U-Value calculations as per standard EN 6946 and in accordance with BR 443 conventions

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 aims to introduce BER assessors and designers to the conventions and standards to use for U-value calculations.

Learning objectives

 Definition of U-value and thermal resistance

Definition of parameters to be considered and used to calculate U-value:

 –            Thermal conductivity

 –            Emissivity

–             Ventilated and unventilated cavities

 –            Engineered jointing

Code of practice, Standards and conventions to calculate U-values:

–             BR 443

–             EN 6946

–             EN 13370

CE marking

Contribution of thermal bridges in U-values calculation

Examples and pitfalls

Competency scheme

Validation process at design stage and on site.

Course outline

Introduction to Xtratherm

–             What is a U-Value?

                –            Thermal resistance

                –            Thermal conductivity

–             Standards for U-values Calculations, Fabric Performance & Thermal Measurement

–             BR 443 conventions

               –             Cavity Walls

               –             Unventilated air spaces

               –             Timber frame structure

               –             Floors

               –             Solid party wall junctions

               –             Roofs

               –             Thermal bridging

–             U-value and BCAR – Certification & Assurance

Trainer's profile

Emmanuel Bourdin

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


Phil Ward

15 years in Xtratherm

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

NSAI BER assessor


Ray Madden

Architectural Technologist

NSAI BER assessor


Mark Magennis

20 years in Xtratherm

NSAI and BRE Approved Thermal Modeller

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

Course duration

45 minutes +Q&A

Who should attend

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