Copyright Goodheart-Willcox Co., Inc. 238 Section 4 Techniques 7. Finish laying the first corner and complete the second in the same manner. 8. Construct the first stretcher course of the wall by laying the outside first and then the inside. The stretcher courses should be laid from the leads to the center. Level, plumb, and line up each course before beginning the header course. See Figure 12-47. A line should be used on all backing courses (the inside tier) to ensure a good face. 9. Lay the header course from each lead toward the center. Level, plumb, and line up the header course. 10. Lay the outside tier up to the next header course keeping it straight, level, and plumb. This is called header high. 11. Lay the inside tier up to the same height. Be careful to keep it level with the outside tier as it is laid up. This is important because a level surface is required for the header course. 12. Continue as before until the desired height is reached. Strike the joints and brush the wall at the proper time. Trade Tip The term “header high” refers to the distance up a masonry wall to the top of the brick course directly under a header course. 12.3.3 Laying an 8″ Common Bond, Double Wythe Wall with Leads Common (American) bond is strong and can be laid up quickly. It consists of a course of headers between every five to seven courses of stretchers. The heading course serves as a bond between the inside and outside 4″ tiers. The mortar joint is 3/8″ or 1/2″ thick. P R O C E D U R E Constructing an 8″ Common Bond Wall with Leads 1. Lay out the wall location as was done with the 4″ wall. In addition, locate a second line (about 8″) inside the first wall line. This distance is equal to the average length of the brick being used. 2. Lay out the bond to eliminate excessive cutting for windows and doors. This is an important step! 3. Lay the corner bricks as shown in Figure 12-46. The header course is starting at the second course, but it can start wherever specified. 4. Lay the first course of stretchers for the corner. Four or five stretchers should be sufficient. Lay the header course as shown in Figure 12-46. 5. Lay successive courses of stretchers until you reach the next header course. Level, plumb, and line up each course as it is laid. 6. Lay the header course, breaking the bond in the usual manner. P R O C E D U R E (continued) Author’s image taken at Job Corps, Denison, IA Figure 12-44. Brush the wall when the mortar is stiff enough. Make sure that the brush selected has soft bristles it is important not to damage the joints that have been struck. Author’s image taken at Job Corps, Denison, IA Figure 12-45. The completed project is shown with the instructor and masonry student.