Isover RD Party Wall Roll

RD Party Wall Roll is a glass mineral wool roll that can be used to reduce the passage of sound across a masonry cavity separating (party) wall and minimise air movement within the cavity, improving its thermal performance. 
When used as part of Robust Detail separating wall constructions E-WM-17, E-WM-20 & E-WM-24, it removes the need for costly pre-completion sound testing and can achieve +5dB over acoustic performance requirements set out in Building Regulations Approved Document E (England & Wales). Rolls are ready-cut to 2 x 455mm to fit between standard wall tie spacing.

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Product Features

  • Proprietary component of Robust Detail Constructions E-WM-17, E-WM-20, E-WM-24 (England & Wales) and V-WM-20 (Scotland)
  • Meets the generic full-fill mineral wool specification required by many masonry separating (party) wall Robust Details
  • Can be also used in PCT (pre-completion testing) masonry party wall constructions
  • Manufactured from up to 82% recycled glass
  • Achieves a Eurofins Gold certification, the highest accreditation for indoor air quality

Fire Classification

Euroclass A1 Reaction to Fire classification according to EN 13501-1.

Product Specification

Thickness (mm) Length (m) Width (m) λD Declared thermal conductivity (W/m.K) RD Declared thermal resistance (m².K/W)
75 8.50 2 x 0.455 0.036 2.05
100 6.00 2 x 0.455 0.036 2.75
125 5.00 2 x 0.455 0.036 3.45
150 4.00 2 x 0.455 0.036 4.15

Product Benefits

  • Thermal Bypass Solution - Can achieve a zero U-value for party walls, as defined in Building Regulations (Approved Document L1A, Table 3), when fully filling the party wall cavity and in combination with mineral wool filled cavity barriers at the edges of the cavity.
  • Excellent Acoustic Performance - Helps reduce unwanted noise between attached properties when used as part of a Robust Detail construction.
  • Sustainability - Manufactured from up to 82% recycled glass on a plant that uses 100% renewable electricity. For further details visit
  • Robust Detail Compliant - Proprietary component of three Robust Detail constructions (E-WM-17, E-WM-20 & E-WM-24) and conforms to the generic full-fill mineral wool specification.
  • Saves Time and Cost - When used as part of a Robust Detail construction, it removes the need for costly pre-completion sound testing, making it a more cost effective solution to implement.
  • Fire Classification - Achieves a Euroclass A1 Reaction to Fire classification, according to EN 13501-1.

Key Considerations

When using Isover RD Party Wall Roll, you need to satisfy yourself that use of the product meets all relevant national Building Regulations and guidance as well as local, national and other applicable standards relevant for your construction or application, including requirements in relation to fire and applicable height restrictions.
Please refer to the following product documents: