Why Earthwool Insulation Batts Are Better Than Blow-In Insulation

If you're comparing Earthwool insulation batts vs blow-in insulation, you're not alone. It's one of the most common questions we get at Perth Insulation Centre. Both are popular types of thermal insulation — but when it comes to long-term value, safety, performance, and sustainability, Earthwool batts win every time.

What’s the Difference Between Batts and Blow-In?

Earthwool batts are pre-cut insulation slabs designed to fit snugly between timber or steel framing. They come in a variety of R-values (like R4.0, R5.0, and R7.0) and are designed for DIY or professional installation.

Blow-in insulation (or loose-fill) is made from materials like cellulose or fibreglass that are blown into ceiling cavities using specialist equipment. It’s often used in retrofits and attics.

1. Batts Maintain Their R-Value Over Time

One of the biggest issues with blow-in insulation is that it settles over time. This reduces its thickness and dramatically decreases its R-value. Earthwool batts, by contrast, hold their shape and retain their thermal resistance for decades when installed correctly.

For example, Earthwool R2.7 HD wall batts deliver long-term thermal and acoustic benefits that loose-fill simply can’t match in vertical cavities.

2. Batts Are Easier to Inspect, Repair & Upgrade

If you ever need to do roof maintenance, electrical work, or upgrade your insulation, batts can be lifted and reinstalled. Loose-fill insulation? Not so easy. It usually requires vacuuming out the entire ceiling cavity — a messy and expensive job.

Planning to upgrade to R6.0 or R7.0 batts? It’s a simple swap with batts, but a full re-install with blow-in.

3. Earthwool Is Safer and Cleaner to Handle

Made using ECOSE® Technology, Earthwool is low itch, low dust, and free from added formaldehyde. It’s one of the most user-friendly insulation materials on the market.

Blow-in insulation often contains cellulose (paper-based) or recycled fibreglass, which can irritate the skin, eyes, and respiratory system. You’ll need full PPE to work around it — and even then, dust can linger in the air for hours.

4. Earthwool Batts Perform Better in Perth’s Climate

Loose-fill insulation can be disturbed by high wind pressure in ventilated roof cavities. In Perth’s hot, dry summers and occasional storms, this can lead to inconsistent thermal coverage.

Earthwool batts are denser, more stable, and less affected by air movement — making them a much better choice for roof insulation in Perth.

5. Blow-In Isn’t Ideal for All Applications

Blow-in is usually limited to flat ceiling spaces and isn’t suitable for walls, underfloors, or small roof cavities. Earthwool, on the other hand, comes in formats for every part of your home:

• Wall insulation
• Ceiling/roof insulation
• Underfloor insulation

6. It’s More Sustainable (and Locally Available)

Earthwool is made from up to 80% recycled glass and is certified for its low environmental impact. Plus, you can buy it locally right here in Perth from our insulation warehouse.

Conclusion: Why We Recommend Earthwool Over Blow-In

If you want durable, high-performance, safe, and sustainable insulation — Earthwool batts are the clear winner. While blow-in has some short-term retrofit uses, it simply can’t compete in most home or commercial scenarios.

Need help choosing the right product? Our team at Perth Insulation Centre can recommend the perfect Earthwool insulation for your project. Call 0417 910 326 or browse our full range online.