Johnson County Building Supply Inc. Product, Services, or Solution is helping supply the Mountain City Area contractors and home owners with their building supplies and building material needs. Wood and Lumber options - Pressure Treated Lumber - Plywood - Cedar - Wood - Finish Lumber - Along with other building materials for Plumbing - Insulation - Sheetrock - Vinyl Siding - Metal Roofing - LVL - I-Joist and more. Stop by and see how they can help you with quality products and great service!