Thermal calculations are undertaken in accordance with EN and BS standards, and following guidance published by the BRE, CWCT, GGF and CAB:
BS EN ISO 13789 Thermal performance of buildings - Transmission heat loss coefficient - Calculation method
BS EN ISO 6946 Building components and building elements - Thermal resistance and thermal transmittance - Calculation method
BS EN ISO 10211-1 Thermal bridges in building construction - Heat flows and surface temperatures - Part 1: General calculation methods
BS EN ISO 10211-2 Thermal bridges in building construction - Calculation of heat flows and surface temperatures - Part 2: Linear thermal bridges
BS EN ISO 10077-1 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 1: Simplified method
BS EN ISO 10077-2 Thermal performance of windows, doors and shutters - Calculation of thermal transmittance - Part 2: Numerical method for frames
BS EN ISO 13370 Thermal performance of buildings - Heat transfer via the ground - Calculation methods
BS EN 673 Glass in building - Determination of thermal transmittance (U-value) - Calculation method
BS EN ISO 12631:2012 - Thermal performance of curtain walling. Calculation of thermal transmittance
BRE BR 443 Conventions for U-value calculations
BRE IP 5/98 Metal cladding: Assessing thermal performance
BRE IP 17/01 Assessing the effects of thermal bridging at junctions and around openings
BRE IP 10/02 Metal cladding: Assessing the thermal performance of built-up systems which use ‘Z’ spacers
CWCT Standard for specifying and assessing for heat transfer (the U-value)
CWCT Guide to good practice for assessing heat transfer and condensation risk for a curtain wall
CWCT Guide to good practice for assessing glazing frame U-values
GGF 2.2 Window and door system U-values: Provision of certified data
CAB Guide for assessment of the thermal performance of aluminium curtain wall framing
CAB A guide for assessment of the thermal performance of aluminium windows
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