beglazing

Beglazing is the process of installing or replacing glazing in a building envelope, including windows, doors, skylights, and curtain-wall facades. The term covers the selection, fabrication, and fitting of glass units and related framing systems. In traditional construction beglazing often refers to placing glass into existing window frames, while in modern projects it also encompasses structural glazing and large-format glass facades.

Common components include glass panes, insulated glazing units (IGUs) with two or more panes separated by a spacer and gas fill, seals, frames (timber, aluminum, or uPVC), and hardware. Glazing options vary, with single, double, or triple glazing, low-emissivity coatings, tempered or laminated safety glass, and different spacer materials affecting thermal performance and acoustics.

The process typically involves assessing openings, selecting glass type and frame system, removing old glazing, preparing and cleaning substrates, installing the new unit, applying sealants or glazing beads, and performing weatherproofing and pressure tests for air and water tightness. Installation may occur in retrofit projects or new construction, and can include specialized systems such as structural glazing or unitized curtain walls.

Performance standards focus on energy efficiency and safety, including U-values, solar heat gain coefficient (SHGC), air leakage, condensation resistance, and local safety glazing requirements. Maintenance considerations include cleaning, periodic sealing or re-sealing, and inspection of frames and seals to prevent leaks and drafts. Beglazing decisions affect building comfort, energy use, and long-term durability, and are influenced by codes, climate, and budget.