Reducing thermal bridging of a bolted connection - Part 2: Bushings and Washers

Following on our the review of stainless fasteners, this week we take a look at the considerations when using bushings and washers to optimise the performance of thermally broken structural connections.

We can supply custom bushings and washers from the same high-performance composite materials as HiLo Break X and TekTherm™ AK-FR to suit your project. Check out the photos below from a recent project where the designer specified thermally broken fastener accessories.

When used in combination with a thermal break plate, they can further reduce heat transfer across bolted connections.

Key considerations:

✅ Modelling suggests utilising bushings and washers made from thermal break materials can further reduce the heat transfer across a connection. Note specific project modelling would be required to verify the specific impact,

✅ When using HiLo Break X or TekTherm™ AK-FR washers, placing a standard galvanised or stainless washer on either side can protects against damage during torquing. These protective washers should have an outer diameter equal to or greater than the thermally broken washer.

✅ If bushings are included, ensure their outer diameter extends at least to the outer edge of the thermally broken washer for consistent performance.

✅ Thermally broken washers can be used on both the warm and cold side of the connection to maximise impact.

We continue to evaluate the impact of these accessories and will share updates as new data becomes available.

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