The significance of Thermal Bridging, as a potentially major source of fabric heat losses, is increasingly understood. Improving the U-values for the main building fabric without accurately addressing the Thermal Bridging is no longer an option.
Types of Thermal Bridging
Thermal bridging for repeating thermal bridges such as timber studs and joists should be included in the elemental U-value calculation.
Thermal bridging for non repeating elements should be assessed in the whole building SBEM or SAP calculations. Buildings can follow Accredited or Enhanced Construction Details to limit the effects of thermal bridging or each thermal bridge can be assessed individually.
Linear thermal transmission losses, known as psi values can be found at junctions between elements such as floors and walls or corners.
Thermal point losses, known as chi values, occur at brackets or fixings that penetrate insulation layers in the construction. 
Linear loss Point loss
BuildDesk is able to offer U-value and thermal bridging analysis using 2D and 3D numerical analysis as recognised in BR 443 Conventions to U-value calculations (May 2006) to BS EN ISO 10211 using specialist modelling software products such as TRISCO. These Numerical Analysis techniques can be used for calculating the U-value of complex build ups or individual metal components that passes through the insulation layer.
Whether you’re looking for accurate U-value calculations for Rainscreen cladding solutions or brackets and rails or any other details just give us a call on 01656 869940. For advice and a quotation please send your enquiries to steve.channon@builddesk.co.uk
Useful links
Accredited Construction Details http://www.planningportal.gov.uk/england/professionals/en/1115314255826.html
Enhanced Construction Details
