2104 Construction — 2025 California Building Code

Masonry construction shall comply with the requirements of Sections 2104.1.1 and 2104.1.2 and with the requirements of either TMS 602 or TMS 604.

2104.1.1 Support on wood. Masonry shall not be supported on wood girders or other forms of wood construction except as permitted in Section 2304.13.

2104.1.2 Molded cornices. Unless structural support and anchorage are provided to resist the overturning moment, the center of gravity of projecting masonry or molded cornices shall lie within the middle one-third of the supporting wall. Terra cotta and metal cornices shall be provided with a structural frame of approved noncombustible material anchored in an approved manner.

2104.2.1 TMS 602, Article 3.3 B Placing mortar and units. Modify TMS 602, Article 3.3 B.2.c as follows: c. Remove masonry protrusions extending greater than 1/4 inch (6.4 mm) into cells or cavities to be grouted.

2104.2.2 TMS 602, Article 3.4 B Reinforcement. Modify TMS 602, Article 3.4 B.1 through Article 3.4 B.3 as follows:

1. Support reinforcement to prevent displacement caused by construction loads or by placement of grout or mortar. Rein- forcement and embedded items shall be clean, properly positioned and securely anchored against movement prior to grouting. Bolts shall be accurately set with templates or by approved equivalent means and held in place to prevent dislo- cation during grouting.
2. Completely embed reinforcing bars and embedded items in grout in accordance with Article 3.5.
3. Maintain clear distance between reinforcing bars and the interior of masonry unit or formed surface of at least 1/2 inch (12.7 mm) and a minimum of one bar diameter, except where cross webs of hollow units are used as supports for horizontal reinforcement.

2104.2.3 TMS 602, Article 3.4 E Anchor bolts. Replace TMS 602, Article 3.4 E.3 and add Articles 3.4 E.5 and 3.4 E.6 as follows: 3. Anchor bolts in the wythe or face shells of hollow masonry units shall be positioned to maintain a minimum of 1/2 inch (12.7 mm) of grout between the bolt circumference, the wythe or the face shell. For the portion of the bolt that is within the grouted cell, maintain a clear distance between the bolt and the face of masonry unit and between the head of the bolt and the formed surface of grout of at least 1/4 inch (6.4 mm) when using fine grout and at least 1/2 inch (12.7 mm) when using coarse grout. Bolts shall be solidly embedded in grout. 5. Bent bar anchor bolts shall not be allowed. The maximum size anchor shall be 1/2-inch (12.7 mm) diameter for 6-inch (152 mm) nominal masonry, 3/4-inch (19.1 mm) diameter for 8-inch (203 mm) nominal masonry, 7/8-inch (22.2 mm) diameter for 10-inch (254 mm) nominal masonry, and 1-inch (25.4 mm) diameter for 12-inch (305 mm) nominal masonry. 6. Bolts shall be accurately set with templates or by approved equivalent means and held in place to prevent dislocation during grouting.

2104.2.4 TMS 602, Article 3.5 F.1 Grout key. Replace TMS 602, Article 3.5 F.1 as follows: 1. Between grout pours or where grouting has been stopped more than an hour, a horizontal construction joint shall be formed by terminating grout a minimum of 1 1/2 inches (38.1 mm) and a maximum of one-half the masonry unit height below a mortar joint, except at the top of the wall. Where bond beams occur, the grout pour shall be terminated a minimum of 1/2

MASONRY

inch (12.7 mm) below the mortar joint. Horizontal reinforcement shall be placed in bond beam units with a minimum grout cover of 1 inch (25.4 mm) above reinforcing steel for each grout pour.

Grout shall not be handled nor pumped utilizing aluminum equipment unless it can be demonstrated with the materials and equipment to be used that there will be no deleterious effect on the strength of the grout.