Copyright Goodheart-Willcox Co., Inc. Chapter 12 Laying Brick 231 corner should be the same. The squareness of a building is based on a right triangle. The 3-4-5 method can also be used to check for squareness. 2. After the wall line has been drawn or chalked, lay out a dry course of brick from corner to corner as shown in Figure 12-25. Arrange the bricks to eliminate as much cutting of units as possible. Allow for a mortar joint between each brick. Mark the joints and then move the bricks aside. See Figure 12-26. Trade Tip For larger layouts, multiples of the 3-4-5 method can be used to ensure corners are at 90°. For example, doubling the method would be 6-8-10, and tripling it would be 9-12-15. Mark head joints Snap chalk line Step 1 Step 2 Step 3 Step 4 Step 5 Goodheart-Willcox Publisher Figure 12-22. Steps in building a four-course corner lead. Author’s image taken at Job Corps, Denison, IA Figure 12-23. Materials have been arranged for efficient work. Multiple locations of brick, mortar boards, and stands have been positioned to reduce time when the mason is laying brick at the different locations. Planks are used to elevate brick to make it easier when selecting brick to lay. Continued