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External Upstand Insulation Board

ProTherm RockFace A2 Non-combustible


ProTherm RockFace A2 is a Non-combustible Upstand Insulation Board used to thermally insulate and protect upstands and external walls in inverted flat roofs, warm roofs and balconies. 

Manufactured from class A1 Non-combustible Stonewool factory laminated to a 6mm thick weather resistant high impact calcium silicate fibre cement facing board, ProTherm RockFace A2 will not develop smoke or promote flame spread, even when directly exposed to fire. ProTherm RockFace A2 repels and drains away water, completely drying out while maintaining its original physical properties. The calcium silicate fibre cement facing board is BBA certificated (BBA certificate No. 21/5983) and independently tested and classified as Category A for external use in accordance with EN 12467:2012. Available in a range of thicknesses, see declared performance table for available thickness. 

ProTherm RockFace A2 is not intended to provide a final architectural/aesthetic finish as the cementitious facing may vary in colour from batch to batch. To achieve a consistent aesthetic finish the facing board can be primed and decorated with an appropriate masonry paint or render finish. 

ProTherm RockFace A2 has a Zero Ozone Depletion Potential (ODP), a Global Warming Potential (GWP). 

Building Regulation Approved Document B volume 1 – dwellings and volume 2 – non-dwellings compliant solution for buildings over 18m high in England, Wales and Northern Ireland. 

Building Regulation Approved Document B volume 1 – dwellings and volume 2 – non-dwellings compliant solution for buildings 11m to 18m high in England, Wales and Northern Ireland. 

Technical Handbook – domestic Annex 2.C and Technical Handbook – non-domestic Annex 2.F compliant solution for buildings over 11m high in Scotland. 


Classified Euroclass A2-s1,d0 to BS EN13501-1:2108 by WarringtonFire under classification report no. 19808F dated 10 10 2019. 

ISO 9001@2008 Quality Management System, ISO 14001 :2004 Environmental Management System.

For installation instructions please see Product Data Sheet.

Description  Value
Board Width 1200mm*
Board Length 1000mm*
Board thickness including facing 26mm + (increments of 10mm)**
Board Weight m RF26, 11.4kg / RF56, 18kg/ RF106, 26.5kg/ RF136, 29.5kg
Core Stonewool non-combustible insulation
Facing Grey, 6mm weather resistant, high impact, calcium silicate fibre cement facing
Fire Performance Euroclass A2-s1,d0
Thermal Conductivity Core 0.038 W/mK
Thermal Conductivity Facing 0.30 W/mK

*smaller boards 1000mm x 600mm are available for thicknesses above 100mm
**other thickness’s are available from 20mm (Insulation) in increments of 10mm to suit your U-value requirements.

Fire Certificate

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