AltusGroup 
Thermally efficient CarbonCast Enclosure Systems can provide continuous insulation (c.i.) to meet ASHRAE codes, provide excellent load-bearing performance and can weigh up to 50% less than conventional precast because of carbon fiber grid reinforcing and shear trusses. CarbonCast Double Tees weigh up to 8% less than conventional tees and eliminate the potential for flange corrosion.
Armtec
Armtec’s industry-leading architectural and structural prestressed and precast concrete products range from steps, paving stones, slabs and wall panels to highly engineered structural components designed and installed for bridges, sports venues, parking garages and more.
Clark Pacific 
(West Coast Only) Clark Pacific is a proud contributor to the vibrant urban landscape of the West Coast. For over 40 years we have provided architects and owners superior quality precast solutions from our plants in West Sacramento and Fontana, California. Our solutions include architectural, GFRC, natural stone, and structural precast products. Contact us for your next project.
High Concrete Group - (Mid-Atlantic and Mid-West Only)
High Concrete Group combines innovation, proven technology, and over 50 years’ experience to offer the first-rate service, technical support, and precast concrete structures you need. We can provide the Concrete Innovations & Answers® you need, together with high-quality precast parking garages, architectural cladding and wall panels to meet your design, cost, schedule, and lifecycle performance requirements.
National Precast Concrete Association
represents 575 precast concrete producers. Find one in your area on their website. NPCA provides education, trade show, magazines, Plant Certification program, technical literature, and guide specifications for precast products. "Precast Concrete: Quality, Value, Permanence"
4specs Discussion Forum - Great place to ask questions about specifications, products and technical data. Free - no registration required to read or post (subject to moderation).
For complete Division 03 Concrete products and ingredients listings
AltusGroup
Thermally efficient CarbonCast Enclosure Systems can provide continuous insulation (c.i.) to meet ASHRAE codes, provide excellent load-bearing performance and can weigh up to 50% less than conventional precast because of carbon fiber grid reinforcing and shear trusses. CarbonCast Double Tees weigh up to 8% less than conventional tees and eliminate the potential for flange corrosion.
Armtec
Armtec’s industry-leading architectural and structural prestressed and precast concrete products range from steps, paving stones, slabs and wall panels to highly engineered structural components designed and installed for bridges, sports venues, parking garages and more.
Clark Pacific
(West Coast Only) Clark Pacific is a proud contributor to the vibrant urban landscape of the West Coast. For over 40 years we have provided architects and owners superior quality precast solutions from our plants in West Sacramento and Fontana, California. Our solutions include architectural, GFRC, natural stone, and structural precast products. Contact us for your next project.
High Concrete Group - (Mid-Atlantic and Mid-West Only)
High Concrete Group combines innovation, proven technology, and over 50 years’ experience to offer the first-rate service, technical support, and precast concrete structures you need. We can provide the Concrete Innovations & Answers® you need, together with high-quality precast parking garages, architectural cladding and wall panels to meet your design, cost, schedule, and lifecycle performance requirements.