A thermal break is used to avoid cold bridging (where warm air from outside comes into contact with the cold surface of the door frame, causing condensation). All aluminium sliding patio doors will feature a thermal break — a material with low thermal conductivity, usually a plastic like polyamide, that separates the interior and exterior sides of the frames to prevent the cold temperatures outside reaching the internal surface of the doors while also preventing heat loss from inside to out.…
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Homebuilding & Renovating (Digital) - 1 Issue, July 2022