Glazed Aluminum Curtain Wall AHA (Activity Hazard Analysis / Job Hazard Analysis)

Updated 2026-06-23

A Glazed Aluminum Curtain Wall AHA (Activity Hazard Analysis / Job Hazard Analysis) is the plan for the glazed aluminum curtain-wall system — the stick-built facade where an aluminum mullion grid is erected up the building and glass lites are field-glazed into it at height — and it focuses on the detail the group AHA leaves open: setting heavy glass into the frame on the face of the building. This AHA is about field-glazing at height.

Why glazed aluminum curtain wall needs its own AHA

A glazed aluminum curtain wall is the stick-system form of curtain wall: aluminum mullions and transoms are erected up the building to form a grid, and glass lites (and spandrel panels) are then glazed into that grid on the face, held by pressure plates and cover caps. Where the unitized system flies finished panels into place, the glazed aluminum stick system does the glazing in the field, at height, one lite at a time — and that is its defining hazard. Each glass lite is a heavy, sharp pane that has to be carried or hoisted out to the facade grid and set into the mullions at height, at the open building edge, then captured with pressure plates and caps. So the crew handles heavy sharp glass repeatedly at the building edge, sets it into an aluminum grid they've erected up the face, and torques on pressure plates — all the facade-height and glass hazards, concentrated in the field-glazing operation. The aluminum grid erection (field-fabricated sharp members up the face) and the pressure-plate capture round it out. So the defining hazards are the field-glazing of heavy lites at height and the aluminum grid erection at the building edge, with the glass-at-the-edge handling as the core risk. This is the curtain wall glazed by hand on the face of the building.

Breaking glazed aluminum curtain wall into steps

The steps follow the stick-system build:

• Confirm the mullion grid, lite sizes, and glazing details from the submittal
• Establish edge fall protection and facade access up the height
• Erect and anchor the aluminum mullion/transom grid
• Hoist or carry the glass lites out to the facade
• Set each lite into the grid at height (glass-at-edge control)
• Install pressure plates and cover caps to capture the glass
• Seal and verify the glazing and weatherseal

The hazards step by step

Field-glazing heavy lites at height

The defining hazard is setting glass into the grid on the face of the building — heavy sharp lites handled at the open edge, at height, repeatedly. Each lite must be moved out to the facade (carried or hoisted), lifted into position, and set into the mullion grid while the crew works at the building edge, so the operation combines heavy- sharp-glass handling with a fall exposure and a dropped-glass exposure to everyone below. The controls are glazing suction cups and handling equipment for the lites, cut protection, edge and personal fall protection for the crew setting glass at the edge, controlled handling so a lite isn't dropped off the building (falling glass onto the street/lower work is catastrophic), and setting the lite into the grid without racking or edge-loading it. Every lite set is a heavy sharp pane at the building edge — the field-glazing is the operation this AHA exists for.

Aluminum grid erection at the building edge

Before the glass, the aluminum mullion and transom grid is erected up the facade and anchored to the structure — so the framing work is at the building edge, with the aluminum members field-fabricated (sharp swarf and cut edges) and handled and set at height. The controls are edge fall protection for the framing crew, controlled handling of the long aluminum members at the edge (a dropped member falls down the building), cut protection for the sharp aluminum, and anchoring the grid to the engineered detail so it carries the glass. The grid is the sharp-aluminum hazard from the storefront framing, now at facade height.

Pressure-plate and cap capture

The glass is captured in the grid by pressure plates screwed to the mullions and covered by snap-on caps, so after setting each lite the crew torques on pressure plates at the edge — fastening work at height with the glass held in place until captured. The hazards are the glass being unsecured until the pressure plates are on (a set-but- uncaptured lite can shift or fall), and the fastening at the edge. Capture each lite promptly with its pressure plates before moving on, keep the lite supported until captured, and do the plate fastening with edge fall protection.

Falling objects, sealant, eye, and wind

Everything at the facade is over people below (protect the area below from dropped glass, tools, caps), the weatherseal sealants bring chemistry, glass and aluminum bring eye and cut hazards, and wind affects both glass handling and edge work at height.

A simple Glazed Aluminum Curtain Wall AHA structure

Where the glass and the edge are the same place

The defining hazard is a single overlap: the heavy sharp glass is set at the building edge, so the glass-handling hazard and the fall hazard occupy the same spot at the same time — a crew member holding a heavy lite while working at the open edge of a tall building. That's the crux of stick-system glazing, and the control is protecting the glazier at the edge completely: fall-protected, with the lite controlled by glazing equipment rather than fought by hand, the area below protected from a drop, and the lite captured with pressure plates before the crew moves on. The field-glazing at height is where every hazard of the glazed aluminum wall concentrates, and it's protected as one.

From the field: what actually goes wrong

The glazed-aluminum failures center on the lite at the edge. The fall: a glazier setting a lite into the grid at the open building edge without adequate fall protection, both hands on a heavy pane, no free hand to arrest a slip. The dropped-glass: a lite mishandled or an uncaptured pane that shifts and goes off the building, shattering on the street or lower work — a catastrophic falling-object event. And the uncaptured-lite one: glass set into the grid but not promptly captured with pressure plates, then it moves. All are the field-glazing-at-height operation, which is exactly what stick-system glazed aluminum curtain wall is. Protect the glazier at the edge, control every lite, and capture it before moving on.

The bottom line

A Glazed Aluminum Curtain Wall AHA is a field-glazing-at-height plan. The stick system erects an aluminum grid up the facade and glazes heavy sharp lites into it at the building edge, so the controls are edge and personal fall protection for the glazing and framing crews, glazing equipment and cut protection for the heavy lites, protection of the area below from dropped glass, and prompt pressure-plate capture of each lite before moving on. Respect that the glass is set heavy and sharp at the open edge of a tall building, and the glazed aluminum facade goes up safely.

Frequently asked questions

What's the defining hazard of a stick-system glazed aluminum curtain wall?

Field-glazing at height — setting heavy sharp glass lites into the mullion grid on the face of the building, at the open edge, one at a time. Each lite is a heavy sharp pane handled at the building edge with a fall exposure and a dropped-glass exposure to everyone below. Use glazing equipment and cut protection for the lites, edge and personal fall protection for the crew, protect the area below, and set each lite without racking or edge-loading it. Every lite set concentrates the glass and height hazards in one operation.

How is the glass held in the aluminum grid?

By pressure plates screwed to the mullions and covered by snap-on caps. After setting each lite, the crew torques on pressure plates to capture it — so until the plates are on, the lite is unsecured and can shift or fall. Support each lite until it's captured, install the pressure plates promptly before moving on, and do the fastening with edge fall protection.

Is the aluminum framing a hazard too?

Yes. The mullion and transom grid is erected up the facade and anchored to the structure, with the aluminum members field-fabricated (sharp swarf and cut edges) and handled at the building edge — a dropped member falls down the building. Provide edge fall protection for the framing crew, control the long members at the edge, wear cut protection for the sharp aluminum, and anchor the grid to the engineered detail so it carries the glass.

How is this different from the curtain wall group AHA?

The group AHA covers curtain wall broadly, including unitized systems flown up as finished panels. This one focuses on the glazed aluminum stick system, where the glass is field-glazed into an erected grid at height — so the defining hazard is setting heavy lites at the building edge rather than flying panels. If you're glazing glass into a mullion grid on the face, the field-glazing-at-height focus here is the fit.

Related AHAs and JHAs

• Curtain Wall and Glazed Assemblies AHA — the curtain-wall fundamentals
• Entrances Storefronts and Curtain Walls AHA — the facade-glazing family fundamentals
• Aluminum-Framed Storefronts AHA — the aluminum-framing-and-glass comparison
• Curtain Wall Installation JHA — the curtain-wall installation fundamentals

Written by Mustafa Tok, CSP, ASP, CHST — OSHA Authorized Outreach Trainer with 14+ years of international construction safety experience across federal, heavy civil, and industrial projects.