufactures the materials it installs and services facilities nationwide. Now led by the third and fourth generations of its founders, the company operates more than 60 service centers and uses its own employed technicians rather than subcontractors. Its SR PreVision laboratory combines roof inspections, sample testing, and data analysis to help facility owners repair or restore roofs before replacement becomes necessary.YOUNGSTOWN, OH