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What is a thermal break in curtain wall systems and why is it important?
A thermal break is an insulating barrier placed between the interior and exterior aluminum profiles of a curtain wall framing member. It interrupts the continuous metal path that would otherwise conduct heat between inside and outside.
Why Thermal Breaks Matter
Without a thermal break, aluminum (a highly conductive metal) transfers heat rapidly, causing energy loss. A thermal break can reduce thermal transmittance (U-value) by 50–70%, significantly lowering heating and cooling costs.
Thermal breaks keep interior aluminum surfaces warmer in cold weather, preventing condensation that can damage finishes, promote mold growth, and reduce indoor air quality.
By maintaining more stable interior surface temperatures, thermal breaks reduce cold radiation near windows, improving occupant comfort.
Modern building energy standards (ASHRAE 90.1, EU Directive, GB standards) increasingly require thermally-broken systems for compliance.
How Thermal Breaks Work
Typically made from polyamide (nylon) strips with glass fiber reinforcement, thermal break strips are inserted between the interior and exterior aluminum extrusions. The profiles are then mechanically joined or extruded together, creating a structural composite that maintains strength while blocking heat flow.
FOWALL integrates thermal break technology across its curtain wall, window wall, and aluminum window systems. Combined with Low-E insulating glass, FOWALL's thermally-broken systems achieve U-values suitable for the most demanding energy codes in North America, Europe, and the Middle East.
Looking to improve your building's energy performance? Send your project requirements or contact us for thermally-broken system options.