Copyright Goodheart-Willcox Co., Inc. Chapter 14 Wall Systems 303 Brick Industry Association Figure 14-57. Brick sills. Left—Brick sill in veneer construction. Right—Brick sill in cavity wall construction. Sealant Brick sill Weep holes Metal anchor Wood or steel frame Flashing 15 min. 1" min. Sealant Brick sill Weep holes Flashing 15 min. 1" min. Uldis Maters/Shutterstock.com Figure 14-58. Concrete sills and thresholds being used to finish the openings for windows and doors. Types of movement joints include expansion joints, control joints, building expansion joints, and construc- tion joints. Each joint type is designed to perform a specific task. The various types should not be used interchangeably. Expansion Joint An expansion joint separates separate brick masonry into segments to prevent cracking due to changes in temperature, moisture expansion, elastic deformation due to loads, and creep. Creep is the deformation of materials under load or stress. In brick work, creep usually occurs in the masonry joints. Expansion joints are either horizontal or vertical. See Figure 14-59. Highly elastic materials are placed in a continuous, unobstructed opening through each Brick Industry Association Figure 14-59. Methods of forming vertical expansion joints in a brick wall. Sealant and backer rod Sealant and backer rod Sealant and backer rod Neoprene pad Premolded foam pad A C B D Copper waterstop Sealant and backer rod