Glass wool or mineral wool - which is best for insulation?

When you&#;re insulating a building, it is important to ensure you have the best materials for the job. Fibreglass and mineral wool are two of the more popular types of insulation for this kind of project, and both will provide you with individual benefits depending on your requirements.

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We&#;ve packed this handy guide with useful information for you so that you&#;re fully informed of some of the important factors to consider when deciding if fibreglass or mineral wool is the go-to for you.

Without further ado, let&#;s dive right in.

Table of contents:

Glass wool insulation

Glass wool insulation, also known as fibreglass, is made from glass fibres. Glass is heated to very high temperatures until it melts, and is then spun quickly to create fibres. These fibres are then bound together to be used as insulation.

The glass fibres create pockets of air which act as barriers to prevent heat loss because air is a poor conductor of heat. Glass wool can be found in batts and rolls, loose-fill insulation and also within insulation boards.

Mineral wool insulation

Mineral wool, also known as ROCKWOOL or stone wool, is made from a selection of raw materials, such as stone and glass. These raw materials are treated in a similar way to glass, in that they are melted at high temperatures until they melt, and then they are spun to form fibres, similar to wool. This wool is then packaged up into batts, rolls or slabs.

R-value

When comparing ROCKWOOL and fibreglass batt wall insulation, they have a roughly similar R-value of around 0.57 per inch of thickness. Because they have the same thermal conductivity &#; for instance, 0.044 W/mK for both Knauf Loft Roll Earthwool Insulation and ROCKWOOL Twin Roll Insulation &#; they will provide equal performance in this department.

Sustainability

If you&#;re looking at the most sustainable option, glass wool is generally made up of up to 86% recycled materials, whereas mineral wool in comparison consists of up to 70% recycled materials. As environmental impact and sustainability are becoming more of a focus, this is becoming more of an important factor when choosing the right insulation material.

Sound insulation

In terms of sound insulation, mineral wool is often the preferred choice for noisy areas. This is because it is much denser than glass wool, so much less sound travels through the insulation.

Ease of installation

If you&#;re considering installing the insulation yourself, mineral wool is considered much easier to handle. Although heavier than glass wool, mineral wool is much easier to cut, move and fit into place. Glass wool on the other hand is limper, which makes it hard to fit into the spaces required.

Moisture resistance

If you&#;re looking for a moisture-resistant form of insulation, mineral wool is the clear winner. Mineral wool is resistant to water, so it doesn&#;t get damp and provides good growing conditions for fungi, mould, mildew or other bacterial growth.

Glass wool, on the other hand, can get damp, as well as promote the growth of fungi, mildew and rot, causing its insulating properties to be severely reduced.

Fire resistance

Although both mineral wool and glass wool are non-combustible, mineral wool has far better fire-resistant qualities, so much so that it can be used as a fire stop. So, this is something to consider if where you&#;re installing insulation is going to be at risk of fire, and to what extent.

Cost

If you&#;re conscious of a limited budget, then glass wool may be the choice of insulation for you. It can cost around 10% less than mineral wool and still is effective at insulating your home to reduce heat loss and energy bills.

Final thoughts

Glass wool and mineral wool are both types of insulation materials commonly used in construction.

While both offer excellent thermal insulation properties, mineral wool tends to have superior fire resistance and moisture resistance compared to glass wool, making it suitable for applications where these properties are crucial, such as in high-temperature environments or areas prone to moisture exposure.

Additionally, mineral wool is denser and heavier than glass wool, providing better sound insulation capabilities.

Now that you know how these two insulation options compare, you can easily choose the right one for your specific needs.

Whichever form of insulation you choose, insulating your home is a great way to keep your home warm, prevent heat loss and reduce energy bills. Call our team of experts today for any queries or advice on  692 206.

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Is Glass Wool Insulation Expensive

Glass Wool

As energy efficiency becomes a growing concern in the construction industry, more homeowners and builders are turning to insulation materials like glass wool to improve the thermal performance of buildings. However, a common question arises: is glass wool insulation expensive? The answer depends on several factors, including the material's cost, installation process, and long-term benefits.

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Understanding Glass Wool Insulation

 

Glass wool insulation, made from fine fibers of glass, is one of the most widely used insulation materials today. It is known for its excellent thermal and acoustic properties, lightweight nature, and versatility in application. Available in various forms such as rolls, batts, and boards, glass wool can be used to insulate walls, roofs, floors, and even HVAC systems.

 

Cost Factors

 

The cost of glass wool insulation varies depending on several factors, including the quality of the material, the thickness required for the project, and the specific brand. On average, glass wool tends to be more affordable than some other high-performance insulation materials like rockwool or foam board. However, prices can range widely, with premium products commanding higher costs.

 

One of the reasons for the relatively lower cost of glass wool is its production process. Glass wool is often made from recycled glass, which is readily available and inexpensive. This not only keeps manufacturing costs down but also makes glass wool an environmentally friendly choice.

 

Installation Costs

 

Installation is another factor that affects the overall expense of using glass wool insulation. Fortunately, glass wool is lightweight and easy to work with, which can reduce labor costs. Its flexibility allows it to be easily cut and fit into various spaces, making the installation process quicker and more straightforward compared to denser materials like rockwool.

 

In some cases, homeowners may choose to install glass wool insulation themselves, further reducing costs. However, professional installation is recommended for larger projects or when ensuring maximum insulation efficiency is critical.

 

Long-Term Value

 

While the initial cost of glass wool insulation is an important consideration, it is essential to evaluate the long-term value it offers. Glass wool's excellent thermal performance can lead to significant energy savings over time. By reducing the need for heating and cooling, glass wool insulation can lower utility bills, providing a return on investment that offsets the initial expense.

 

Additionally, glass wool is durable and long-lasting. Once installed, it can maintain its insulating properties for decades, meaning that it does not need to be replaced frequently. This durability further enhances its cost-effectiveness over the long term.

 

Comparing with Other Insulation Materials

 

When comparing the cost of glass wool insulation with other materials, it is clear that glass wool is competitively priced. While some insulation options, such as spray foam, may offer higher R-values (a measure of thermal resistance), they also come with higher upfront costs. Glass wool provides a balanced solution, offering good insulation performance at a reasonable price point.

 

Is It Worth the Investment?

 

So, is glass wool insulation expensive? While the answer depends on the specific requirements and budget of the project, glass wool is generally considered an affordable option that delivers excellent value for money. Its combination of cost-effectiveness, ease of installation, and long-term energy savings makes it a popular choice for both residential and commercial insulation projects.

 

In conclusion, glass wool insulation offers a cost-effective solution for improving the energy efficiency of buildings. Although the initial cost may vary depending on the quality and thickness required, the long-term benefits of reduced energy bills and lasting durability make it a smart investment. For those looking to balance performance and affordability, glass wool insulation remains a competitive option in the market.

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