Knauf Insulation launches next generation non-combustible Soffit Linerboard

By Knauf Insulation UK & Ireland
July 15, 2020

Knauf Insulation has enhanced its Soffit Linerboard range, achieving best-in-class thermal performance and adding rigidity to make installation even easier. The improved range will help customers meet the increasing demand for non-combustible insulation in car parks, stadiums and commercial units.

“Specifications for non-combustible soffit insulation are likely to increase as building regulations evolve further and soffit applications become a focus for fire safety” said Luke Davies, Rock Mineral Wool Product Manager, Knauf Insulation. “We’ve improved Soffit Linerboard to give customers the best possible solution to respond to this demand”.

Soffit Linerboard now has a lower thermal conductivity of just 0.034 W/mK – no Rock Mineral Wool soffit slab on the market achieves lower. It is also less susceptible to thermal bridging thanks to a new fixing method which uses tube washers in the corners of each slab instead of traditional all-steel fixings.

The entire installation process has been made easier as the new product recipe makes each slab more rigid. A new detailed installation guide has been created to accompany the new product, with clear and simple advice to installers for a wide range of applications and scenarios.

Soffit Linerboard is now available in thicknesses from 50 to 220mm, with an additional base layer available to meet build-up requirements. There are two options available – Standard and Extra – depending on the aesthetics and impact resistance required. Standard has a black glass veil facing, while Extra is bonded to an off-white cementitious particle board.

Like the majority of Knauf Insulation products, Soffit Linerboard has the best possible Euroclass A1 Reaction to Fire Classification, so it will not contribute to the development or spread of a fire should it occur. As a Rock Mineral Wool product, it offers excellent acoustic performance, naturally absorbing sound waves and converting them into heat energy. It is manufactured with ECOSE® Technology, Knauf Insulation’s unique bio-based binder which makes it robust and durable while being soft to touch, easy to handle and low in dust and VOCs.

For more information about Soffit Linerboard, visit