Thermal Bridging

Linear Thermal Bridges occur at junctions between building elements and around openings (windows & doors). This represents the possibility of heat loss at these points, based both in the type of materials used and how well they can be sealed or joined, and also the quality of the tradesman’s labour.  ‘What you see doesn’t matter’ is no longer the builder’s maxim, and the quality of the hidden’ building work around window frames, skirting boards, and service exits has become of prime importance.

The quantity that describes the heat loss associated with thermal bridging is linear thermal transmittance represented by the greek letter psi. This calculation is based on the rate of heat flow per degree per unit length of the bridge that is not accounted for in the u-values of the building elements which the bridge crosses. The overall sum of psi multiplied by the length, for all junctions, divided by the floor area gives the y value, a figure representing heat loss through linear junctions on a per square metre basis.

• Thermal Properties
• Thermal Mass
• Thermal Bridging
• Cylinders & Measured Heat Loss
• Dimensions
• Boilers & SEDBUK (Seasonal Efficiency Database of Boilers in the UK)
• Ventilation Systems & the Appendix Q database
• Solar Gains
• Insulation
• Space Heating Systems
• Water Heating Systems
• Low Carbon Power Souces
• Condensation & Dewpoint Analysis
• Heat Pumps