Question: How high can concrete be pumped vertically?
 
Answer: It depends on the maximum placing pressure of the pump. As a rule of thumb, about 1.2 psi per foot of height is required for normal-weight, hard-rock concrete. Single pumps have been used since the early 1980s to place concrete over 1,000 feet high. Manufacturers say it's feasible to place concrete about 1,500 feet high with some of today's pumping equipment.