What is the difference between a grout pour and a grout lift?
A grout pour is the total height of masonry that is grouted before the erection of additional masonry. A grout pour can be made of several grout lifts. A grout lift is the height of grout that is placed at one time. After each lift is placed, the grout must be consolidated and allowed to become plastic before the next lift is poured. The next lift, however, must be placed before the grout lift below undergoes its initial set. The Masonry Standards Joint Committee Code (ACI 530/ASCE5/TMS402), limits the height of a grout lift to 5 feet. Depending on the timing between lifts, it is possible that the first grout lifts may develop fluid pressures that are significantly greater than the fluid pressure of each lift. The contractor must brace walls as necessary to prevent separation of wythes or failure of the faces of hollow units from excessive fluid pressure.