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Instafibre Ltd. Instafibre cavity wall insulation. Instafibre Rockwool cavity wall insulation. Product sheet 1

Certificate 95/3149

Instafibre Ltd. Instafibre cavity wall insulation. Instafibre Rockwool cavity wall insulation. Product sheet 1

Document Status



Core Supplement




Relates to a loose granulated rock mineral wool fibre material form, suitable for insulating external masonry walls up to 12m high, with nominal cavity widths of a minimum of 50 mm. Key factors assessed were thermal properties, water penetration, condensation, behaviour in relation to fire and durability.


Date of second issue: 12th September 2014, amended March 2019. Originally certificated on 19th October 1995.


Publisher History

The British Board of Agrément have been providing authoritative and independent information on the performance of building products for over 40 years. The certificates they produce contain data on durability, installation and compliance with Building Regulations.



NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.

IHS Markit

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