Code of Massachusetts Regulations › 780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS › Chapter 16 - Structural Design › Section 1607 - LIVE LOADS › Subsection 1607.1 - General

Current through Register 1525, July 5, 2024
Live loads are those loads defined in Section 1602.1.
TABLE 1607.1 MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS,
L
o, AND MINIMUM CONCENTRATED LIVE
				  LOADSg
OCCUPANCY OR USE
UNIFORM (psf)
CONCENTRATED (lbs.)
1. Apartments (see residential)
-
-
2. Access floor systems
Office use
50
2,000
Computer use
100
2,000
3. Armories and drill rooms
150
-
4. Assembly areas and theaters
-
Fixed seats (fastened to floor)
60
Follow spot, projections and control
							 rooms
50
Lobbies
100
Movable seats
100
Stages and platforms
125
Other assembly areas
100
5. Balconies (exterior) and decksh
Same as occupancy served
-
6. Bowling alleys
75
-
7. Catwalks
40
300
8. Cornices
60
-
9. Corridors, except as otherwise
							 indicated
100
-
10. Dance halls and ballrooms
100
-
11. Dining rooms and restaurants
100
-
12. Dwellings (see residential)
-
-
13. Elevator machine room grating (on area
							 of 4 in2)
-
300
14. Finish light floor plate construction
							 (on area of 1 in2)
-
200
15. Fire escapes
100
-
On single-family dwellings only
40
16. Garages (passenger vehicles only)
Trucks and buses
40
Note a
See Section 1607.6
17. Grand stands
(see stadium
							 and arena bleachers)
-
-
18. Gymnasiums, main floors and
							 balconies
100
-
19. Handrails, guards and grab bars
See Section 1607.7
20. Hospitals
Corridors above first floor
80
1,000
Operating rooms, laboratories
60
1,000
Patient rooms
40
1,000
21. Hotels (see residential)
-
-
22. Libraries
Corridors above first floor
80
1,000
Reading rooms
60
1,000
Stack rooms
150b
1,000
TABLE 1607.1-MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS,
L
o, AND MINIMUM CONCENTRATED LIVE
				  LOADSg
OCCUPANCY OR USE
UNIFORM
(psf)
CONCENTRATED
(lbs.)
23. Manufacturing
Heavy
250
3,000
Light
125
2,000
24. Marquees
75
-
25. Office buildings
Corridors above first floor
80
2,000
File and computer rooms shall be designed
							 for heavier loads based on anticipated occupancy
-
-
Lobbies and first-floor corridors
100
2,000
Offices
50
2,000
26. Penal institutions
Cell blocks
40
-
Corridors
100
27. Residential
One- and two-family dwellings
Uninhabitable attics without storagei
10
Uninhabitable attics with limited
storagei, j, k
20
Habitable attics and sleeping areas
30
-
All other areas
40
Hotels and multifamily dwellings
Private rooms and corridors serving them
40
Public rooms and corridors serving
them
100
28. Reviewing stands, grand stands and
							 bleachers
Note c
29. Roofs
All roof surfaces subject to maintenance
							 workers
300
Awnings and canopies
Fabric construction supported by a light
							 weight rigid skeleton structure
5
All other construction
nonreducible
Ordinary flat, pitched, and curved
							 roofs
20
Primary roof members, exposed to a work
							 floor
20
Single panel point of lower chord of roof
							 trusses or any point along primary structural members supporting roofs:
Over manufacturing, storage ware houses,
							 and repair garages
2,000
All other occupancies
300
Roofs used for other special purposes
Note 1
Note 1
Roofs used for promenade purposes
60
Roofs used for roof gardens or assembly
							 purposes
100
30. Schools
Classrooms
40
1,000
Corridors above first floor
80
1,000
First-floor corridors
100
1,000
31. Scuttles, skylight ribs and accessible
							 ceilings
-
200
32. Sidewalks, vehicular drive ways and
							 yards, subject to trucking
250d
8,000e
33. Skating rinks
100
-
TABLE 1607.1-MINIMUM UNIFORMLY DISTRIBUTED LIVE LOADS,
L
o, AND MINIMUM CONCENTRATED LIVE
				  LOADSg
OCCUPANCY OR USE
UNIFORM
(psf)
CONCENTRATED (lbs.)
34. Stadiums and arenas
Bleachers
100c
-
Fixed seats (fastened to floor)
60c
35. Stairs and exits
Note f
One- and two-family dwellings
40
All other
100
36. Storage warehouses
(shall be designed for heavier loads if required for
							 anticipated storage)
Heavy
250
Light
125
37. Stores
Retail
First floor
100
1,000
Upper floors
75
1,000
Wholesale, all floors
125
1,000
38. Vehicle barrier systems
See Section 1607.7.3
39. Walkways and elevated platforms
(other than exitways)
60
-
40. Yards and terraces, pedestrians
100
-
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 square
							 inch = 645.16 mm2, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479
							 kN/m2, 1 pound = 0.004448 kN,
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 Table 1607.1 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 4.5 inches by 4.5 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 bookstacks, subject to the following
								limitations:
1. The nominal bookstack 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 bookstacks shall
								be separated by aisles not less than 36 inches wide.
c. Design in accordance with ICC 300.
d. Other uniform loads in accordance with an
								approved method which contains provisions for truck loadings shall also be
								considered where appropriate.
e. The concentrated wheel load shall be applied on
								an area of 4.5 inches by 4.5 inches.
f. Minimum concentrated load on stair treads (on
								area of 4 square inches) is 300 pounds.
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 building official (see Section 1608). For special-purpose
								roofs, see Section 1607.11.2.2.
h. See Section 1604.8.3 for decks attached to
								exterior walls.
i. Attics without storage are those where the
								maximum clear height between the joist and rafter is less than 42 inches, or
								where there are not two or more adjacent trusses with the same web
								configuration capable of containing a rectangle 42 inches high by 2 feet wide,
								or greater, located within the plane of the truss. For attics without storage,
								this live load need not be assumed to act concurrently with any other live load
								requirements.
j. For attics with limited storage and constructed
								with trusses, this live load need only be applied to those portions of the
								bottom chord where there are two or more adjacent trusses with the same web
								configuration capable of containing a rectangle 42 inches high by 2 feet wide
								or greater, located within the plane of the truss. The rectangle shall fit
								between the top of the bottom chord and the bottom of any other truss member,
								provided that each of the following criteria is met:
i. The attic area is accessible by a pull-down
								stairway or framed opening in accordance with Section 1209.2, and
ii. The truss shall have a bottom chord pitch less
								than 2:12.
iii. Bottom chords of trusses shall be designed
								for the greater of actual imposed dead load or 10 psf, uniformly distributed
								over the entire span.
k. Attic spaces served by a fixed stair shall be
								designed to support the minimum live load specified for habitable attics and
								sleeping rooms.
l. Roofs used for other special purposes shall be
								designed for appropriate loads as approved by the building official.