4mm Low-E Float / 4mm Krypton cavity / 3mm Float
Request made-to-measure heritage double glazing combining 4mm Low-E Float on the inside, a 4mm Krypton gas cavity and 3mm Float as Panel 2. This separate 11mm nominal sealed-unit make-up is available to discuss with a specialist supplier.
Exploded Sealed Unit Architecture
Heritage double glazing with a 3mm float pane
This 3mm float second-pane option is for a slim heritage double-glazing enquiry where rebate depth and the finished sealed-unit thickness need particular attention. Provide your existing glass size and frame details so the supplier can check the proposed replacement.
For this 3mm 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 Float; Panel 2 is 3mm Float. The total nominal unit thickness is 11mm. Confirm your rebate depth, sightline, spacer colour and the declared thermal performance with the supplier before ordering.
Choosing 3mm 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.