Non-Com Exterior




NON-COM Exterior is a polymer resin fire retardant impregnation treatment fully in line with the National House Building Council (NHBC) standards for external timber cladding.

A commercially proven global brand, NON-COM Exterior is backed by extensive independent fire certification and more than 40 years of fire performance experience.

NON-COM Exterior fire retardant treated timbers for exterior or severe damp situations have a proven track record of reducing the growth of a fire and the effects of heat and smoke release to provide extra time for escape and damage limitation.

NON-COM Exterior is a Type 'EXT' fire treatment that is very durable and is compliant with European FR Durability Standard EN16755.

A wide range of timber species can be treated to either Euroclass B or C as defined within EN 13501-1 to provide Building Regulation compliance to meet project requirements.


A Fire Retardant Treatable Species list is available to download as a pdf.



We offer a RIBA accredited fire retardant CPD which provides guidances regarding selection and fire retardant treatment specification in line with current EU legislation. Visit our Specification Zone for more information.


Non-Com Exterior Product Credentials

Our downloadable Checklist shows you the benefits of Non-Com Exterior treatment.


Fully tested by Exova Warrington Fire Research with independent Euroclass Classification Reports for each timber species and timber thickness, for use with or without air gaps - EN 13501-1.

UK Wood Protection Association (WPA) approved status type EXT (leach resistant) fire retardant product for the protection of exterior timbers.

Quality accredited through the UK WPA Benchmark FR Certification scheme.


Timber is impregnated on all faces with no need to re-apply fire retardant protection throughout the life of the timber. Treatment is compliant with European FR Durability Standard EN16755.

NON-COM Exterior is applied in a stringently controlled, industrial vacuum pressure factory process at a specialist treatment centre - the only one of its type in the UK, operating with ISO 9001 and ISO 14001 accreditations.

End Use and Specification

Typical end uses for NON-COM Exterior treated material includes exterior cladding and exposed timber structures, cedar shingles and shakes and Yorkshire boarding material.

We offer specification clause documents that contain our recommended wording for the specification of NON-COM Exterior fire retardant treated timbers.

NON-COM Exterior is listed in NBS Plus and RIBA Product Selector.

For answers to frequently asked questions on NON-COM Exterior treatment please visit our FAQs.














Downloadable guides are available - select a link below for the relevant document.