LAMC §91.9105 directs LADBS to identify pre-1976 tilt-up concrete buildings and require ASCE 41-17 evaluation and wall-to-roof anchorage retrofit. The program parallels the URM ordinance, targeting warehouses, big-box retail, and industrial structures across Los Angeles.
After the 1971 Sylmar and 1994 Northridge earthquakes exposed weak wall-to-roof connections in tilt-up concrete buildings, Los Angeles added Division 91 retrofit protocols to LABC Chapter 91. Owners of pre-1976 tilt-ups receive an LADBS Order to Comply requiring a structural evaluation under ASCE 41-17, then design and installation of continuity ties, ledger bolting, plywood roof diaphragm reinforcement, and out-of-plane wall anchors per the LADBS Standard Plan. Compliance generally runs over 25 years, mirroring the non-ductile concrete schedule. Most affected buildings are warehouses, light industrial, and large retail structures in the Eastside, Harbor, and San Fernando Valley.
Failure to evaluate, file retrofit plans, or complete construction within the LADBS milestones triggers substandard orders, recordation against title, daily fines, and possible vacate orders if a roof connection failure is imminent.
Los Angeles, CA
LAMC §91.9509 (Ordinance 183893) requires identification and retrofit of pre-1976 non-ductile reinforced concrete buildings citywide, with a 25-year complian...
Los Angeles, CA
LA's Division 88 ordinance (1981) was one of the first mandatory URM retrofit programs in the U.S., targeting approximately 8,000 unreinforced masonry bearin...
See how Los Angeles's tilt-up concrete retrofit rules stack up against other locations.
Help us keep this page accurate. If you notice an error or outdated information, let us know.