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What Is IIC & STC in Flooring? Acoustic Explained
Acoustic performance has become an increasingly important consideration in modern commercial buildings. Open-plan offices, hotels, educational facilities, healthcare environments, and mixed-use developments all require effective noise control to improve comfort and productivity.
When evaluating flooring specifications, two acoustic ratings appear frequently in technical datasheets: IIC (Impact Insulation Class) and STC (Sound Transmission Class). Understanding these measurements helps architects, consultants, facility managers, and project owners select flooring systems that support better acoustic performance.
Quick Recommendation
- Office Projects: Prioritise high IIC ratings.
- Hotels: Consider both IIC and STC.
- Educational Facilities: Strong acoustic performance improves learning environments.
- Healthcare Projects: Noise reduction supports patient comfort.
- Multi-Level Buildings: Flooring acoustics become critical.
What Is IIC?
IIC stands for Impact Insulation Class. It measures how effectively a floor assembly reduces impact noise travelling through a structure.
Impact noise occurs when an object physically strikes the floor surface. Common examples include:
- Footsteps
- High heels
- Rolling office chairs
- Dropped objects
- Trolley movement
- Furniture movement
A higher IIC rating indicates better impact sound reduction.
What Is STC?
STC stands for Sound Transmission Class. It measures how effectively a building assembly blocks airborne sound transmission.
Examples of airborne sound include:
- Conversations
- Telephone calls
- Meetings
- Television audio
- Music
- General office activity
A higher STC rating indicates better sound isolation between spaces.
IIC vs STC Comparison
| Rating | Measures | Examples |
|---|---|---|
| IIC | Impact Sound | Footsteps, chair movement, dropped items |
| STC | Airborne Sound | Voices, meetings, music, conversations |
Why Acoustic Flooring Matters
Poor acoustic performance can negatively affect productivity, privacy, concentration, and user comfort.
In office environments, excessive impact noise from footsteps or chair movement can become a constant distraction. In hospitality environments, sound transmission between rooms directly affects guest satisfaction.
Acoustic flooring systems help reduce these problems by absorbing and isolating sound energy before it travels through the building structure.
Typical Acoustic Performance Levels
| Rating Range | Performance |
|---|---|
| Below 40 | Poor |
| 40–50 | Moderate |
| 50–60 | Good |
| 60–70 | Very Good |
| 70+ | Excellent |
Actual project requirements vary depending on building type and intended use.
How Flooring Affects IIC Performance
Different flooring materials provide different levels of impact sound reduction.
| Flooring Type | Typical IIC Performance |
|---|---|
| Concrete Slab | Low |
| Ceramic Tiles | Low to Moderate |
| SPC Vinyl Flooring | Moderate to Good |
| Vinyl Flooring with Acoustic Underlay | Good to Very Good |
| Carpet Tile | Very Good |
| Broadloom Carpet | Excellent |
Carpet remains one of the most effective flooring materials for reducing impact noise because the fibre structure naturally absorbs sound energy.
What We See in Singapore Projects
In Singapore commercial offices, acoustic complaints often originate from open-plan layouts rather than poor wall construction.
Hard flooring surfaces can increase reflected sound and amplify foot traffic noise. Carpet tiles and acoustic underlays are commonly specified to improve workplace comfort and reduce distractions.
In hospitality projects, acoustic flooring often plays a significant role in achieving guest satisfaction and meeting consultant performance targets.
Project Reference
In projects such as GEMS World Academy Singapore and various corporate office fit-outs, flooring specifications frequently considered acoustic performance alongside durability and maintenance requirements.
Carpet tile systems were selected in many workplace environments because they offered a practical balance between acoustic control, flexibility, and long-term operational efficiency.
How to Improve Acoustic Performance
- Use carpet tiles or broadloom carpet.
- Install acoustic underlay systems.
- Select flooring with tested IIC ratings.
- Reduce hard reflective surfaces.
- Incorporate acoustic ceiling treatments.
- Consider wall acoustic panels where necessary.
What to Check in Flooring Specifications
- IIC test reports.
- STC performance data.
- Acoustic underlay details.
- Floor assembly configuration.
- Building requirements.
- Manufacturer acoustic certifications.
- Project consultant recommendations.
Related Resources
Carpet Fibre Types – Nylon vs PP vs Wool
Carpet Tile Supplier Singapore
FAQ
What does IIC stand for?
IIC stands for Impact Insulation Class and measures how well a floor reduces impact noise such as footsteps and chair movement.
What does STC stand for?
STC stands for Sound Transmission Class and measures how effectively a building assembly blocks airborne sound.
Which is more important, IIC or STC?
Both are important. IIC focuses on impact noise, while STC focuses on airborne sound transmission.
Does carpet improve IIC ratings?
Yes. Carpet is one of the most effective flooring materials for reducing impact noise and improving IIC performance.
Can vinyl flooring provide good acoustic performance?
Yes. Vinyl flooring combined with acoustic underlay can significantly improve impact sound reduction.
Why do offices use carpet tiles for acoustics?
Carpet tiles help absorb sound, reduce footstep noise, and improve workplace comfort in open-plan environments.
Need Help Selecting Acoustic Flooring?
Acoustic performance should be evaluated alongside durability, maintenance, safety, and lifecycle cost when selecting flooring systems.
Contact ANB Furnishing for acoustic flooring consultation, technical specifications, and commercial project quotations throughout Singapore.
