Thermal Calculations

Taylor Lane is committed to manufacturing a high-performance and environmentally friendly timber frame kit, creating an energy efficient building and home. Timber frame offers many unique advantages over traditional masonry and cavity construction, superior thermal performance is one such benefit. A Taylor Lane timber frame can achieve a U-value as low as 0.1 W/m2K and an average Y-value of 5%, a 3% improvement on the national standard.

What is a U-value?

Thermal performance is measured in terms of heat loss, in the UK construction industry this is normally expressed as a U-value. A U-value is determined by calculating the heat transfer through a building material or component. The better insulated a building is the lower the U-value will be. The units of measurement are W/m2K.

Why Choose a Taylor Lane timber frame?

It is far simpler to achieve a low u-value with timber frame than traditional build methods. A standard wall constructed using Taylor Lane timber frame would achieve a u-value of 0.19 W/m2K, we can go as low as 0.1 W/m2K. A traditional build would usually need a wider wall construction to achieve 0.19 W/m2K, a bigger cavity with more insulation, and would have a negative impact on room size.

What is Thermal Bridging?

A thermal bridge is part of the building construction which has a significantly higher heat transfer than the surrounding materials. Sometimes called a cold bridge, thermal bridging occurs in the building fabric where there is typically too little insulation, a break in insulation or where it has been penetrated by another material, enabling heat loss. Research has shown that thermal bridging can account for up to 30% of a home’s heat loss.

Thermal bridging is measured as a Y-value. This is calculated using the building’s linear thermal transmittance – its Psi-value (every junction on the building has a Psi-value), all of which are added together and divided by the area of the building, producing a Y-value. Taylor Lane’s average Y-value is around 5%; the national standard is 8%. The lower the Y-value, the less heat is lost.

Why do I need to understand U-value and Y-values?

The U-value and Y-value both contribute to the overall Standard Assessment Procedure (SAP) for energy rating of dwellings. A SAP rating is essential for producing a Predicted Energy Assessment (PEA) and an On-Construction Energy Performance Certificate (EPC). Building Regulations require a SAP calculation and Predicted EPC submission before work commences on a new build dwelling.

Taylor Lane’s in-house technical team combines decades of design and site experience with manufacturing expertise and industry knowledge, providing you with a reliable, trusted partner throughout the design and build process.


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