# Qualum > Qualum is a Quebec-based supplier of high-performance aluminium building-envelope systems — windows, doors, interior partitions, curtain wall, and sun control — serving Canada, the US, Europe, Latin America, and the Middle East. We write as a supplier: how to select and specify our systems, read product data sheets, and match products to a project's climate and program. ## Insights (guides & explainers) - [When Does Window Selection Enter Project Planning? A Phase-by-Phase Guide](https://qualum.ca/blog/when-window-selection-enters-project-planning): When window and facade selection should happen in project planning — from concept and schematic design through design development, tender, and construction. - [Why Aluminium? Durability, Finishes, and Recyclability in the Building Envelope](https://qualum.ca/blog/why-aluminium-building-envelope-material): Why aluminium suits the building envelope — strength-to-weight, durable factory finishes, corrosion resistance, thermal breaks, and near-infinite recyclability. - [Curtain Wall vs. Window Wall: A Specifier's Guide for Mid-Rise Aluminium Projects](https://qualum.ca/blog/curtain-wall-vs-window-wall-mid-rise): Curtain wall vs window wall for mid-rise aluminium projects — how they differ in structure, thermal bridging, fire-stopping, cost, and best fit. ## Key pages - [Architects & specifiers](https://qualum.ca/architects): system selection and specification support. - [Developers](https://qualum.ca/developers): multi-residential and commercial project support. - [Company](https://qualum.ca/company): about Qualum. - [Contact](https://qualum.ca/contact): request specifications or a consultation.