Acoustic Ceiling Armstrong - FAQ (Freq Ask Questions)

Acoustic Ceiling Armstrong - FAQ (Freq Ask Questions)

"Armstrong ceiling panels are relatively light. I prefer “O” brand which is denser and heavier”

What is the use of heavier product ? Heavy does not mean heavy duty.
Heavier panels tend to sag more. You cannot expect good RH performance for heavy products.
Heavier products tend to have less NRC.
Installers need more energy to carry and install.
Heavier ceiling products need stronger suspensions & structures to hold.
Heavier products are dangerous when accidentally fall on people’s head.

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“I like to use fiberglass/rockwool. It has high NRC”

Yes, it absorbs sound better (Good NRC), but it also transmits sound (No CAC).
Acoustical = NRC > 0.50 and CAC > 30 dB.
After some period, the surface layer of fiberglass/rockwools tends to delaminate.
They are too light : not stable enough against slight air movements
Many people are allergic to fiberglass/rockwool.
They are not environmental friendly.
They are generally more expensive because the demand is insignificant if compared to mineral fiber.

Why people cares more about acoustical ceilings than acoustical floorings or acoustical walls?

Floors/walls are often obstructed by furnitures. Even if expensive acoustical floorings/walls are used, their acoustical value cannot be fully utilised.

“I want a 2-hour-fire-rated panel!”

Fire-rating is designated for ceiling-floor assembly. Its criteria is : If there is a fire in this floor, people upstairs may hav … hours to escape.
If there is a fire: the grid can deflect horizontally and the panels drops; fire can get thru the ceiling-penetrations (lightings, diffusers, …) and heat the
concrete slab; a shorter plenum-height helps the flame to heat the slab faster; a thinner concrete slab is easier to be heated and cracked ; …
Armstrong “Fire Guard” products, put together with other items as specified & designed in UL Fire Directories for ceiling-floor assembly, can have …hour fire rating.

For a classroom : Does the sound reflective panels above the teacher acoustically ideal ? Not at all!

That reflective panels will only strengthen the teacher’s voice to the first student in front of the teacher, yet it will significantly increase the reverberation time.
A sound refelctive wall behind the teacher (plus opposite wall which it sound absorptive) is the one effective.