Calculation Competency: Conventions and Standards for Thermal Bridging Calculations and Compliance w

Organisation profile

Xtratherm is an Irish manufacturer committed to supporting the construction industry in the delivery of Low and Zero Carbon buildings.

From design stage to the delivery of ‘A’ rated buildings, the construction professional can rely on the expertise and support of the Xtratherm team. It is through the interaction between manufacturers, designers, engineers, builders and energy assessors that together we can formulate strategies to ‘Close the Gap’ between design and actual performance on site.

Training aim

The course will present the parameters used to characterize the thermal bridging of given junctions - with the conventions and standards to calculate them - and the routes to comply with Part L.  

Learning objectives

What is thermal bridging?


 Key parameters used to quantified thermal bridging:

 - Thermal bridging factor: Y-value

 - Linear thermal transmittance: Psi-value 

 - Temperature factor: fRSI

 Part L 2011 compliance methods


 Conventions and standards to calculate Y, Psi and fRSI


 Competency schemes in Ireland and UK


 Softwares available


 Case study

Course outline

What is thermal bridging?

Part L 2011 compliance methods

Quantifying thermal bridging: The temperature factor: fRSI, Psi-value and Y-value

Conventions and standards

Case study: detached house


Trainer's profile

Mark Magennis

NSAI and BRE Approved Thermal Modeller

BBA-TIMSA U-value calculation and condensation risk analysis competency scheme certified


Danny Kearney and Phil Ward

BBA-TIMSA U-value calculation and condensation risk analysis competency scheme certified

NSAI BER assessors


Ray Madden

Architectural Technologist

NSAI BER assessor


Emmanuel Bourdin

B. Eng. Chem. Eng., M. Sc. Chemistry, Ph. D. Applied Physics

Course duration

45 minutes + Q&A

Who should attend

Engineers involved in BER assessment, thermal analysis and Energy management of buildings.


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