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Glazing U-value comparison

Compare exact named manufacturer builds. Lower Ug means less centre-glazing heat transfer; it is separate from whole-window Uw.

Select a published build

Examples and guidanceApplication

For example window, balustrade or floor; structural applications need specialist review.

What your choice means

For example window, balustrade or floor; structural applications need specialist review.

Examples and guidanceOrientation

Ordered layers start at the outside or stated reference face.

What your choice means

Ordered layers start at the outside or stated reference face.

Proposed construction — outside/reference face first
Examples and guidanceNamed performance reference

A reference replaces the construction. Historical published data is shown only for an unchanged supported build; confirm current supply and product evidence.

What your choice means

A reference replaces the construction. Historical published data is shown only for an unchanged supported build; confirm current supply and product evidence.

Layer 1: glass

Nominal overall thickness: 6mm (includes cavities). 6mm clear toughened

This adds nominal layer thicknesses; it does not establish safety class, structural capacity or manufacturing tolerances. Annealed, heat-strengthened and toughened laminates need the appropriate specified product/system.

Thermal result

Source lookup

No declared Ug is available for this draft. Choose an exact supported manufacturer reference or obtain current supplier data. Changing layer thickness, gas/fill, coating/product, treatment, finish or orientation invalidates the lookup.

Uw is unavailable here: it needs the complete window geometry, frame Uf and spacer-edge contribution. These values do not establish regulatory compliance or current supply.

Sources and scope

Compare another published assembly

Pilkington Optitherm S3 — 4 / 16Ar / 4 / 16Ar / 4: Ug 0.6 W/m²K

March 2020 exact vertical triple assembly; 90% argon in both cavities, faces 2 and 5; current DoP to confirm.

Sources and scope

Choose a valid rectangular supported build to compare centre-glazing heat flow. This steady-state illustration excludes frames, installation, solar gain and annual energy costs.

Draft stays in this browser session. Copy/export before closing it. This is an enquiry draft, not manufacturing or structural approval.

Continue in your business workspace

Keep drawings, layers, specialist notes, measurements, access surveys and all 0 schedule panels together for a quote or installation plan. Subscription access is checked when saving.