Fire Resistant-Fire Resistant Properties Aircrete Products

Celcon Blocks do not burn and can be used to contain or prevent the spread of fire within a building. Up to a 4 hour fire resistance can be achieved with a regular 100mm thick block making them the perfect choice for protecting our colleagues and loved ones.

Aircrete Wall in Real Fires

Extensive use has proved their capability in real fires, not only as a fire-break wall, but also as protective cladding for other forms of construction, for example steel frames.

Celcon blocks are classified as non-combustible and have a class 0 surface spread of flame as described in the National Building Regulations.

Fire Resistance Periods

The figures given in the table below have been taken from the BRE Report, 'Guidelines for the construction of fire resisting structural elements' 1988, and from the ‘Rules of the Fire Offices’ Committee for the construction of Building Grades 1 and 2’, Appendix 1.

Table 1. Fire Resistance of H+H Celcon Aircrete Products

Minimum block thickness excluding finishes

Loadbearing wall

Non-loadbearing wall

up to

up to

Fire resistance (hrs)









Solar Range (mm)









Standard & Hi strength ranges (mm)









Aircrete Block in Cavity Wall Construction

If Celcon blocks are to be used in cavity-wall construction, either in new build or renovation work, the thicknesses shown below may be reduced; contact the Technical Services Department for further advice.

Designers may also use the pan-European document ENV1996-1-2:1995 (Eurocode 6: Part 1-2). The UK National Application Document to the voluntary European Standard draws attention to the potential use of ENV Eurocodes as an alternative approach to Building Regulations compliance. Details of the more favourable thicknesses of the ENV can be obtained from Celcon’s Technical Services Department.

This information has been sourced, reviewed and adapted from materials provided by H + H Celcon.

For more information on this source, please visit H + H Celcon.


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