100 mm Masonry Party Wall Slab (6.55 M2)

The Knauf 100 mm Masonry Party Wall Slab (6.55 m²) is a high-performance mineral wool insulation slab designed for masonry party wall constructions, delivering effective acoustic sound absorption and thermal insulation. Engineered to help improve Rw (sound reduction index) and airborne sound insulation performance, it supports compliance with Building Regulations Part E – Resistance to the Passage of Sound.

Manufactured by Knauf Insulation from non-combustible glass mineral wool, the Masonry Party Wall Slab is designed to fit securely within party wall cavities, reducing sound transmission between adjoining dwellings. The 100 mm thickness provides enhanced acoustic absorption, helping party wall systems achieve strong dB performance when installed as part of a compliant wall build-up. Supplied in packs covering 6.55 square metres, the slabs are lightweight, easy to handle and quick to install on site.

Key Features

• Knauf insulation slab for masonry party wall systems

• 100 mm thickness for improved acoustic performance

• Helps increase Rw (sound reduction) values in party walls

• Reduces airborne sound transmission between dwellings

• Contributes to thermal insulation performance

• Non-combustible glass mineral wool

• Supplied in packs covering 6.55 m²

Typical Applications

• Masonry party wall insulation

• Separating walls between attached dwellings

• Semi-detached and terraced housing

• Apartments and residential developments

• Projects requiring improved airborne sound reduction

Performance & Workability

• Enhances airborne sound insulation (measured in dB) within party wall systems

• Supports compliant acoustic performance when used in tested wall build-ups

• Absorbs sound within cavities to reduce sound transfer

• Friction-fit design for secure, continuous installation

• Lightweight and easy to cut for fast on-site fitting

Technical Specification

• Product Type: Masonry Party Wall Insulation Slab

• Manufacturer: Knauf Insulation

• Insulation Type: Glass Mineral Wool

• Thickness: 100 mm

• Coverage per Pack: 6.55 m²

• Acoustic Performance: Improves Rw / dB values in party wall constructions*

• Application: Masonry Party Wall Cavities

• Reaction to Fire: Non-combustible

*Acoustic performance depends on full wall build-up and installation quality.

Why Choose Knauf 100 mm Masonry Party Wall Slab?

The Knauf 100 mm Masonry Party Wall Slab is a proven solution for improving Rw sound reduction and dB acoustic performance in masonry party walls. Designed to support Part E compliance, it delivers reliable sound absorption, thermal benefits and fire safety, making it a trusted choice for modern residential construction.