Copyright Goodheart-Willcox Co., Inc. 296 Section 4 Construction Details Figure 14-41 shows several sizes of reinforced brick masonry lintels. Figure 14-42 shows a detail of a brick masonry lintel integrated into the wall. Slight movement often occurs at the location of lintels. For this reason, control joints are often located at the ends of lintels. A noncorroding metal plate is placed under the ends of lintels where control joints occur. See Figure 14-43. The metal plate permits the lintel to slip and prevent uncontrolled cracking. A full bed of mortar should be used over the plate to distribute the lintel load uniformly. When the mortar has hardened sufficiently, it should be raked out to a depth of 3/4″ and filled with caulking. Arches Arches have been used for centuries to span openings. Some arches span distances of more than 130′. In an arch, masonry units span an opening by transferring vertical loads laterally to adjacent masonry units, and thus to the abutments. An abutment is the masonry, or combination of masonry and other structural members, which supports one end of the arch at the skewback (the surface on which the arch joins the supporting abutment). Several standard types of arches are easily recog- nized in contemporary Figure 14-44. These arches include the blind arch, bull’s eye arch, elliptical arch, fixed arch, Gothic arch, horseshoe arch, Jack arch, multicentered arch, segmental arch, semicircular arch, triangular arch, Tudor arch, and Venetian arch. Goodheart-Willcox Publisher Figure 14-41. Reinforced brick masonry lintels. 4" 6" 8" Reinforcing steel 10" 12" Brick Industry Association Figure 14-42. Detail of a brick masonry lintel with stirrups. Portland Cement Association Figure 14-43. A noncorroding metal plate is placed under the ends of lintels where control joints occur. A full bed of mortar will be placed over the plate.