PTAC Consulting Engineers, Inc. has been in the precast-prestressed concrete design and detailing business since 1991. The principals of the company have 75 years of combined experience in the design and detailing of precast-prestressed concrete structures. More than 25 of those years were spent as employees of producer plants. PTAC has completed many projects of all sizes and levels of complexity using three-dimensional graphics software. Our experience using three-dimensional graphics software for detailing projects provides a rare combination of industry knowledge and graphics expertise. Our client list includes more than 20 of the top producers in North America.