- Local building codes for safe construction rely on two fire ratings to evaluate compliance: (1) Material Flame Spread/Smoke
Development Index Rating, and (2) Fire Resistance Assembly Rating. These ratings are based on ASTM standards, and compliance
is determined by several independent, non-government testing services such as Underwriters Laboratories, Inc.
- Two types of fire-rated construction assemblies pertain to acoustical ceiling systems:
- Roof/Ceiling Assemblies
Ceiling system, lighting, HVAC outlets, and other penetrants through the ceiling, the plenum, roof support structure, and
roof assembly including deck, insulation, and roofing system.
- Floor/Ceiling Assemblies
Ceiling system, lighting, HVAC outlets, and other penetrants through the ceiling, the plenum, structural system, subfloor,
and finish floor.
- Selecting the right UL Fire-Rated Assembly
- Establish the hourly rating needed to meet code requirements.
- Determine the existing or planned building elements, including structural, mechanical, electrical, and finish materials, in
the fire-rated assembly.
- Refer to the Fire Resistance Rating Summary (PDF) to determine the UL design numbers and ceiling system products that correspond to the fire-rated assemblies that meet
- Armstrong offers Fire Guard™ Ceilings and Suspension Systems
- Fire Guard Ceilings are specially formulated to provide enhanced resistance against structural failure.
- Fire Guard Suspension Systems have patented expansion relief to help maintain structural integrity of the ceiling.