Thermal and fire performance

Thermal performance

Trisomet® complies with the minimum requirements of the conservation of fuel and power sections of the Building Regulations for England and Wales (Part L2) and Scotland (Technical Handbook Section 6 Energy). The panel construction offers highly consistent insulation performance, and the site-formed junctions provide a practical and effective method of ensuring good thermal performance.

Thickness (mm) U-value (W/m2K)* Typical application
40 0.46 Unheated building
60 0.33 Min Part L requirement for wall
80 0.25 Min Part L requirement for roof
100 0.2 Enhanced
120 0.16 Enhanced
135 0.15 Enhanced


Fire Safety*

Figures computer modelled in accordance with EN ISO 10211 as stated in MCRMA Technical Note 14.

Trisomet® carries Grade EXT-B and EXT-A approval by the LPCB. Also fire resistance performance of 4 hours integrity and 22 mins insulation are achievable with 40mm and 60mm core panels and 30mins insulation for panels 80mm and above. These are attained using standard fixing and sealing methods (external side-lap stitched at maximum 300mm centres).

The panel achieves a Grade AA rating in accordance with BS 476-3, which tests for external surface spread of flame and fire penetration (AA is the best result achievable). The internal surface of the panel complies with Class ‘O’ in accordance with the Building Regulations when tested to BS 476 Parts 6 & 7 and also achieves a Class B s2 rating in accordance with EN 13501-1.

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