A Fabric First Approach with Hi-therm

Fabric first factors in a number of aspects including designing out thermal bridging in buildings as much as possible.  Good specification of thermally-efficient materials and products in the design stage, will eliminate the risk of thermal bridging and help improve a buildings fabric efficiency. 

Traditional steel lintels can create a significant thermal bridge in homes due to the high thermal conductivity of steel, however, a lintel design which incorporates a thermal break will outperform and offer a much more efficient solution than a traditional steel lintel.

Hi-therm+ lintels from Keystone use a patented combination of a polymer isolater and galvanised steel. The polymer section provides a powerful thermal break in the lintel and significantly reduces its conductivity value, with a Psi value of between 0.03 & 0.06 W/m.k. 

https://keystonelintels.com/hi-therm-lintels/