256 Section 4 Techniques Copyright Goodheart-Willcox Co., Inc. 9. A _____ is used to tool or strike the bed joints of brick masonry. A. long jointer B. trowel C. short jointer D. All of the above. 10. True or False? The result of too little mortar is called plaster back. 11. _____ allows moisture to flow from inside the wall cavity to the exterior. A. An English bond B. A weep hole C. Spalling D. A mortar hole 12. Which of the following is a vertical load? A. Seismic events B. Occupant weight C. Wind D. Soil 13. True or False? Corbels do not typically support a load. 14. True or False? A solution of hydrochloric acid is used as a cleaning agent for new masonry. 15. You should use acid to clean _____ brick only in extreme cases. A. light B. dark C. colored D. any Apply and Analyze 1. What is the likely outcome of using a trowel that is too large? 2. List three ways of loading mortar on a trowel. 3. What is the correct way to hold a brick to apply mortar and to lay it on the mortar bed? 4. List four tools used to cut brick. 5. Why is it important to place the same amount of tension on a mason’s line each time it is moved? 6. What is the purpose of batter boards? 7. What is the purpose of a corner pole? 8. When starting a wall, why should a dry course of brick be laid out along the wall line? 9. What is the purpose of corbeling? 10. In what two ways do piers differ from columns? 11. When cleaning new masonry by abrasive blasting, what pressure should be used? Critical Thinking Questions 1. Explain what may occur if weep holes are not used or if the weep holes are blocked by mortar. 2. Explain the process of using corner blocks when laying brick between two corner leads. Activities 1. (SCIENCE) Locate a safety data sheet for hydrochloric (muriatic) acid. Read about hazards of this material, necessary safety precautions, and PPE that should be worn when handling and using the acid. Prepare a written or oral report summarizing your findings. 2. (ENGINEERING) As a team project, lay out a building that is 10′ × 14′ in size using stakes and batter boards. Measure and adjust until walls are the correct size and diagonals are within 1/4″ or less of each other.