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IBC Category D,E,F 

The following are all the IBC Category D,E,F2 Code Requirements for lay-in acoustical panels and direct-hung acoustical tiles.

Basic Connections, Perimeter, and Lateral Splay Bracing

Requirements

Minimum intersection strength limits @ MT / CT

180 lbs

Vertical hanger wire 12-gauge @ 4' o.c.

Required

Connection device from vertical wire to the structure above must sustain min 100 lbs

Required

Main tee classifications

Heavy-duty

1 in 6 max plumb of vertical hanger wires

Required

Perimeter vertical hanger wires not more than 8" from wall

Required

Grid end/wall clearance

Min 3/4"

Perimeter closure (molding) width

Min 2 "

Grid connection to perimeter attached on two adjacent walls

Required

Perimeter tee ends tied together

Required

Horizontal restraint (splay wires or rigid bracing) within 2" of intersection and splayed 90° apart at 45° angles

Required

Compression posts (struts) 12' o.c. in both directions, starting 6' from walls

Required

Splay bracing connection strength 200 lbs or the design load, whichever is greater

Required

Partition attachment

Bracing independent of ceiling splay bracing

Seismic separation joint4

Required for areas > 2,500 sq. ft. (or full height partition)

Rigid bracing for ceiling plane elevation changes

Required

Light Fixture Attachment

Requirements

Light fixture (all types) mechanically attached to grid NEC 410-16 (two per fixture unless independently supported)

Required

Surface-mounted fixtures attached to grid

Not required

Pendant-hung fixtures directly supported from structure with 9-gauge wire (or approved alternative)

Required

Rigid lay-in or can light fixtures

 

≤ 10 lbs – one wire to structure (may be slack)

Required

11 to 56 lbs – two wires from housing to structure (may be slack)

Required

≥ 57 lbs – supported directly to structure by approved

Required

Light Fixture Supplementary Hanger Wires

Requirements

Intermediate Duty Main Tees with cross tee rating below 16 lbs./LF

Required

Min. 12-gauge hanger wires must be attached to the grid members within 3 inches of each corner of each light fixture.

 

Heavy Duty Main Tees with cross tee rating below 16 lbs./LF

Required

Min. 12-gauge hanger wires must be attached to the supporting cross tee within 3 inches of the corner of each light fixture.

 

Supplementary hanger wires for Heavy Duty Main Tees with cross tee rating equal to 16 lbs./LF

Not Required

Service Applications

Requirements

Air terminals

 

≤ 20 lbs – positively attached to grid

Required

21 to 56 lbs – positively attached to grid and two wires to structure (may be slack)

Required

≥ 57 lbs – directly supported to structure

Required

Sprinkler heads and other penetration clearance

Min 2" dia. opening or a swing joint

Cable trays and electrical conduit independently supported and braced

Required

Notes

1. Refers to CISCA installation recommendations for zones 3-4 via ASCE 7.

2. The above information is correct to the best of our knowledge at the date of issuance. Because codes continue to evolve, check with a local official prior to designing and installing a ceiling system. This is only intended as a quick reference.

3. Required for ceilings larger than 1,000 square feet.

4. Where substantiating design calculations are not provided.