4mm Low-E Toughened (TGH) / 4mm Krypton cavity / 6mm Float
Request made-to-measure heritage double glazing combining 4mm Low-E Toughened (TGH) on the inside, a 4mm Krypton gas cavity and 6mm Float as Panel 2. This separate 14mm nominal sealed-unit make-up is available to discuss with a specialist supplier.
Exploded Sealed Unit Architecture
Heritage glazing with a 6mm float second pane
The 6mm float second-pane option creates a different overall unit thickness from the 3mm and 4mm float options. For replacement heritage double glazing, give the supplier the available rebate depth and existing glazing details rather than assuming the thicker make-up will fit.
For this 6mm Float product, the selected 4mm cavity and Krypton gas give an indicative U-value baseline of 1.9 W/m²K. Panel 1 is 4mm Low-E Toughened (TGH); Panel 2 is 6mm Float. The total nominal unit thickness is 14mm. Confirm your rebate depth, sightline, spacer colour and the declared thermal performance with the supplier before ordering.
Choosing 6mm Float for heritage double glazing does not establish planning or conservation permission. Your supplier should confirm the exact product, and any required appearance match or project approval must be checked separately.