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Tri-State Stone and Building Supply Inc. has been supplying Carderock stone, building stone and building materials to the greater Washington DC Metropolitan area for over 90 years. As a family-owned and operated business, we carry an extensive inventory of hand-selected building stone and building materials, including flagstone, wallstone, decorative landscape stone, building stone, and veneers. Our expert team is dedicated to providing top-notch customer service and ensuring timely delivery of our products.