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General Recommendations Wall Moldings (refer to Figure 4) Figure 6b - Splayed Seismic Wire Bracing Attachment
• Referenced sources per hierarchy: 2003 IBC • Wall moldings (perimeter closure angles) are required to 5116" drill-in expansion - 171 - 1
(Intemational Building Code), American Society of Testing have a horizontal flange 2 Inches wide, unless alternate anchor minimum —
Materials (ASTM C 635, ASTM C 836), American Society of methods are approved prior to installation by local Molding
Civil Engineers (ASCE 7 -02) and Ceilings and Interior department and the designer of record. One end of the ceiling Structural concrete \
Systems Construction Assodation (CISCA). grid shall be attached to the wall molding, the other end shah
• Partitions that are tied to the ceiling and all part0ons have a 3/4 inch dearance from the wag and free to slide. Steel strap 1" wide x 2" long
greater than 6 feet in height shall be laterally braced to the • The grid shall be attached at two adjacent wails (pop x 12 gage minimum
structure. Bracing shall be Independent of the ceiling splay rivets or approved method).
bracing system. • There shall be a minimum 3/4 inch dearance from the end 3 turns
For further information on bracing of non -load bearing of the grid system at unattached walls.
partitions refer to NWCB technical document #201. Splayed seismic bracing wire
• All main beams (runners) are be heavy duty (HD). Figure 4 - Wall Molding Requirements
• All cross tees shall be capable of carrying the design load
without exceeding deflection equal to 1/360 of its span. 4441/4/ • Power driven fasteners must be approved for the
• These recommendations are intended for suspended appropriate loading. Power driven fasteners shall have
ceilings including grid, panel or tile, light fixtures and air ICC-ES approval and Spedal Inspection.
terminals weighing no more than 4 lbs. per square foot. ,y, • Terminal ends of each main beam and cross tee must be
• M wire ties are to be three turns around itself within three '4 supported within 8 Inches of each wall with a perimeter wire
inches. Twelve gage Hanger wire spaced 4 foot on center ` ' ° (refer to Figures 4 and 5b) -
(refer to Figure 1). 0 ° � '.
�'I Electrical Fixtures
Figure 1 o . , • Light fixtures weighing less than 10 pounds shall have
Spreader bar or other suitable system one 12 gage hanger wire connected from the fixture to the
required to keep perimeter components structure above. The wire may be slack.
from spreading apart • Light fixtures weighing more than 10 pounds and less than
i 56 lbs. shall have two 12 gage wires attached at opposing
comers of the light fixture to the structure above. These wires
Spreader Bars (refer to Figure 4) may be slack.
• Spreader (spacer) bars or other means approved by local • Light fixtures weighing more than 56 lbs. shall be
I building department shall be used to prevent the ends of the supported by directly from the structure above. These wires
main beams at perimeter walls from spreading open during a must be taut.
seismic evens. Perimeter wires shall not be in lieu of spreader • Pendant mounted fixtures shall be directly supported from
k' bars. the structure above using a 9 gage wire or an approved
n • Wire tying is an acceptable alternative to spreader bars. alternate support without using the ceiling suspension system
• Spreader bars are not required If a 90 degree intersecting for direct support.
• Changes in ceiling plane will require positive bracing. cross or main is within 8 Inches of the perimeter waft. • Tandem fixtures may utilize common wires.
Lateral Force Bracing Hanger (Suspension) Wires (refer to Figures 5a and 5b) Mechanical Services
• Ceilings constructed of lath and plaster or gypsum board, • Hanger and perimeter wires must be plumb within 1 in 6 • Terminals or services weighing 20 lbs. but not more than
screw or nail attached to suspended members that support a unless (Figure 5a) counter sloping wires are provided (Figure 56 lbs. must have two 12 gage wires connecting them to the
ceiling on one level extending from wall to wall shall be 5b). ceiling system hangers or the structure above. These wires
exempt from lateral bracing requirements. may be slack.
• Lateral force bracing is the use of vertical struts Figure 5a • Terrninals or services weighing more than 56 lbs. must be
. (compression posts) and splay wires (refer to Figure 2). independently supported directly from the structure above.
• Lateral force bracing is required for ceilings over 144 Plumb 116 iq These wires must be taut
square feet
•. Lateral force bracing shall be 12 feet on center Minimum 8" i Seismic Separation Joints (refer to Flgure 7)
(maximum) and begin no farther than 6 feet frommvalls. • For ceiling areas exceeding 2500 square feet, a seismic
Itk _.L separation joint or full height wall partition that breaks the
_ ceiling shall be provided unless analyses are performed of the
Figure 2 - Lateral Force Bracing ceiling's bracing system, closure angles and penetrations to
— — — —o provide suffident clearance.
45° or - ss 45° r less j • The layout and location of the seismic separation joint
12 gag j shall be per the designer of record and noted on the plans. If
—
splay_ a seismic separation joint is required by the designer, the
''� brace �— designer may use the generic joint shown in Figure Tor a
proprietary joint. The amount of free movement (gap design)
45° or les‘ / Figure 5b - Countersloptng shall be per the designer of record.
'• 4`ess
t' ■ O Figure 7 - Seismic Separation Joints
Main beam Minimum ''�., (' Minimum
Cross tee 45° angle 45 angle
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• Splay wires are to be four 12 gage wires attached to the 1 1 3�
main beam. Wires are arrayed 90° from each other and at an
angle not exceeding 45° from the plane to the ceiling. _ _
• Splay wires are to be within 2 inches of the connection of -- ap desn r i
the vertical shut to suspended ceiling.
• Rigid bracing may used In lieu of splay wires. • Hanger wires shall be 12 gage and spaced 4 feet on
• Ceilings with plenums less than 12 Inches to structure are center or 10 gage spaced 5 feet on center. Pop rivet
not required to have lateral bracing. • Any connection device at the supporting construction shall Flange
• Vertical struts must be positively attached to the be capable of carrying not less than 100 pounds.
suspension systems and the structure above. • For essential facilities, hanger wire connections must be Special Inspections
• The vertical strut may be EMT conduit, metal studs or a capable of carrying 200 pounds and bracing (splay) wires shall • Special inspections may be required by t
proprietary compression post (refer to Figure 3). be capable of carrying 440 pounds, shot -In anchors in munldpalky. Contact the local building depar
concrete are not permitted for bradno wires.
• Bracing wires shaft be attached to the grid and to the Sprinlders
Figure 3 - Maximum Recommended Lengths for Vertical Struts structure in such a manner that they can support a design load • For ceilings without rigid bracing, sprinkl
EMT Conduit of not less than 200 pounds or the actuel design load, with a penetrations shall have a 2 inch oversize rio
112' EMT conduit Up to 6 -0" safety factor of 2, whichever is greater (Figure 6b). adapter through the ceiling tile to allow freer
3/4" EMT conduit Up to 8' -6" least 1 Inch In all horizontal directions. Flexi
1" EMT conduit Up to 10' -0" Figure 6a - Vertical Hanger Wire Attachment that can accommodate 1 Inch free movemer
1 Metal Stud permitted as an alternate.
1 -518° metal stud (25 gage) Up to 6-2" i
t -n
Sho anchor 2-1/2" metal stud (25 gage) Up to 10'-6" "A
Note: Plenum areas greater than 11' -0" will require engineering Structural concrete 18 1
calculations.
Ceiling dip = i
3 turns
Vertical hanger wire
- Ceiling Details