Rockwool RWA45 Acoustic Insulation Slab
(10 Products)Rockwool RWA45 Acoustic Insulation Slabs are a high-performance solution for controlling noise, improving fire safety, and enhancing energy efficiency in buildings. With a density of 45 kg/m³, these slabs effectively absorb sound across a wide frequency range, reducing both airborne noise (like voices and music) and impact noise (such as footsteps and vibrations). This makes them ideal for use in walls, floors, and ceilings in residential, commercial, and industrial settings where noise control is essential.
Beyond soundproofing, RWA45 offers crucial fire protection. Its non-combustible stone wool composition not only resists ignition but also slows the spread of flames, buying valuable time for occupants to evacuate, firefighters to respond, and buildings to withstand fire damage. Additionally, its high thermal performance helps maintain stable indoor temperatures, reducing heat loss and improving energy efficiency - ultimately lowering heating and cooling costs. Whether for residential, commercial, or industrial use, it’s a smart investment in safety, comfort, and efficiency.
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Premium Noise Reduction
RWA45 excels in soundproofing performance. With a density of 45kg/m³, these slabs are engineered to effectively reduce sound transmission between rooms, floors, and ceilings. Whether mitigating noise from traffic, conversations, or machinery, they provide a highly efficient solution for creating quieter, more tranquil environments.
Their versatility allows for seamless integration in various projects, whether you're working with timber, steel, or other building materials in:
- Home offices
- Music studios
- Conference rooms
- Residential partitions
Comprehensive Fire Protection
Classified as Euroclass A1, the highest rating for non-combustibility, RWA45 slabs are naturally non-combustible. This means they can withstand extreme temperatures without burning or melting, helping to prevent the spread of fire in case of an emergency.
In addition to protecting your space from fire, the slabs help ensure compliance with building safety regulations, making them an essential element in your construction or renovation project.
This makes them a reliable choice for applications requiring enhanced fire protection, such as:
- Party walls between apartments
- Multi-story residential buildings
- Commercial buildings subject to strict fire codes
Thermal Efficiency
Although RWA45 is best known for its soundproofing qualities, it also provides effective thermal insulation. With a thermal conductivity of 0.035 W/mK, these slabs help regulate temperatures, ensuring consistent indoor comfort while reducing the need for excessive heating or cooling in:
- Ceilings and floors
- Internal walls
- Lofts and attics
Moisture Resistance
RWA45 slabs are engineered to withstand environmental challenges, including moisture exposure. They are water-repellent and vapour-permeable, ensuring that dampness or moisture won’t compromise the insulation’s performance. This moisture resistance is especially important for spaces prone to humidity or damp conditions, such as:
- Basements
- Ceilings
- Partition walls
The ability to repel moisture helps preserve the slabs’ structural integrity, ensuring long-lasting performance without the risk of damage from mould or mildew.
Eco-Friendly and Sustainable
As part of Rockwool’s commitment to sustainability, RWA45 slabs are made from natural volcanic rocks, making them both renewable and recyclable. By choosing RWA45, you're not only improving the soundproofing, fire safety, and thermal efficiency of your building, but you're also contributing to more sustainable building practices.
Key environmental benefits include:
- Renewable materials: Made from abundant volcanic rocks.
- Recyclable: Can be reused, minimising waste and contributing to a greener future.
- Sustainable production: Manufactured using eco-conscious methods.
Why RWA45 Stands Apart: Key Advantages Over Other Insulation Products
While Rockwool offers a variety of insulation products, RWA45 is designed with a specific focus on acoustic performance, making it ideal for soundproofing projects. Compared to other Rockwool slabs, RWA45 excels in its higher density, which contributes to superior sound absorption.
- Fire Resistance: With an A1 non-combustible rating, it outperforms other insulation products in terms of fire safety.
- Moisture Resistance: Water-repellent properties ensure that its performance remains unaffected by humidity or damp conditions.
- Acoustic Absorption: Dense structure makes it far superior to other Rockwool products in terms of soundproofing.
RWA45 Slab Thickness Options
Each thickness offers different benefits in terms of soundproofing and thermal insulation. The common thicknesses available are:
- 25mm
- 30mm
- 40mm
- 50mm
- 75mm
- 100mm
Thicker slabs provide more robust sound insulation and thermal performance, while thinner slabs are ideal for partition walls and areas with limited space.
It’s important to consult with a professional to determine which thickness is best for your specific application.
Installation Tips and Guidance
Installing RWA45 slabs is straightforward. These semi-rigid slabs can be easily cut and compressed to fit into tight spaces such as partition walls and floor cavities. In practice, they can compress by up to 10% of their starting thickness. Here are some essential installation tips:
- Use a utility knife or serrated knife for cutting the slabs to the desired size.
- Wear protective gear: Gloves and safety goggles are recommended to avoid skin irritation and to protect your eyes from any dust created during installation.
- Measure twice, cut once: Always measure and mark the slabs before cutting for a precise fit.
Frequently Asked Rockwool RWA45 Slab Questions
What Does RWA45 Mean?
RWA45 is the name that Rockwool gives to their most popular acoustic insulation slab.
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 will see that there is more than one product on our site labelled RWA45. All slabs are essentially the same product, just with varying thicknesses.
Our 25mm Rockwool RWA45 acoustic sound insulation slab (16 slabs per pack) is the same as our 100mm Rockwool RWA45 acoustic sound insulation slab (4 slabs per pack), only it is not as thick and, therefore, will not provide the same level of soundproofing.
You can read more about these materials on the Rockwool RWA45 data sheets, which are available under ‘Technical Downloads’ on each product page.
Are Rockwool RWA45 Slabs Flammable?
Rockwool RWA45 slabs are classed A1 on the Euroclass scale, which means they achieve the highest rating for non-combustibility and fire performance, and are completely non-flammable.
If you were to hold a blowtorch next to a piece of Rockwool RWA45, it might begin to glow but it will not catch fire or melt, making it an excellent fire barrier solution.
Lloyd’s register of shipping has also certified RWA45 slabs as approved non-combustible materials for fixed offshore installations and MED classed ships.
How To Cut Rockwool RWA45 Acoustic Insulation Slabs?
Like the other slabs in the Rockwool range, RWA45 slabs are extremely easy to cut.
We recommend marking the measurements you need on the slab before cutting so everything's nice and mapped out - preparation is key. You can use a utility knife or even a serrated knife to cut Rockwool slabs.
As always, we encourage our customers to take proper safety precautions during any general building projects.
You should always use safety goggles and even gloves when cutting materials. We also advise cutting the slabs in a large, clear space with appropriate ventilation.
What Are Rockwool RWA45 Acoustic Insulation Slabs Made From?
The production process for Rockwool essentially emulates the inside of a volcano that spins and cools lava in a controlled environment. Rockwool is created by spinning molten rock and minerals with steel slag to create a cotton-candy-like wool product.
Who Are Rockwool?
Rockwool is a industry favourite manufacturer of stone wool insulation. With over 80 years of experience manufacturing stone wool products, they are trusted experts in their field.
They introduced their first thermal acoustic and fire insulation solution to the market in 1962.
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