50mm Rockwool RWA45 Acoustic Sound Insulation Slab (6.48m2/Pack)

Product Overview

Stone wool insulation slab, measuring 50mm in thickness, designed for use in internal partitions, floors, and roof applications.

Manufactured from high-density stone wool, the slab combines excellent acoustic absorption with reliable thermal insulation and inherent fire resistance. 

Its rigid composition allows a close friction fit between studs or joists, preventing gaps that could compromise performance.

Non-combustible and classified as Euroclass A1, the slab contributes to improved fire safety within the building fabric. Its fibre structure also provides effective sound reduction, limiting noise transfer between rooms and floors.

At 50mm thick, this slab is suited to lightweight partitions and areas where space is limited but effective sound control and fire resistance are still required. 

It is often used in domestic walls, ceilings, and floors where moderate acoustic performance is sufficient without increasing wall or floor build-up depth.

Features & Benefits

• Euroclass A1 fire classification: Non-combustible in accordance with BS EN 13501-1.
• Stone wool mineral slab: Naturally resistant to rot, fungal decay, and insect attack.
• Square-cut edges: Butt together cleanly for continuous insulation layers.
• Porous fibre structure: Absorbs sound energy, reducing noise transfer through walls and floors.
• Semi-rigid slab: Simple to shape with a knife and friction-fit between studs or joists.
• Thermal conductivity 0.035 W/m·K: Helps maintain building energy efficiency.
• Sustainable manufacture: Made from natural volcanic rock, recyclable, zero ODP/GWP.
• 50mm thickness: Common choice for stud walls and floor assemblies.
  
  

Applications

• Standard stud walls: Reliable option for reducing airborne sound.
• Intermediate floor assemblies: Improves separation between rooms above and below.
• Ceilings in residential or office spaces: Reduces noise transfer effectively.
• Drylined linings and partitions: Provides combined thermal and acoustic insulation.
• Home studio soundproofing: 50mm profile provides broadband acoustic absorption for mid-to-high frequency control in recording environments.. 
• HMO internal partitions: Mineral wool construction provides necessary sound dampening within 50mm stud cavities to improve residential privacy.
• Home cinema rooms: Standard 50mm slabs reduce internal resonance and audio bleed within standard wall partitions and decorative bulkheads.

Installation Guidance

• Precision cutting: Use a sharp insulation saw or broad-bladed knife to cut slabs slightly oversized to ensure a compressed friction fit.
• Seamless abutment: Butt all joints tightly together with no visible gaps to maintain the continuity of the fire and acoustic barrier.
• Mechanical support: Secure with appropriate netting or insulation hangers when installing in overhead applications to prevent gravity-induced movement.
• Environmental protection: Store slabs undercover and off the ground to ensure the material remains dry and free from contaminants prior to installation.
• Personal protection: Wear loose-fitting clothing, gloves, and safety goggles to minimise skin and eye contact with mineral fibres.

Soundproofing Guidance

• Mass Enhancement: Combine slabs with high-density soundproof plasterboard to significantly increase the total mass of the partition. 
• Decoupling Strategy: Use resilient bars or independent stud frames in conjunction with the slabs to prevent mechanical vibration from traveling through the structure.
• Acoustic Sealing: Apply acoustic sealant to the perimeter of the partition and around any penetrations to prevent "flanking" noise from bypassing the insulation.
• Cavity Management: Ensure the slab fills at least 75% of the cavity depth to provide optimal sound absorption and prevent internal resonance.

Compliance & Performance

• Thermal conductivity: Declared 0.035 W/m·K (EN 13162).
• Fire performance: Euroclass A1 non-combustible (BS EN 13501-1).
• Certification: CE and Key marked to BS EN 13162:2012 + A1:2015.
• Acoustic standards: Supports compliance with Building Regulations Approved Document E (England & Wales), Section 5 (Scotland), and BB93 (schools) for acoustic performance in internal and separating walls/floors.
• Sound Absorption Class: Achieves Sound Absorption Class A (aw 0.90). Provides up to 50dB sound reduction when used in a standard 70mm metal stud partition.
• Marine/offshore certification: Lloyd’s Register approved as non-combustible.