Vertically ribbed concrete is well known for its uniform appearance and natural tendency to aid weathering by channeling rain and dirt down its grooves. The innovative use of rope-lined formwork has produced vertically ribbed concrete that is, moreover, particularly economical and attractive. The rope-lined formwork technique played a major role in the construction of the Dental Hospital Center at Liverpool, England. There, a long-span framed building of composite steel and concrete construction was required to create large, unobstructed floor areas for clinics and laboratories. In the method employed at Liverpool, the texturing of the walls involves pinning the rope to the inside faces of the forms before placing them in position. After the usual preparation of formwork panels, the ropes are cut to length, one length being bent to form two channels. A hand operated compressed air gun quickly nails the ropes to the faces of the forms. Strict time control over the vibration of the concrete, the removal of the formwork, and the subsequent pulling out of the ropes is necessary. If the formwork is struck too soon, the ropes come away with it. If the ropes are left in too long, however, they become too strongly embedded for easy removal. Striking the formwork 24 hours after placing the concrete, and removing the ropes after another 24 hours, results in a trouble-free operation. The rope-lined formwork technique produces an attractive surface, uniformly textured, with excellent weathering qualities. The grooves, with their descending helical pattern, assist rapid and uniform water dispersion and evaporation. The recessed horizontal joints concealing lift marks also break up the surfaces, forming continuous water checks and thus minimizing streaking.