Heldenfels Enterprises Inc., along with subcontractors Precast Erectors and Grout Tech, recently completed phase one precast/prestressed concrete seating riser and wall erection for the Dallas Cowboys' Stadium in Arlington, Texas. Work included nearly three-quarters of the precast — almost 2,700 pieces — yielding much of North and South sides. The second phase comprises the North and South field levels, plus East and West end zones.