Knauf Earthwool Soffit Liner

A Rock mineral wool soffit liner manufactured to insulate underground car parks and the underside of concrete soffits. The Knauf Earthwool Soffit liner is Euroclass A1 non-combustible, the highest accreditation in terms of how the product reacts to fire. The soffit liner is the ideal solution to upgrade the thermal performance of existing floors without affecting the floor height.

*Always Refer Back To The Manufactures Specification Document

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A range of non-combustible products, available in a variety of surface finishes for the insulation of semi-exposed environments such as opensided car parks.

Earthwool Soffit LinerboardStandard* has a black tissue facing, providing a neat aesthetic finish. Earthwool Soffit Linerboard Extra has an impact-resistant cement particle board for use when a robust solution is required.


Earthwool Soffit Linerboards are odourless, rot proof, non-hygroscopic, do not sustain vermin and will not encourage the growth of fungi, mould or bacteria.


Earthwool Soffit Linerboard is used for the thermal and acoustic insulation of soffits in a wide range of both residential and non-residential buildings.

The Rock Mineral Wool element of Earthwool Soffit Linerboard is non-combustible which makes it ideal for the underlining of car parks and garages.

Earthwool Soffit Linerboard is available in various facing materials all of which are suitable for applications where it will be installed in exposed or semi-exposed environments.

Earthwool Soffit Linerboard Standard (unfaced) is used as a base layer when expanding the thickness of insulation needed.


Earthwool Soffit Linerboards are available with a variety of facings.

• Tough, puncture resistant black tissue facing
• Calcium silicate building board (6mm)
• Unfaced for use as a base layer

Alternate facings are available as a bespoke product upon request and subject to a minimum order quantity.


The rock mineral wool element of Earthwool Soffit Linerboards is manufactured in accordance with BS EN 13162, ISO 50001 Energy Management Systems, OHSAS 18001 Occupational Health and Safety Management Systems, ISO 14001 Environmental Management Systems and ISO 9001 Quality Management Systems, as certified by Bureau Veritas.


Contains no ozone-depleting substances or greenhouse gases. For further environmental information consult the relevant Environmental Product Declaration, available on our website. The Rock Mineral Wool element has a BRE generic Green Guide rating of A.

Vapour resistivity

Earthwool Soffit Linerboards offer negligible resistance to the passage of water vapour. The rock mineral wool element to all variants having a water vapour resistivity of 5.00MNs/g.m. The black tissue face to Soffit Linerboard Standard has a water vapour resistivity of 200 MNs/g.m.

Handling and storage

Earthwool Soffit Linerboards are easy to handle and install, and easily cut to size where necessary. They are supplied in polythene wrap which is designed for short term protectiononly. For longer term protection on site, the product should either be stored indoors, or under cover and off the ground.  Earthwool Soffit Linerboards should not be left permanently exposed to the elements.

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