Glazing systems and specialty applications

Schematic moisture-entry concept; the illustrated break is exaggerated. Actual seal failure need not involve a visibly broken spacer.

IGU seal failure

Loss of one or more required edge-seal functions in an insulating glass unit, potentially allowing excessive moisture or gas exchange, fogging, contamination, displacement, or loss of durability.

Secondary IGU sealant — illustrated detail

Secondary IGU sealant

The outer edge-seal material in a dual-seal insulating glass unit, used to provide durability, adhesion, mechanical restraint, and, in structural glazing, a specifically designed structural function.

Four hybrid IGU spacer profiles

Spacer

The perimeter component that separates IGU lites and helps establish cavity width, edge-seal geometry, and often a reservoir or path for desiccant.

Primary IGU sealant — illustrated detail

Primary IGU sealant

The innermost edge-seal material in many dual-seal insulating glass units, commonly serving as the principal moisture- and gas-vapor barrier between spacer and glass.

Glass door with localized fittings

Frameless glazing

A broad description for glass installations with little or no visually dominant perimeter framing, often using clamps, channels, pivots, patch fittings, sealant joints, or point supports.

Insulating glass edge seal — illustrated detail

Insulating glass edge seal

The perimeter sealing system that joins the lites and spacer of an insulating glass unit and limits moisture or gas exchange while maintaining the cavity.

Butt-jointed glazing — illustrated detail

Butt-jointed glazing

A configuration in which adjacent glass edges meet at an open or sealant-filled joint without a conventional mullion directly covering that joint.

Point-supported glazing — illustrated detail

Point-supported glazing

A glazing system in which discrete fittings, bolts, clamps, or connectors support glass at localized points rather than continuously along conventional framed edges.

Structural silicone glazing — illustrated detail

Structural silicone glazing

A glazing method in which a qualified structural silicone sealant transfers specified loads between glass or panels and supporting framing.

Storefront with visible perimeter framing

Captured glazing

A glazing configuration in which framing, stops, caps, or other mechanical components retain the glass edge on two, three, or four sides.

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