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Buyer’s guide

Thermal Break vs Non-Thermal Break Aluminium Windows

What separates the inside and outside aluminium—and how that changes the questions to ask before specifying a window.

Follow the thermal path through the frame

Aluminium conducts heat readily. A thermal break places a lower-conductivity separator between interior and exterior aluminium parts to interrupt a continuous metal path. This concept does not establish the performance of any specific window.

Concept diagram comparing continuous aluminium and an insulating separator between aluminium frame sections.
Illustration only; not to scale, a product drawing or evidence for a specific series.
Selection checklist

Trace the frame, glazing and evidence

  1. What changes in the frame

    A non-thermally-broken metal frame can provide a continuous conductive path through the frame. In a thermally-broken frame, an insulating strip connects two aluminium sections. The strip, connection and profile arrangement must be confirmed from the selected system.

  2. Why the frame is only one part

    The glazing build-up, low-emissivity coating, gas fill, spacer, seals, frame geometry, size and installation all affect the whole-window result. Ask for ratings or test evidence for the exact window configuration, not a claim about the profile alone.

  3. When to compare options

    Start with the project climate, heating or cooling goals, condensation concerns, daylight and solar-control needs. Then compare complete assemblies against the target and available evidence. A thermal-break label by itself is not an energy rating.

Supplied product reference

A product sample cannot show the thermal break

The photographs identify the general product context only; series, configuration, installation and testing require separate confirmation.

Photographed open aluminium casement-window sample
Real sample from the supplied image library; frame section and tested performance are not identified.
Common questions

Questions about the frame and glazing

Does a thermal break prove a particular U-factor?

No. It describes a frame construction concept. A whole-window value must be supported by a documented rating or test for the relevant configuration.

Can the glass be chosen separately from the frame?

The parts must be compatible. Glass weight, thickness, edge support, spacer, seals and frame capacity should be reviewed together.

What should I request from a supplier?

Ask for the system drawing, glass build-up, applicable whole-product performance evidence and the exact size/configuration covered by it.

Technical references

General guidance; confirm current project requirements and selected product evidence.

U.S. Department of Energy: efficient fenestration purchasing guidance U.S. Department of Energy: window types and technologies
Start with your opening schedule

Start with the opening schedule.

Share dimensions, quantities, drawings and destination for a product-specific review of system, glass and hardware options.

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