What is an alternative to glass wool?

Mineral wool is one of the most popular materials used in domestic and industrial insulation applications.

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According to AMA Research, in 2016 it accounted for around 30% of the insulation product market’s overall value.

This is significant!

Mineral wool and glass wool products are favored among building contractors and DIY enthusiasts for many reasons, including their lightweight, low-density build, ease of installation, and fire protection performance.

With increased popularity, occasional reduced availability is inevitable.

So, what alternatives to mineral wool insulation are available?

And which provides the best value for money and performance?

Table of contents:

Sheep’s Wool Insulation

Sheep’s wool insulation is an excellent alternative to glass wool. With the recent focus on environmental issues and material recycling, natural insulation has emerged prominently in the market. Sheep’s wool, used for centuries in textiles, is now popular in insulation. It doesn’t cause itching, making it easy and safe to install without PPE.

Sheep’s wool insulation offers a range of high-performance, superior quality, natural insulation products made from pure new sheep’s wool. These products effectively reduce heat loss and sound transfer in various applications.

Aisling MacDonald from SheepWool Insulation highlights that the main benefit of sheep’s wool is its breathability. "SheepWool Insulation is the only range on the market to use 100% pure sheep’s wool. Pure wool is completely breathable, ensuring ‘healthy’ insulation in your home," she says.

"Because of its breathability, it absorbs moisture, hence protecting surrounding timbers, especially in older buildings."

MacDonald adds, "Many other ‘natural insulation’ solutions include added elements like polyester, rendering them less effective long-term. Our pure sheep’s wool is completely natural, breathable, and lasts a lifetime. It also purifies air and offers high acoustic insulation performance. SheepWool Insulation is healthy for buildings and their occupants."

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Other Mineral Wool Alternatives

There are several other common alternatives to glass and mineral wool insulation. Here’s the scoop:

Recycled polyester is a newer addition to natural insulation, available from SupaSoft and YBS. Made from post-consumer plastic bottles or other recycled polyester materials, these eco-friendly rolls are long-lasting and safe to install without PPE.

Other natural solutions include wood fibre and hemp insulation.

For a traditional approach, insulation boards like PIR, expanded polystyrene (EPS), and extruded polystyrene (XPS) are available. These well-tested wool substitutes offer excellent thermal qualities and come in various thicknesses for greater convenience.

Multifoil insulation from SuperFOIL, TLX, and others offer top thermal insulation performance. With layers of sheets, foils, and insulating materials, it’s among the thinnest insulation products available, making it a great alternative where space is limited.

Final Thoughts

When choosing a substitute for glass wool, consider factors like insulation performance, cost, environmental impact, ease of installation, and suitability for your specific needs. Consulting with insulation professionals and considering local building codes can help make an informed decision.

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Yes to sheep's wool, very good indeed. But $$$$

In North America, UltraTouch by Bonded Logic performs about the same as fiberglass in the higher registers, and better in the low end.

There’s also a type of spun wood panel found in schools for 70 years, although it’s rare in Europe.

Coconut fiber could be a cool option if it lasts.

For what it's worth, I built a set of panels using fiberglass, and they worked very well. The upholstery fabric used to cover them was so thick, there wasn’t any chance of the fiberglass coming out. There’s a thread about them here somewhere.

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