LandVac heritage vacuum glazing is just 8.3 mm (4+0.3+4) — thin enough to slot into original window frames, including listed and historic buildings where bulky double glazing is not allowed. U-value 0.4 W/(m²·K), 39 dB noise reduction, condensation-free even at a 70℃ temperature difference. No demolition. No secondary glazing. No lost character.
Original windows carry the character of a building — and most of its heat loss. Every conventional fix trades away something you care about.
The thinner the unit, the more original frames it fits without modification.
At 8.3 mm, LandVac heritage glazing fits most original timber and steel frames with minor rebate adjustment — and a 6.3 mm slim build (3+0.3+3) is available for extra-tight profiles.
| Configuration | U-value W/(m²·K) | Visible light |
|---|---|---|
| Heritage slim: 4TL(S1.10)+0.3V+4T | 0.4 | 78% |
| Slim build: 3+0.3+3 (6.3 mm) | 0.5 | 80% |
| Typical double glazing (24 mm) | 1.4 – 2.8 | — |
Tempered safety glass both sides; vacuum interlayer 0.3 mm. Custom sizes and configurations available. Values are declared whole-unit U-values — see the centre-of-glass note under independent test reports.
From a Victorian villa in Dublin to a monumental town hall in Veere — LandVac heritage glazing has been retrofitted into original frames across 1,200+ projects.
Dutch homeowners hesitated between HR++ glazing and vacuum technology, so the installer arranged a visit to a completed LandVac project. The verdict was immediate: cold draughts gone, comfort up — the client switched to LandVac on the spot.
The institute's renovated office building has run on LandVac vacuum glazing for seven years — zero glass breakage, zero vacuum loss, zero performance degradation. The same technology now clads its new 2,600 m² zero-carbon headquarters.
In a region with temperature swings near 70℃, LandVac vacuum glazing serves as the core envelope material — helping the building achieve a verified 101% comprehensive energy-saving rate.
CSTB in France, IFT Rosenheim in Germany, SGCC in the US — plus EPD environmental declarations for green-building documentation. Independently issued reports, not manufacturer claims.
LandVac Titanium Vacuum Glass holds EPD certification valid in both China and the European Union, covering 10 core products across three glass families — with reports valid for 5 years.
For LEED, BREEAM and DGNB projects and whole-building LCA, the verified environmental data is ready to drop straight into your project documentation.
U-value note: 0.4 W/(m²·K) quoted across this page is the declared value for the heritage build; the IFT certificate’s 0.34 is the centre-of-glass result for the tested sample (ISO 19916-1), and CSTB’s 0.44–0.46 is the EN 673 Ug of the 8.5 mm witness samples.
Also available on request: toughened vacuum glazing impact-safety report, China Green Product certification and ISO 9001:2015 — full documentation ships with the free Retrofit Pack.
Everything you need to specify, quote and sell a vacuum-glazing retrofit — in one email. Sent within one business day.
Tell us where to send it. No spam — one email with the pack, and a reply if you have project questions.
Send Me the Retrofit PackPrefer chat? Use the WhatsApp button — we reply in working hours (GMT+8).
Send your window dimensions and photos — we confirm the right configuration and rebate depth.
We support sample panels and test-fit guidance before you commit to full production.
Glass is replaced inside the existing frames — sashes stay, joinery stays, character stays.
Warm, quiet, condensation-free windows — with the original look fully preserved.
The heritage build is 8.3 mm (4+0.3+4) and the slim build is 6.3 mm (3+0.3+3). Most timber and steel frames accept one of the two with minor rebate preparation. Send us your section drawings and we will confirm before you order.
Because the unit is nearly as thin as single glazing and leaves the external appearance unchanged, it is frequently accepted where double glazing is refused. Acceptance always rests with your local conservation authority — our heritage checklist covers the documentation they typically request.
LandVac units are tempered, sealed with a metal solder and getter-protected, with a design service life of 25+ years. The BIAD renovation project has run seven years in daily use with zero failures.
Yes — sample panels and small trial orders are available. Many installers run a first project on one window before scaling up.
Yes. We export crated, edge-protected units worldwide and support installers across Europe, North America and Oceania. Delivery terms are confirmed per project.
Fill this in and the pack lands in your inbox within one business day — along with an answer to any project question you leave below.
Grab the free Heritage Retrofit Pack — specs, test reports and verified European case studies in one email.
Get the Free Pack