From Heritage to High-Rise: The Four Applications Where VIG Outperforms Every Alternative

Vacuum insulated glass is a single technology with four distinct product expressions, each solving a different problem for a different Canadian market segment. Understanding which configuration applies to which application — and being able to articulate the relevant technical argument for each — is what separates a VIG supplier from a VIG specifier. This article maps each of VIG Horizon's four certified configurations to the Canadian applications where it outperforms every conventional alternative.

Application 1: Heritage and pre-1946 restoration

Configuration: 3TL+V+3T · 6.2mm total · U=0.58 W/m²K

The heritage glazing market is where VIG has no competition — not because it is marginally better than triple IGU, but because triple IGU is physically incompatible with pre-1946 frame pockets. A 3TL+V+3T panel at 6.2mm fits directly into the original frame rebate of virtually any pre-war Canadian sash window. The visual character of the window — appearance, reflectivity, glazing line depth — is preserved. Heritage boards see no reason to object.

Canadian contexts where this configuration is the only viable performance upgrade include Vieux-Montréal designated buildings, the Vieux-Québec UNESCO site, Ottawa's Centretown and Sandy Hill heritage districts, Toronto's Part IV and Part V designated residential stock (Cabbagetown, the Annex, Rosedale), Halifax's South End, and Victoria's James Bay. In each of these contexts, the alternative to VIG is continued single-pane glazing — which means the payback comparison is VIG versus a U=5.8 single pane, not VIG versus triple IGU. The payback period in that comparison is typically under eight years.

The supporting documentation for a heritage board submission — thermal performance data, SGCC compliance statement, CAN/CGSB 12.1-2022 confirmation, frame depth specification, visual appearance documentation — is included in every VIG Horizon heritage specification package, in English and French.

Application 2: Net-zero and Passive House construction

Configuration: 4TL+V+4T · 8.2mm total · U=0.40 W/m²K · TÜV Rheinland confirmed

The 4TL+V+4T configuration is VIG Horizon's most specified product and the primary answer to Canada's Step Code 5 and Passive House glazing requirements. U=0.40 W/m²K, confirmed by TÜV Rheinland (Report CN25TTIK-002, September 2025), positions this configuration below the 0.45 W/m²K threshold that Passive House energy models and Step Code 5 compliance calculations require.

Canadian Passive House clusters — in Victoria, Whistler, Ottawa's Greystone Village, and Montreal's Coopérative de solidarité — represent a growing segment of residential construction where glazing specifications are determined by PHPP modelling outputs rather than prescriptive code minimums. For these projects, the documentation matters as much as the number: the PHPP-compatible U-value data, the whole-window calculation methodology, and the independent test report number are all required inputs for certification submissions.

The weight advantage is also significant for net-zero construction: at 20 kg/m² versus triple IGU's 28 kg/m², the 4TL+V+4T configuration reduces structural loading throughout the building, with cascading savings in frame specifications, hardware, and — in mass timber or modular construction — the structural members supporting the window openings.

Application 3: Commercial and curtain wall

Configuration: 5TL+V+5T · 10.2mm total · U=0.44 W/m²K · Max 1900×2800mm

The commercial glazing market has historically been served by large-format conventional IGU — typically 28–36mm units for high-performance curtain wall applications. The 5TL+V+5T configuration at 10.2mm total and U=0.44 W/m²K offers comparable or better thermal performance at significantly reduced thickness and weight, with maximum panel sizes of 1900×2800mm covering most commercial curtain wall module dimensions.

For commercial projects pursuing LEED certification, the thermal performance of the building envelope — including glazing — contributes to the Energy and Atmosphere credit. A U=0.44 W/m²K glazing specification contributes meaningfully to the energy model that determines LEED points. VIG Horizon provides LEED documentation support, including embodied carbon and operational energy data, with commercial specification packages.

The Grant-Deneau Tower in Dayton, Ohio — a 1969 residential high-rise retrofitted with 4,000 m² of Leadus VIG — is the most directly relevant reference project for Canadian commercial retrofit applications. The building achieved Energy Star certification post-retrofit, demonstrating real-world curtain wall VIG performance at scale in a North American climate comparable to Toronto's or Ottawa's.

Application 4: High-rise structural glazing

Configuration: 6TL+V+6T · 12.2mm total · U=0.42 W/m²K · Max 1900×2800mm

For high-rise applications where glass structural integrity under wind load is the governing specification — rather than pure thermal performance — the 6TL+V+6T configuration provides the additional glass substrate thickness (6mm panes versus 4mm) that structural glazing engineers require. The thicker substrates increase resistance to wind-induced deflection and reduce the risk of stress fracture at the ceramic spacer contact points under dynamic loading.

Canadian high-rise contexts where this configuration applies include new commercial tower construction in Toronto's downtown core, Vancouver's West Georgia corridor, and Montreal's central business district — all markets where glazing specifications are developed by structural engineers and reviewed by municipal building departments for wind load compliance.

The Regent Hotel in Hong Kong — where 200 m² of Leadus VIG was installed in what stands as the world's largest single-pane VIG retrofit — demonstrates the large-format, high-specification end of what Leadus technology can deliver. For Canadian high-rise projects, this reference confirms that the manufacturing partner's capability at premium specification levels is proven.