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Declared lambda values - Read more >

5000 Class 0 testing - Read more >

Rainscreen cladding & RS5000 - Read more >

Thermal Bridging Models

Celotex is proud to present a comprehensive range of thermal bridging models featuring our industry leading PIR insulation products. This new tool gives you the information you need to understand the build-up required to prevent heat loss through a typical junction of elements or around openings. Typically heat loss through these elements can account for 15% of the total heat loss over an entire building.

U-value Calculator
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What are thermal bridges?

Thermal Bridges (cold bridges or heat bridges) occur because of breaks in the insulation at junctions and openings within a construction causing heat loss. As insulation standards continue to evolve, it has become increasingly critical to consider heat loss in these areas.

Why understand them?

It is important to not only understand the heat transmittance of the floor, walls and roof (U-values), but to realise that complete thermal efficiency extends beyond that through junctions and openings, equating to the Psi Value. Improved junction values can help eliminate the need for costly renewable energy sources and heat recovery systems. Minimising thermal bridges also reduces the risk of surface condensation forming and mould growth which has structural and health implications.

How can Celotex help me?

Celotex Thermal Bridging Models provide specific Psi values for Celotex PIR insulation across multiple applications which can then be used in SAP calculations. SAP is a calculation method for residential developments to work out the expected carbon emissions and fabric energy efficiency over the course of a year. Thermal Bridging consideration allows SAP assessors and commercial teams to value engineer other parts of the envelope to balance costs and enhance build performance.

Celotex now provide a comprehensive toolset for Celotex Members, with both the Celotex U-value calculator and thermal bridging models, helping you understand the insulation requirements to maximise the energy efficiency of your building, sealing the thermal performance envelope


Are they free and how can I access them?

The Celotex Thermal Bridging Models are totally free and downloadable from inside the Members Area. Simply signing up to the Celotex Members’ Area will give you access to this tool plus much much more.

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