Ceiling System Selection Guide

Mineral Fibre vs Metal Panel Ceilings: How to Choose

When specifying a commercial ceiling project, mineral fibre panels and metal panels are the two most common options. Their performance characteristics differ significantly. This guide compares the two across four key dimensions: acoustics, fire performance, durability, and cost.

1. Acoustic Performance

Mineral fibre panels are the clear leader in acoustic performance. High-density boards such as Armstrong ULTIMA+ achieve NRC values of 0.70 or above, making them ideal for offices, meeting rooms, and school classrooms where noise control is a priority.

Metal panels (aluminum baffles, metal micro-perforated panels) have lower inherent acoustic performance, but can achieve reasonable results when paired with acoustic insulation backing. They are better suited to corridors and public areas where acoustics are less critical.

2. Fire Performance

Mineral fibre panels are non-combustible or fire-resistant. Armstrong and Knauf mineral fibre boards meet GB8624-2012 Class A2 or Euroclass B standards, satisfying fire safety requirements in most commercial buildings.

Metal panels are non-combustible by nature, offering superior fire performance. They are preferred for high-rise buildings, hospital clean zones, and areas with stringent fire code requirements.

3. Moisture Resistance

Standard mineral fibre panels are sensitive to high humidity and are not recommended for spaces exceeding RH90%. For humid environments, choose moisture-resistant variants such as the Armstrong BioGuard range.

Metal panels are unaffected by moisture and are the natural choice for kitchens, bathrooms, and basements.

4. Cost and Maintenance

Mineral fibre panels are lower in unit cost, lightweight, and easy to install — making them the preferred choice for most commercial projects. Metal panels carry a higher price point and greater weight, but offer superior long-term durability and lower maintenance costs.

5. Quick Selection Guide

Article 2: Understanding Ceiling Acoustics

What Is NRC? A Guide to Ceiling Acoustic Performance

When purchasing mineral fibre ceiling tiles, you will often see parameters such as "NRC 0.45" or "NRC 0.70". What does NRC actually mean? This guide helps you read and interpret acoustic data.

NRC — Noise Reduction Coefficient

NRC is a single-number rating that describes how much sound a material absorbs. It ranges from 0 to 1. Higher values mean better sound absorption.

• NRC 0.00: Fully reflective (glass, smooth metal)

• NRC 0.45: Moderate absorption (standard mineral fibre)

• NRC 0.70: High absorption (Armstrong ULTIMA+)

• NRC 1.00: Perfect absorption (theoretical maximum, rarely achieved)

NRC 0.45 vs 0.70 — What's the Real Difference?

The numbers may seem close, but the practical difference is noticeable:

An NRC 0.45 board absorbs approximately 45% of incident sound energy, suitable for general office environments. An NRC 0.70 board absorbs approximately 70%, making it ideal for meeting rooms, open-plan offices, and auditoriums where stronger noise control is needed.

CAC — Ceiling Attenuation Class

CAC measures a ceiling system's ability to block sound transmission between adjacent rooms. A higher CAC value means better sound insulation between spaces.

Armstrong ULTIMA+ carries a CAC of 35, effectively attenuating sound transmission between rooms — an important consideration for offices and meeting rooms requiring privacy.

αw — Weighted Absorption Coefficient

αw (weighted absorption coefficient) is the European standard for acoustic absorption, similar to NRC but evaluated across a wider frequency range.

Knauf HERADESIGN Superfine achieves an αw of 1.00 (the highest rating), indicating excellent sound absorption across all frequency bands — making it the preferred choice for acoustically demanding spaces such as recording studios and performance venues.

Quick Selection Reference

• General office: NRC ≥ 0.55

• Meeting rooms / phone booths: NRC ≥ 0.65, CAC ≥ 30

• Large open-plan office: NRC ≥ 0.70

• Recording studio / theatre: αw ≥ 0.95