Whenever you think about insulation, two of the most popular choices are Rockwool slabs and fiberglass insulation. Both of which help you improve your indoor temperature, make the home more comfortable, save energy, and reduce noise.
But this is where a lot of users get confused. So int his article we’ll compare Rockwool and fiberglass based on various factors and help you define which one is ideal for your needs?
Table of Contents
What Are Rockwool Slabs
Rockwool, also known as stone wool, is made from volcanic rock. It is created by melting the volcanic rock at high temperatures and then turned into fibers that looks like wool. These fibers are then compressed into thick and durable slabs that are used during insulation process.
Key Features of Rockwool:
- Made from volcanic rock
- Excellent source of noise reduction (or soundproofing)
- Resistant to heat and fire
- Improves indoor temperature
What Is Fiberglass Insulation
Fiberglass insulation is made from fine strands of glass. Which are woven together to create a lightweight material. It is typically available in rolls or batts.
Key Features of Fiberglass:
- Lightweight and easy to install
- Commonly used in homes
- Affordable and widely available
Performance Comparison: Rockwool vs Fiberglass
Both Rockwool and Fiberglass are effective insulation materials, but they work differently. Let’s compare them.
| Rockwool | Fiberglass | |
|---|---|---|
| Thermal Insulation | Has a high R-value (resistance to heat flow). It performs well in extreme temperatures | Also has a good R-value but may lose efficiency in very cold or humid conditions |
| Soundproofing | Excellent at blocking noise due to its density | Reduces noise but is less effective than Rockwool |
| Fire Resistance | Completely fireproof. It can withstand temperatures over 1,800°F (1,000°C) | Fire-resistant but can melt at high temperatures |
| Moisture Resistance | Water-repellent and doesn’t promote mold growth | Absorbs water if exposed, leading to mold and mildew issues |
Installation
Rockwool
- Comes in slabs that are easy to cut and fit.
- Heavier and harder to handle compared to fiberglass.
Fiberglass
- Lightweight and flexible, making it simple to install in walls or ceilings.
- Requires careful handling to avoid skin irritation.
Cost
Rockwool
More expensive upfront. However, it offers long-term savings due to durability and better insulation performance.
Fiberglass
Budget-friendly and widely available. It is a good option for those with limited funds.
Environmental Impact
Rockwool
- Made from natural, sustainable materials.
- Can be recycled, reducing waste.
Fiberglass
- Contains recycled glass but requires more energy to produce.
- Disposal can be more challenging.
Health and Safety Concerns
Rockwool
Does not release harmful particles. Safe for indoor air quality.
Fiberglass
Can release tiny glass fibers into the air. These can irritate skin, eyes, and lungs.
Durability and Lifespan
Rockwool
Highly durable and can last for decades without losing its effectiveness.
Fiberglass
Can sag or settle over time, reducing its efficiency.
Which One Should You Choose
Your choice depends on your needs, budget, and project type. Here’s a quick summary:
| Feature | Rockwool | Fiberglass |
|---|---|---|
| Best For | High performance, soundproofing, fire safety | Budget insulation for general use |
| Cost | Higher upfront cost | More affordable |
| Installation | Easy but heavier | Lightweight, simple |
| Fire Resistance | Superior | Good |
| Moisture Resistance | Excellent | Moderate |
| Noise Reduction | Very effective | Moderate effectiveness |
