275 Copyright Goodheart-Willcox Co., Inc. Objectives After studying this chapter, you will be able to: • Describe different types of masonry wall systems. • Explain the use of ties, fl ashing, weep holes, lintels, sills, jambs, and expansion joints in masonry wall systems. • Explain the effects of moisture condensation in masonry walls and the methods used to resist condensation. • Describe construction procedures for thin brick veneer, including thin bed set, thick bed set, and precast panels. • Explain the design, function, and construction of arches. • Describe the joints used for movement in masonry. • Understand the function of caps and copings. • Install a retaining wall. Tech Terms abutment arch building expansion (isolation) joint camber cap centering collar joint construction joint (cold joint) control joint coping corbel curtain wall depth expansion joint extrados fl ashing hardscape intrados jack arch keystone lintel multicentered arch panel wall racking reinforced masonry walls R-value rise segmental arch segmental retaining walls (SRW) Wall Systems CHAPTER 14 semicircular arch skewback soffi t span spandrel spring line springing thermal mass U-value voussoir weep hole This chapter covers some of the common prac- tices used in constructing masonry wall systems. Solid masonry walls, curtain and panel walls, hollow masonry walls, anchor veneered walls, composite walls, reinforced masonry walls, thin brick veneer, openings and arches, and garden walls are discussed. The information in this chapter is intended to aid in choosing appropriate building methods and proce- dures to construct masonry wall systems. Masonry walls can be single-wythe walls (one unit in thickness) or multiple-wythe walls. The walls may be reinforced or unreinforced. Masonry walls are classified as solid walls, four-inch RBM (reinforced brick masonry) curtain and panel walls, hollow walls, anchored veneered walls, composite walls, and reinforced walls. Masonry walls are popular because they provide excellent structural performance, are easily main- tained, and are attractive. They provide an envelope that is energy efficient due to their high thermal mass. Thermal mass is the characteristic of heat capacity and surface area capable of affecting building thermal loads by storing heat and releasing it at a later time. Materials with high thermal mass react more slowly to temperature fluctuations and therefore reduce peak energy loads. All buildings must comply with energy code requirements. Energy performance requirements are found in such documents as the US Department of Energy—Energy Efficiency Building Energy Codes 101: An Introduction and the RECA (Responsible Energy Code Alliance) guides to the International Energy Conservation Code.