What is the difference between a grout lift and a grout pour?
A grout pour is the total height of masonry to be grouted before additional masonry is installed. A grout pour is made up of several grout lifts. Grout lifts greater than 12 inches must be mechanically vibrated twice once at the time of grout placement and a second time after water has been absorbed by the masonry units, but before the grout loses its elasticity. The next lift of grout should be placed as soon as reasonable after that point. In no case should there be an interruption between lifts greater than 1 hour. When the next lift of grout is placed, the vibrator should extend partway into the previous lift.