Sifton Helio Building Fiberglass Window Case Study

High-Performance Fiberglass Windows for a Net-Zero Multifamily Project in London, Ontario

The Sifton Helio Building in London, Ontario, was designed as a mixed-use, multifamily residential building targeting net-zero energy performance. For a project with this level of energy ambition, the window system needed to do more than fill openings. It needed to support comfort, durability, airtightness, and long-term building envelope performance.

Inline Fiberglass supplied high-performance Series 325 Fixed and Casement fiberglass windows for the project, helping support the building’s thermal performance goals while maintaining clean architectural sightlines.

A Multifamily Building Designed Around Energy Efficiency

The Helio Building was planned with a clear performance objective: create a mixed-use residential building that could support net-zero energy targets. That kind of project places real demands on the building envelope. Windows must help limit heat loss, control air leakage, support indoor comfort, and perform reliably through seasonal temperature changes.

For architects, developers, and builders, the window specification is not only a design decision. It affects energy modelling, occupant comfort, mechanical load, durability, and long-term operating performance. Inline Fiberglass was selected to supply fiberglass window systems that could help meet those project demands.

Project Snapshot

Project: Sifton Properties’ Helio Building

Location: 1325 Riverbend Rd., London, Ontario

Building Type: Mixed-use multifamily residential

Developer: Sifton Properties

Architect: Diamond Schmitt Architects

Contractor: EllisDon Construction

Inline Product Used: Series 325 Fixed and Casement Fiberglass Windows

Project Goal: Support a high-performance building envelope for a mixed-use multifamily project targeting net-zero energy

The Challenge: Supporting a Tight Thermal Boundary

High-performance multifamily buildings depend on careful coordination between the envelope and the mechanical systems. If the window system allows too much heat loss, air movement, or frame movement, the mechanical system has to work harder to maintain comfort.

For the Helio Building, the window system needed to support:

Strong thermal performance
Reliable air sealing
Fixed and operable window configurations
Durable frame performance in Ontario weather
Clean exterior and interior design integration
Product support suitable for a larger commercial project

The goal was not simply to install windows. The goal was to help the building perform as designed.

The Solution: Series 325 Fixed and Casement Fiberglass Windows

Inline supplied Series 325 Fixed and Casement fiberglass windows for the Sifton Helio Building.

The Series 325 line is designed for projects that require a balance of strength, energy performance, durability, and design flexibility. Fixed units support larger glazed areas where maximizing daylight, views, and architectural expression is a priority, while casement units provide operable ventilation and occupant comfort where needed.

For a multifamily project, that combination gives the design team flexibility to specify windows based on room function, orientation, ventilation requirements, and building performance goals, while maintaining a consistent appearance and fiberglass frame platform throughout the development. The result is a coordinated window strategy that supports both the architectural vision of the building and the long-term performance expectations of residents and ownership.

Why Inline Fiberglass Made Sense for This Project

Fiberglass is a strong fit for high-performance residential and commercial projects because it supports long-term dimensional stability and thermal performance. For the Helio Building, Inline’s fiberglass windows helped support:

Thermal Comfort

Fiberglass frames help reduce unwanted heat transfer compared with more conductive window frame materials.

Envelope Stability

Fiberglass is dimensionally stable, which helps window systems maintain performance through temperature changes.

Clean Architectural Design

Series 325 Fixed and Casement windows provide a practical mix of fixed glass areas and operable ventilation.

Commercial Project Support

Inline supports larger project teams with product guidance, technical information, and window system options.

Sifton Helio Building Project Gallery

See how Series 325 Fixed and Casement windows were integrated throughout the Helio Building to support daylight, comfort, and long-term building performance.

Built for Developers, Architects, and Commercial Project Teams

The Sifton Helio Building shows how Inline products can support more than individual home upgrades. Inline fiberglass window systems can be used in multifamily, commercial, institutional, and high-performance projects where product reliability and building envelope performance matter.

Planning a Similar Project?

Whether your project involves fixed windows, casement windows, large openings, high-performance goals, or multifamily construction, our team can help you review product options and take the next step.

Questions About The Sifton Helio Building Project

Find clear answers to common questions about the Sifton Helio Building project case study

What windows were used in the Sifton Helio Building?

The Sifton Helio Building used Inline Fiberglass Series 325 Fixed and Casement windows.

Where is the Sifton Helio Building located?

The project is located at 1325 Riverbend Rd. in London, Ontario.

What type of building is the Sifton Helio Building?

The Helio Building is a mixed-use, multifamily residential building targeting net-zero energy performance.

Why are fiberglass windows a good fit for high-performance multifamily buildings?

Fiberglass windows are a strong fit for high-performance buildings because they support thermal performance, durability, and dimensional stability. These qualities can help the building envelope perform more reliably over time.

Can Inline support commercial or multifamily window projects?

Yes. Inline supports commercial, multifamily, architectural, and high-performance projects with fiberglass window and door products, technical information, and project support.

Can I request product specs for a similar project?

Yes. Architects, builders, developers, and commercial project teams can request product information, technical documents, and project support from Inline.

Start A Similar Project

Planning a multifamily, commercial, or high-performance building project? Inline Fiberglass can help you review product options, request specs, and take the next step toward a quote.

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