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Mineral Wool Insulation

(91 Products)

Mineral wool insulation is the dependable choice for those wanting to reduce sound and heat transmission in their homes. Not only does it absorb sound energy, but it also saves energy whilst improving the acoustic and thermal performance of walls, floors and roofs. Aside from its insulating properties it also provides excellent in-built fire protection.

We offer the best mineral wool insulation slabs on the market from leading brands like Knauf and Rockwool.

Find Out More About Our Types of Mineral Wool Insulation
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Rockwool Mineral Wool Insulation

It's no secret that Rockwool Mineral Wool slabs are all-rounders. With thermal, acoustic and fire preventative properties, you can be sure this robust insulation solution will maintain high performance over the lifetime of your build. All Rockwool RW slab products offer outstanding fire, acoustic and thermal insulation properties. Rockwool Mineral Wool Insulation is composed of renewable volcanic rock (a naturally poor sound conductor), making these slabs especially effective at sound-dampening.

The Rockwool RWA45 Slab delivers excellent acoustic sound insulation. The RW stands for “Rockwool”, A stands for “Acoustic” and the 45 refers to the fact that these slabs have a density of 45kg/m3 and 0.035 W/mK thermal conductivity. You can install these thermal and acoustic insulation slabs in partition walls or under floorboards.

The Rockwool Flexi Slab is another popular option for people after superb noise-proofing. Each mineral wool insulation slab is fitted with a flexible edge, meaning they can be friction fitted to almost any framework.

Knauf Mineral Wool Insulation

Like Rockwool, the Knauf Earthwool RS range contains premium quality rock mineral slabs to suit every insulation need. They are manufactured using Knauf’s unique ECOSE technology; a bio-based binder that contains no added formaldehyde or phenol, meaning the resulting slabs create much lower levels of dust than other slabs and are beautifully soft and easier to handle.

The bio-binder creates a natural brown colour that is distinct from the usual yellow colour of insulation. We recommend Knauf Earthwool RS products for people who need to insulate internal partitions, timber and metal studs, with the added comfort that ECOSE technology provides.

Mineral Wool Insulation Thermal Conductivity

Mineral wool, also known as rock wool or stone wool, is made from a selection of raw materials, such as stone and glass. Mineral wool insulation thermal conductivity varies from product to product. Rockwool RWA45 Acoustic Slabs have a low thermal conductivity value of 0.035 W/mK, whereas Rockwool Flexi Acoustic Slabs have a thermal conductivity of 0.038 W/mK.

Frequently Asked Mineral Wool Insulation Questions

Mineral Wool Insulation vs Fibreglass

For many decades, fibreglass insulation (also known as glass wool insulation or glass mineral wool) was the standard for home construction. So what are the main drawbacks?

First off, fibreglass is sourced from non-renewable materials, specifically plastic reinforced with glass fibres. Fibreglass Insulation is made from up to 30% of recycled glass, like Knauf DriTherm 37 (which is specifically designed for installation in external masonry cavity walls). Secondly, fibreglass insulation has been linked to adverse health impacts, including irritating the skin, eyes, and respiratory system.

Let's consider the properties of each:
●     Eco-friendly - Mineral wool is made of up to 80% recycled content, whereas fibreglass is only made from up to 30%.
●     Weight - Mineral wool insulation slabs are far heavier than fibreglass slabs. They do not bend or sag as easily as fibreglass insulation slabs.
●     Installation - Firm mineral wool slabs can friction-fit into place between studs and joists. Installing fibreglass can be more complicated because it requires staples and/or wires.
●    Fire resistance - Both fibreglass and mineral wool insulation are classed as A1 non-combustible on the Euroclass scale, which means that they do not burn.

Mineral Wool Insulation Key Benefits: 

  • Fire resilience - Euroclass A1 non-combustible
  • Temperature maintenance
  • Noise reduction properties
  • Robustness 
  • Sustainability
  • Water repellent and vapour permeable

How to Cut Mineral Wool Insulation Material

Mineral wool slabs are soft and easy to manipulate. Despite the slabs being dense and thick, you can handle them with ease. There are a few different ways to cut mineral wool that does not require expensive equipment. One of the most popular ways to cut mineral wool slabs is with a serrated blade or with a woodcutting handsaw.

The first step is to mark the measurements on your slab. Marking measurements can reduce the possibility of mistakes. Once you have marked your measurements, you can begin cutting or sawing. It is important to cut insulation in a clear, open environment. You should also use safety equipment like goggles and aprons.

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