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EpsiLine Insulation Boards


epsiline-pir-plasterboard-laminateThe primary component of Wetherby’s EpsiLine Internal Wall Insulation System is the high performance thermal insulation board, which is supplied pre-bonded to a tapered edge, standard plasterboard.

EpsiLine insulation boards are manufactured from rigid polyisocyanurate (PIR) using a blowing agent that has zero ozone depletion potential (zero ODP) and low global warming potential (GWP).

The EpsiLine IWI System can easily be used to upgrade properties to current building regulations and is particularly suited to domestic refurbishment. It provides a reliable long term energy saving benefit for buildings and is ideal for properties where no cavity exists (solid wall). A highly effective internal solution, EpsiLineIWI is perfect for projects that have restricted external planning constraints.

 Technical Data

Product Ref Type Thickness (mm)* R-value (m²K/W) Weight (kg/m²)
IWB245 Reveal board 15 + 12.5 0.700 6.62
IWB545 Wall board 45 + 12.5 2.095 7.82
IWB595 Wall board 50 + 12.5 2.322 8.02
IWB645 Wall board 55 + 12.5 2.572 8.22
IWB695 Wall board 60 + 12.5 2.727 8.42
IWB745 Wall board 65 + 12.5 3.004 8.62
*12.5mm tapered edge plasterboard is laminated to the specified thickness of insulation


Physical Properties

Standard EpsiLine Board
Compressive strength* BS EN 826 ≥120kPa
Dimensional stability* BS EN 1604 DS(TH)8
Thermal conductivity* BS EN 12667 0.022 W/mK
Fire resistance BS EN 13501-1 Euroclass B-s1,d0

Guideline U-values

For guideline u-values, please refer to the printed version of this guide … [DOWNLOAD]

Specification Clause

The insulation shall be EpsiLine IWB[#] _____mm thick comprising a polyisocyanurate rigid foam insulation core with a thermal conductivity of 0.022 W/mK with aluminium foil/kraft paper facings on both sides bonded to a layer of tapered edge 12.5mm plasterboard. Epsiline Wallboards are CFC/HCFC free with zero ODP and low GWP and CE marking compliant to BS EN 13950. EpsiLine Wallboards are manufactured in accordance with BS EN13950 quality management system ISO 9001 and environmental management system ISO 14001. All products must be installed in accordance with instructions issued by Wetherby Building Systems Limited.