Grout enables reinforcing steel and masonry units to act together in reinforced masonry. For grout to do this, you must use a proper grout mix and you must place it properly so it bonds well to both the reinforcing steel and the masonry units. Grout is poured in lifts not more than 5 or 6 feet high. One or more grout lifts comprise a grout pour. A grout pour is the total height of grout placed in a masonry wall before constructing additional masonry; it usually should not be higher than 24 feet. BEFORE YOU GROUT If a grout pour exceeds 5 feet, you must make cleanout holes in the bottom course of masonry. They make it easy to remove debris from the grout space before grouting-and allow an inspector to check that the grout space is clean and that the reinforcement is properly located. Before grouting, close the cleanout openings. To grout multiwythe walls, you must tie the wythes together with metal Z or rectangular ties, or joint reinforcement. Try to keep the grout space clear of all mortar fins that protrude into the space from the surrounding masonry. Be sure reinforcement is positioned so there will be at least 1/4 inch of fine grout or 1/2 inch of coarse grout between the reinforcement and the masonry units. This minimum space allows the grout to flow around the reinforcement. READY TO GROUT On higher pours, you must allow enough time for the mortar to set, so the wall gains enough strength to withstand the pressure of the fluid grout. For grout pours greater than 5 feet high, let the masonry cure about 3 days in warm weather or about 5 days in cold weather. For pours greater than 12 inches, use only mechanical vibration for both the consolidation and reconsolidation.