Knauf Insulation launches next generation non-combustible Soffit Linerboard

By Knauf Insulation UK & Ireland on July 15, 2020

Knauf Insulation has enhanced its Earthwool® 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 Earthwool® Soffit Linerboard to give customers the best possible solution to respond to this demand”.

Earthwool® 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.

Earthwool® 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, Earthwool® Soffit Linerboard has the best possible Euroclass A1 Reaction to Fire Classification rating, 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 Earthwool® Soffit Linerboard, visit