1607.1 General.
BC § 1607.1
Live loads are those loads defined in Chapter 2 of this code. Table 1607.1Minimum Uniformly Distributed Live Loads, LO, and Minimum Concentrated Live Loads g Occupancy or Use Uniform (psf)Concentrated pounds)Occupancy or Use Uniform (psf)Concentrated pounds) 1. Apartments (see residential)— — 2. Access floor systems Office use50 2,000 Computer use100 2,000 3. Armories and drill rooms150 n— 4. Assembly areas— Fixed seats (fastened to floor)60 m Follow spot, projections and control rooms50 Lobbies100 m Movable seats100 m Private assembly spaces, including conference rooms50 Stages floors150 n Platforms (assembly)100 m Other assembly spaces100 m 5. Balconies and Decks h1.5 times the live load for the occupancy served. Not required to exceed 100 psf— 6. Catwalks40 300 7. Cornices60 — 8. Corridors — First floor100 Other floorsSame as occupancy served except as indicated 9. Dining rooms and restaurants100 m— 10. Dwellings (see residential)— — 11. Elevator machine room and control room grating (on area of 2 inches by 2 inches)— 300 12. Equipment rooms, including pump rooms, generator rooms, transformer vaults, and areas for switch gear, ventilating, air conditioning, and similar electrical and mechanical equipment 75 — 13. Finish light floor plate construction (on area of 1 inch by 1 inch)— 200 14. Fire escapes (Exterior)100 — On single-family dwellings only40 15. Garages (passenger vehicles only)40 oNote a Trucks and busesSee Section 1607.7 16. Handrails, guards and grab barsSee Section 1607.8 17. HelipadsSee Section 1607.618. Hospitals Corridors above first floor80 1,000 Operating rooms, laboratories60 1,000 Patient rooms 40 1,000 19. Hotels (see residential)— — 20. Libraries Corridors above first floor80 1,000 Reading rooms60 1,000 Stack rooms150 b, n 1,000 21. Manufacturing Heavy250 n3,000 Light125 n2,000 22. Marquees, except one- and two-family dwellings75 — 23. Office buildings Corridors above first floor80 2,000 File and computer rooms shall be designed for heavier loads based on anticipated occupancy— — Lobbies and first-floor corridors100 2,000 Offices50 2,000 24. Penal Institutions— Cell blocks40 Corridors100 25. Recreational uses:— Bowling alleys, poolrooms and similar uses75 m Dance halls and ballrooms100 m Gymnasiums100 m Ice skating rink250 n Reviewing stands, grandstands and bleachers100 c, m Roller skating rink100 m Stadiums and arenas with fixed seats (fastened to floor)60 c, m26. Residential— One- and two-family dwellings Uninhabitable attics without storage i10 Uninhabitable attics with storage i, j, k20 Habitable attics and sleeping areas k30 Canopies, including marquees20 All other areas40 Hotels and multifamily dwellings Private rooms and corridors serving them40 Public rooms and corridors serving them100 27. Roofs All roof surfaces subject to maintenance workers300 Awnings and canopies: Fabric construction supported by a skeleton structure5 m All other construction, except one- and two-family dwellings20 Ordinary flat, pitched, and curved roofs (that are not occupiable)20 Primary roof members exposed to a work floor Single panel point of lower chord of roof trusses or any point along primary structural members supporting roofs over manufacturing, storage warehouses, and repair garages2,000 All other primary roof members300 Occupiable roofs: Roof gardens100 Assembly areas100 m All other similar areasNote lNote l28. Schools Classrooms40 1,000 Corridors above first floor80 1,000 First-floor corridors100 1,000 29. Scuttles, skylight ribs and accessible ceilings— 200 30. Sidewalks, vehicular driveways and yards, subject to trucking 300 d, m8,000 e or 20,000 d31. Stairs and exits One- and two-family dwellings40 300 f All other100 300 f32. Storage warehouses (shall be designed for heavier loads if required for anticipated storage)— Heavy250 n Light125 n33. Stores Retail First floor100 1,000 Upper floors75 1,000 Wholesale, all floors125 n1,000 34. Vehicle barriersSee Section 1607.9 35. Walkways and elevated platforms (other than exitways)60 — 36. Yards and terraces, pedestrians100 m— For SI: 1 inch = 25.4 mm, 1 square inch = 645.16 mm 2 , 1 square foot = 0.0929 m 2 , 1 pound per square foot = 0.0479 kN/m 2 , 1 pound = 0.004448 kN, 1 pound per cubic foot = 16 kg/m 3 . a. Floors in garages or portions of buildings used for the storage of motor vehicles shall be designed for the uniformly distributed live loads of this Table or the following concentrated loads: (1) for garages restricted to passenger vehicles accommodating not more than nine passengers, 3,000 pounds acting on an area of 4 1/2 inches by 4 1/2 inches; (2) for mechanical parking structures without slab or deck which are used for storing passenger vehicles only, 2,250 pounds per wheel. b. The loading applies to stack room floors that support nonmobile, double-faced library book stacks, subject to the following limitations: 1. The nominal book stack unit height shall not exceed 90 inches; 2. The nominal shelf depth shall not exceed 12 inches for each face; and 3. Parallel rows of double-faced book stacks shall be separated by aisles not less than 36 inches wide. c. Design in accordance with Section 1029.1. d. The concentrated wheel load of 20,000 pounds shall be applied as follows 8,000 pounds on an area of 20 square inches, 20,000 pounds on a 20 inch by 10 inch area. e. The concentrated wheel load shall be applied on an area of 4.5 inches by 4.5 inches. f. The minimum concentrated load on stair treads shall be applied on an area of 2 inches by 2 inches. This load need not be assumed to act concurrently with the uniform load. g. Where snow loads occur that are in excess of the design conditions, the structure shall be designed to support the loads due to the increased loads caused by drift buildup or a greater snow design determined by the department (see Section 1608). h. See Section 1604.8.3 for decks attached to exterior walls. i. Uninhabitable attics without storage are those where the maximum clear height between the joists and rafters is less than 42 inches, or where there are not two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. This live load need not be assumed to act concurrently with any other live load requirements. j. Uninhabitable attics with storage are those where the maximum clear height between the joists and rafters is 42 inches or greater, or where there are two or more adjacent trusses with web configurations capable of accommodating an assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. The live load need only be applied to those portions of the joists of truss bottom chords where both of the following conditions are met: i. The attic area is accessible from an opening not less than 20 inches in width by 30 inches in length that is located where the clear height in the attic is a minimum of 30 inches; and ii. The slopes of the joists or truss bottom chords are no greater than two units vertical in 12 units horizontal. The remaining portions of the joists or truss bottom chords shall be designed for a uniformly distributed concurrent live load of not less than 10 pounds per square foot. k. Attic spaces served by stairways other than the pull-down type shall be designed to support the minimum live load specified for habitable attics and sleeping rooms. l. Areas of occupiable roofs, other than roof gardens and assembly areas, shall be designed for appropriate loads as approved by the department. Unoccupied landscaped areas of roofs shall be designed in accordance with Section 1607.13.3. m. Live load reduction is not permitted. n. Live Load reduction is only permitted in accordance with Section 1607.11.1.2 or Item 1 of Section 1607.11.2. o. Live Load reduction is only permitted in accordance with Section 1607.11.1.3 or Item 2 of Section 1607.11.2. (Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023) Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.
