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APPLICATION OVERVIEW
Full-fill built-in solutions are installed as the walls are built, whilst full-fill blown-in solutions are installed once walls are built and when the building is watertight.
The effective U-value for a party wall can be reduced to zero if the party wall cavity is completely filled with our mineral wool insulation solutions and combined with mineral wool filled cavity barriers at the edges of the party wall cavity.
Party walls also provide an acoustic function, and we have a wide range of solutions which comply with constructions registered in the Robust Details Handbook, providing compliance with sound related building regulations.
RECOMMENDED PRODUCTS
Why Mineral Wool?
Fully filling the party wall cavity with mineral wool allows a zero effective U-value to be claimed in SAP, simplifying compliance with building regulations.
Our party wall solutions are suitable for use with a range of constructions registered in the Robust Details Handbook, removing the need for pre-completion acoustic testing.
Download our Solutions Guide Download our Separating Party Wall PDF
For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766 666.
For written U-value calculations, please email details of your full through construction build-up to technical.uk@knaufinsulation.com and we will respond accordingly to meet your requirements
We are a fully accredited member of the industry leading British Board of Agrément (BBA) U-value and Condensation Calculation Competency Scheme which promotes and assists accurate, objective and consistent calculations of U-values and condensation calculations within the UK construction industry. As part of our ongoing participation in the scheme, we are required to maintain written records for audit trail purposes.
Typical U-values
Separating (party) wall - built in
| U-value (W/m2K) | Party Wall Construction |
| 0.0* | Solid |
| 0.5 | Unfilled cavity with no effective edge sealing |
| 0.2 | Unfilled cavity with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements |
| 0.0* | Fully filled cavity (e.g. by using Earthwool Masonry Party Wall Slab or Earthwool Timber Frame Party Wall Slab) and with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements |
NOTE: By either building a solid wall or fully filling a party wall cavity with mineral wool insulation results in a U-value of 0.0 W/m²K, i.e. zero heat loss.
Typical U-values
Separating (party) wall - blown in
| U-value (W/m2K) | Party Wall Construction |
| 0.0* | Solid |
| 0.5 | Unfilled cavity with no effective edge sealing |
| 0.2 | Unfilled cavity with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements |
| 0.0* | Fully filled cavity (e.g. by using Supafil Party Wall) and with effective edge sealing around all exposed edges and in line with insulation layers in abutting elements |
NOTE: By either building a solid wall or fully filling a party wall cavity with mineral wool insulation results in a U-value of 0.0 W/m²K, i.e. zero heat loss.