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Soultions

IBC Category C

The following are all the IBC Category C2 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 / CT3

60 lbs

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

Required

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

Not required

Main tee classifications

Intermediate- or heavy-duty

1 in 6 max plumb of vertical hanger wires4

Required

Perimeter vertical hanger wires not more than 8" from wall

Not required unless molding < 7/8"

Grid end/wall clearance

Min 3/8"

Perimeter closure (molding) width

Min 7/8" (or use perimeter wires)

Grid connection to perimeter attached on two adjacent walls

Not permitted

Perimeter tee ends tied together

Required

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

Not required

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

Not required

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

Not required

Partition attachment

Allowed only if ceiling is able to move laterally

Seismic separation joint

Not required

Rigid bracing for ceiling plane elevation changes

Not 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

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 3/8" on all sides

Cable trays and electrical conduit independently supported and braced

Not required

 

Notes

1. Refers to CISCA installation recommendations for zones 0-2 via ASCE 7. Max ceiling weight: 2.5 psf.

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. All USG DONN® brand ceiling suspension systems meet these requirements.

4. Per ASTM C635.