Glass Mineral Wool - Knauf Insulation Masonry Party Wall Slab

Knauf Insulation Masonry Party Wall Slab


Party separating walls


Glass Mineral Wool


Masonry Party Wall Slab is a Glass Mineral Wool slab, designed for use in masonry separating party walls, that offers thermal and acoustic performance.

It is non-combustible insulation with the best possible Euroclass A1 reaction to fire classification, and is manufactured using Knauf Insulation's unique bio-based binder, ECOSE® Technology.


  • Fully filling the party wall cavity contributes towards a zero effective U-value, simplifying compliance with building regulations.
  • Suitable for use with a range of constructions registered in the Robust Details Handbook reducing the need for on-site acoustic testing.



Thickness (mm)Length (mm)Width (mm)Euroclass Reaction to Fire ClassificationFacingArea Per Pack (M²)

Robust Details

Robust DetailMinimum Cavity WidthBlock TypeBlock Density (kg/m³)FinishesParge CoatZero U-Value
E-WM-11100mmLightweight Aggregate1350-1600Plasterboard on dabsYesYes
E-WM-16100mmDense Aggregate1850-2300Plasterboard on dabsYesYes
E-WM-175mmDense Aggregate1850-2300Wet plasterNoYes
E-WM-275mmLightweight Aggregate1350-1600Wet plasterNoYes.
E-WM-375mmDense Aggregate1850-2300Plasterboard on dabsYesYes
E-WM-475mmLightweight Aggregate1350-1600Plasterboard on dabsYesYes
E-WM-575mmBesblock Star Performer1528Plasterboard on dabs on cement renderYesYes
E-WM-675mmAircrete600-800Plasterboard on dabs on cement renderYesYes
E-WM-1075mmAircrete600-800Plasterboard on dabs on cement renderYesYes
E-WM-11100mmBesblock Star Performer1528Plasterboard on dabsYesYes
E-WM-1275mmPlasmor Aglite Ultima1050Plasterboard on dabsYesYes
E-WM-1375mmAircrete600-800Plasterboard on dabs on cement renderYesYes
E-WM-18100mmDense Aggregate1850-2300Wet plasterNoYes
E-WM-19100mmBesblock Star Performer1528Plasterboard on dabsYesYes
E-WM-19100mmDense Aggregate1850-2300Plasterboard on dabsYesYes
E-WM-19100mmLightweight Aggregate1350-1600Plasterboard on dabsYesYes
E-WM-21100mmLightweight Aggregate1350-1600Wet plasterNoYes
E-WM-22100mmLightweight Aggregate1350-1600Plasterboard on dabsNoYes
E-WM-22100mmPlasmor Aglite Ultima1050Plasterboard on dabsNoYes
E-WM-25100mmWienerberger Porotherm850-950Plasterboard on dabsYesYes
E-WM-26100mmBesblock Star Performer1528Plasterboard on dabsNoYes
E-WM-2975mmWienerberger Porotherm850-950Plasterboard on dabsYesYes
E-WM-31100mmH+H Celcon Elements575Plasterboard on dabsNoYes
E-WM-3275mmLightweight Aggregate1350-1600Plasterboard on dabsNoYes

* Partial sheathing of the cavity faces of the separating wall for structural reasons is permited but the cavity width must be 50mm including sheathing (Timber Frame Party Wall Slab only)

Certification & Memberships

Eurofins Gold
Euroclass A1 Reaction to Fire Classification
Green Guide Rating A+
CE Marking
Red List Free
EN 15804
Made in Britain

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