Figure 2-17. Laying the top outside edge of the block to the line
2-19. Making Adjustments. You must make all adjustments to the final position of the block while the
mortar is flexible. If you try to make adjustments after the mortar has stiffened, it will break the mortar
bond and allow water to penetrate. Level and align each block to the mason's line by tapping it lightly
with the trowel handle.
2-20. Installing the Closure Block. The last block to be installed in every course is called the closure
block. When you install the closure block butter all edges of the opening in the wall and all four vertical
edges of the closure block with mortar. Carefully lower the block into place. If any mortar falls out and
leaves an opening in the joint, remove the block and repeat the procedures (Figure 2-18).
Figure 2-18. Installing the closure block