Soffit Linerboards
Structural Soffit Floors


If insulating below a structural floor, insulation can be fixed from below, allowing the floor to be insulated and finished in one process.

In timber frame soffits, insulation is friction-fitted between timber joists, using the whole depth of the joist as an insulation zone. This allows high levels of thermal and acoustic insulation performance.

Our rock mineral wool insulation solutions not only provide thermal and acoustic performance that would be required in a soffit, but are also non-combustible giving additional peace of mind.

Have you seen our newly released colour match fixings for Rocksilk® Soffit Linerboard? Ask your sales rep today for more information



Evaluate the risk of interstitial condensation in the structure with our online condensation tool and U-Value calculator.

Try our Online Condensation Risk Analysis Tool

Technical Support Team

For any U-value calculations for alternative construction build-ups, please contact our Technical Support Team on 01744 766666.

For written U-value calculations, please complete our contact form by clicking here, including details of your full through construction build-up and we will respond accordingly to meet your requirements.